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umount.c revision 1.31 
      1 /*	$NetBSD: umount.c,v 1.31 2004/03/12 21:26:43 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 1.31 2004/03/12 21:26:43 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(char *, char **);
     72 char	*getmntname(const char *, mntwhat, char **);
     73 char	**makevfslist(char *);
     74 int	 main(int, char *[]);
     75 int	 namematch(const struct addrinfo *);
     76 int	 sacmp(const struct sockaddr *, const struct sockaddr *);
     77 int	 selected(int);
     78 int	 umountfs(char *, char **);
     79 void	 usage(void);
     80 int	 xdr_dir(XDR *, char *);
     81 
     82 int
     83 main(int argc, char *argv[])
     84 {
     85 	int all, ch, errs, mnts;
     86 	char **typelist = NULL;
     87 	struct statfs *mntbuf;
     88 	struct addrinfo hints;
     89 
     90 	/* Start disks transferring immediately. */
     91 	sync();
     92 
     93 	all = 0;
     94 	while ((ch = getopt(argc, argv, "AaFfRh:t:v")) != -1)
     95 		switch (ch) {
     96 		case 'A':
     97 		case 'a':
     98 			all = 1;
     99 			break;
    100 		case 'F':
    101 			fake = 1;
    102 			break;
    103 		case 'f':
    104 			fflag = MNT_FORCE;
    105 			break;
    106 		case 'h':	/* -h implies -A. */
    107 			all = 1;
    108 			nfshost = optarg;
    109 			break;
    110 		case 'R':
    111 			raw = 1;
    112 			break;
    113 		case 't':
    114 			if (typelist != NULL)
    115 				errx(1, "only one -t option may be specified.");
    116 			typelist = makevfslist(optarg);
    117 			break;
    118 		case 'v':
    119 			verbose = 1;
    120 			break;
    121 		default:
    122 			usage();
    123 			/* NOTREACHED */
    124 		}
    125 	argc -= optind;
    126 	argv += optind;
    127 
    128 	if ((argc == 0 && !all) || (argc != 0 && all) || (all && raw))
    129 		usage();
    130 
    131 	/* -h implies "-t nfs" if no -t flag. */
    132 	if ((nfshost != NULL) && (typelist == NULL))
    133 		typelist = makevfslist("nfs");
    134 
    135 	if (nfshost != NULL) {
    136 		memset(&hints, 0, sizeof hints);
    137 		getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
    138 	}
    139 
    140 	errs = 0;
    141 	if (all) {
    142 		if ((mnts = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
    143 			warn("getmntinfo");
    144 			errs = 1;
    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 	} else {
    153 		for (errs = 0; *argv != NULL; ++argv)
    154 			if (umountfs(*argv, typelist) != 0)
    155 				errs = 1;
    156 	}
    157 	exit(errs);
    158 }
    159 
    160 int
    161 umountfs(char *name, char **typelist)
    162 {
    163 	enum clnt_stat clnt_stat;
    164 	struct stat sb;
    165 	struct timeval try;
    166 	CLIENT *clp;
    167 	char *type, *delimp, *hostp, *mntpt, rname[MAXPATHLEN];
    168 	mntwhat what;
    169 	struct addrinfo *ai, hints;
    170 
    171 	delimp = NULL;
    172 
    173 	if (raw) {
    174 		mntpt = name;
    175 	} else {
    176 
    177 		what = MNTANY;
    178 		if (realpath(name, rname) != NULL) {
    179 			name = rname;
    180 
    181 			if (stat(name, &sb) == 0) {
    182 				if (S_ISBLK(sb.st_mode))
    183 					what = MNTON;
    184 				else if (S_ISDIR(sb.st_mode))
    185 					what = MNTFROM;
    186 			}
    187 		}
    188 		mntpt = name;
    189 
    190 		switch (what) {
    191 		case MNTON:
    192 			if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
    193 				warnx("%s: not currently mounted", name);
    194 				return (1);
    195 			}
    196 			break;
    197 		case MNTFROM:
    198 			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
    199 				warnx("%s: not currently mounted", mntpt);
    200 				return (1);
    201 			}
    202 			break;
    203 		default:
    204 			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
    205 				name = mntpt;
    206 				if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
    207 					warnx("%s: not currently mounted", name);
    208 					return (1);
    209 				}
    210 			}
    211 		}
    212 
    213 		if (checkvfsname(type, typelist))
    214 			return (1);
    215 
    216 		memset(&hints, 0, sizeof hints);
    217 		ai = NULL;
    218 		if (!strncmp(type, MOUNT_NFS, MFSNAMELEN)) {
    219 			/* look for host:mountpoint */
    220 			if ((delimp = strrchr(name, ':')) != NULL) {
    221 				*delimp = '\0';
    222 				hostp = name;
    223 				getaddrinfo(hostp, NULL, &hints, &ai);
    224 				name = delimp + 1;
    225 				*delimp = ':';
    226 			}
    227 		}
    228 
    229 		if (!namematch(ai))
    230 			return (1);
    231 	}
    232 
    233 	if (verbose)
    234 		(void)printf("%s: unmount from %s\n", name, mntpt);
    235 	if (fake)
    236 		return (0);
    237 
    238 	if (unmount(mntpt, fflag) < 0) {
    239 		warn("%s", mntpt);
    240 		return (1);
    241 	}
    242 
    243 	if (!raw && !strncmp(type, MOUNT_NFS, MFSNAMELEN) &&
    244 	    (ai != NULL) && !(fflag & MNT_FORCE)) {
    245 		*delimp = '\0';
    246 		clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, "udp");
    247 		if (clp  == NULL) {
    248 			clnt_pcreateerror("Cannot MNT PRC");
    249 			return (1);
    250 		}
    251 		clp->cl_auth = authsys_create_default();
    252 		try.tv_sec = 20;
    253 		try.tv_usec = 0;
    254 		clnt_stat = clnt_call(clp,
    255 		    RPCMNT_UMOUNT, xdr_dir, name, xdr_void, (caddr_t)0, try);
    256 		if (clnt_stat != RPC_SUCCESS) {
    257 			clnt_perror(clp, "Bad MNT RPC");
    258 			return (1);
    259 		}
    260 		auth_destroy(clp->cl_auth);
    261 		clnt_destroy(clp);
    262 	}
    263 	return (0);
    264 }
    265 
    266 char *
    267 getmntname(const char *name, mntwhat what, char **type)
    268 {
    269 	static struct statfs *mntbuf;
    270 	static int mntsize;
    271 	int i;
    272 
    273 	if (mntbuf == NULL &&
    274 	    (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
    275 		warn("getmntinfo");
    276 		return (NULL);
    277 	}
    278 	for (i = mntsize - 1; i >= 0; i--) {
    279 		if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
    280 			if (type)
    281 				*type = mntbuf[i].f_fstypename;
    282 			return (mntbuf[i].f_mntonname);
    283 		}
    284 		if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
    285 			if (type)
    286 				*type = mntbuf[i].f_fstypename;
    287 			return (mntbuf[i].f_mntfromname);
    288 		}
    289 	}
    290 	return (NULL);
    291 }
    292 
    293 int
    294 sacmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
    295 {
    296 	void *p1, *p2;
    297 	int len;
    298 
    299 	if (sa1->sa_family != sa2->sa_family)
    300 		return 1;
    301 
    302 	switch (sa1->sa_family) {
    303 	case AF_INET:
    304 		p1 = &((struct sockaddr_in *)sa1)->sin_addr;
    305 		p2 = &((struct sockaddr_in *)sa2)->sin_addr;
    306 		len = 4;
    307 		break;
    308 	case AF_INET6:
    309 		p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
    310 		p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
    311 		len = 16;
    312 		if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
    313 		    ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
    314 			return 1;
    315 		break;
    316 	default:
    317 		return 1;
    318 	}
    319 
    320 	return memcmp(p1, p2, len);
    321 }
    322 
    323 int
    324 namematch(const struct addrinfo *ai)
    325 {
    326 	struct addrinfo *aip;
    327 
    328 	if (nfshost == NULL || nfshost_ai == NULL)
    329 		return (1);
    330 
    331 	while (ai != NULL) {
    332 		aip = nfshost_ai;
    333 		while (aip != NULL) {
    334 			if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
    335 				return 1;
    336 			aip = aip->ai_next;
    337 		}
    338 		ai = ai->ai_next;
    339 	}
    340 
    341 	return 0;
    342 }
    343 
    344 /*
    345  * xdr routines for mount rpc's
    346  */
    347 int
    348 xdr_dir(XDR *xdrsp, char *dirp)
    349 {
    350 	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
    351 }
    352 
    353 void
    354 usage(void)
    355 {
    356 	(void)fprintf(stderr,
    357 	    "usage: %s\n       %s\n",
    358 	    "umount [-fvFR] [-t fstypelist] special | node",
    359 	    "umount -a[fvF] [-h host] [-t fstypelist]");
    360 	exit(1);
    361 }
    362