xref: /openbsd/sbin/umount/umount.c (revision 78b63d65) 
1 /*	$OpenBSD: umount.c,v 1.12 2001/05/18 08:07:51 mickey Exp $	*/
2 /*	$NetBSD: umount.c,v 1.16 1996/05/11 14:13:55 mycroft Exp $	*/
3 
4 /*-
5  * Copyright (c) 1980, 1989, 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. All advertising materials mentioning features or use of this software
17  *    must display the following acknowledgement:
18  *	This product includes software developed by the University of
19  *	California, Berkeley and its contributors.
20  * 4. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  */
36 
37 #ifndef lint
38 static char copyright[] =
39 "@(#) Copyright (c) 1980, 1989, 1993\n\
40 	The Regents of the University of California.  All rights reserved.\n";
41 #endif /* not lint */
42 
43 #ifndef lint
44 #if 0
45 static char sccsid[] = "@(#)umount.c	8.3 (Berkeley) 2/20/94";
46 #else
47 static char rcsid[] = "$OpenBSD: umount.c,v 1.12 2001/05/18 08:07:51 mickey Exp $";
48 #endif
49 #endif /* not lint */
50 
51 #include <sys/param.h>
52 #include <sys/stat.h>
53 #include <sys/mount.h>
54 #include <sys/time.h>
55 #include <sys/socket.h>
56 #include <sys/socketvar.h>
57 
58 #include <netdb.h>
59 #include <rpc/rpc.h>
60 #include <rpc/pmap_clnt.h>
61 #include <rpc/pmap_prot.h>
62 #include <nfs/rpcv2.h>
63 
64 #include <err.h>
65 #include <fstab.h>
66 #include <stdio.h>
67 #include <stdlib.h>
68 #include <string.h>
69 #include <unistd.h>
70 
71 typedef enum { MNTON, MNTFROM } mntwhat;
72 
73 int	fake, fflag, verbose;
74 char	**typelist = NULL;
75 char	*nfshost;
76 
77 char	*getmntname __P((char *, mntwhat, char *));
78 void	 maketypelist __P((char *));
79 int	 selected __P((const char *));
80 int	 namematch __P((struct hostent *));
81 int	 umountall __P((void));
82 int	 umountfs __P((char *));
83 void	 usage __P((void));
84 int	 xdr_dir __P((XDR *, char *));
85 
86 int
87 main(argc, argv)
88 	int argc;
89 	char *argv[];
90 {
91 	int all, ch, errs;
92 
93 	/* Start disks transferring immediately. */
94 	sync();
95 
96 	all = 0;
97 	while ((ch = getopt(argc, argv, "aFfh:t:v")) != -1)
98 		switch (ch) {
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 't':
113 			if (typelist != NULL)
114 				errx(1, "only one -t option may be specified.");
115 			maketypelist(optarg);
116 			break;
117 		case 'v':
118 			verbose = 1;
119 			break;
120 		default:
121 			usage();
122 			/* NOTREACHED */
123 		}
124 	argc -= optind;
125 	argv += optind;
126 
127 	if ((argc == 0 && !all) || (argc != 0 && all))
128 		usage();
129 
130 	/* -h implies "-t nfs" if no -t flag. */
131 	if ((nfshost != NULL) && (typelist == NULL))
132 		maketypelist("nfs");
133 
134 	if (all)
135 		errs = umountall();
136 	else
137 		for (errs = 0; *argv != NULL; ++argv)
138 			if (umountfs(*argv) != 0)
139 				errs = 1;
140 	return (errs);
141 }
142 
143 int
144 umountall()
145 {
146 	struct statfs *fs;
147 	int n;
148 	int rval;
149 
150 	n = getmntinfo(&fs, MNT_NOWAIT);
151 	if (n == 0)
152 		err(1, NULL);
153 
154 	rval = 0;
155 	while (--n >= 0) {
156 		/* Ignore the root. */
157 		if (strncmp(fs[n].f_mntonname, "/", MNAMELEN) == 0)
158 			continue;
159 		if (!selected(fs[n].f_fstypename))
160 			continue;
161 		if (umountfs(fs[n].f_mntonname))
162 			rval = 1;
163 	}
164 	return (rval);
165 }
166 
167 int
168 umountfs(oname)
169 	char *oname;
170 {
171 	enum clnt_stat clnt_stat;
172 	struct hostent *hp;
173 	struct sockaddr_in saddr;
174 	struct stat sb;
175 	struct timeval pertry, try;
176 	CLIENT *clp;
177 	int so;
178 	char *delimp, *hostp, *mntpt;
179 	char *name, *newname, rname[MAXPATHLEN], type[MFSNAMELEN];
180 
181 	if (realpath(oname, rname) == NULL)
182 		mntpt = name = oname;
183 	else
184 		mntpt = name = rname;
185 	newname = NULL;
186 
187 	/* If we can stat the file, check to see if it is a device or non-dir */
188 	if (stat(name, &sb) == 0) {
189 	    if (S_ISBLK(sb.st_mode)) {
190 		if ((mntpt = getmntname(name, MNTON, type)) == NULL) {
191 			warnx("%s: not currently mounted", name);
192 			return (1);
193 		}
194 	    } else if (!S_ISDIR(sb.st_mode)) {
195 		warnx("%s: not a directory or special device", name);
196 		return (1);
197 	    }
198 	}
199 
200 	/*
201 	 * Look up the name in the mount table.
202 	 * 99.9% of the time the path in the kernel is the one
203 	 * realpath() returns but check the original just in case...
204 	 */
205 	if (!(newname = getmntname(name, MNTFROM, type)) &&
206 	    !(mntpt = getmntname(name, MNTON, type)) ) {
207 		mntpt = oname;
208 		if (!(newname = getmntname(oname, MNTFROM, type)) &&
209 		    !(mntpt = getmntname(oname, MNTON, type))) {
210 			warnx("%s: not currently mounted", oname);
211 			return (1);
212 		}
213 	}
214 	if (newname)
215 		name = newname;
216 
217 	if (!selected(type))
218 		return (1);
219 
220 	if (!strncmp(type, MOUNT_NFS, MFSNAMELEN)) {
221 		if ((delimp = strchr(name, '@')) != NULL) {
222 			hostp = delimp + 1;
223 			*delimp = '\0';
224 			hp = gethostbyname(hostp);
225 			*delimp = '@';
226 		} else if ((delimp = strchr(name, ':')) != NULL) {
227 			*delimp = '\0';
228 			hostp = name;
229 			hp = gethostbyname(hostp);
230 			name = delimp + 1;
231 			*delimp = ':';
232 		} else
233 			hp = NULL;
234 		if (!namematch(hp))
235 			return (1);
236 	}
237 
238 	if (verbose)
239 		(void)printf("%s: unmount from %s\n", name, mntpt);
240 	if (fake)
241 		return (0);
242 
243 	if (unmount(mntpt, fflag) < 0) {
244 		warn("%s", mntpt);
245 		return (1);
246 	}
247 
248 	if (!strncmp(type, MOUNT_NFS, MFSNAMELEN) &&
249 	    (hp != NULL) && !(fflag & MNT_FORCE)) {
250 		*delimp = '\0';
251 		memset(&saddr, 0, sizeof(saddr));
252 		saddr.sin_family = AF_INET;
253 		saddr.sin_port = 0;
254 		memmove(&saddr.sin_addr, hp->h_addr, hp->h_length);
255 		pertry.tv_sec = 3;
256 		pertry.tv_usec = 0;
257 		so = RPC_ANYSOCK;
258 		if ((clp = clntudp_create(&saddr,
259 		    RPCPROG_MNT, RPCMNT_VER1, pertry, &so)) == NULL) {
260 			clnt_pcreateerror("Cannot MNT PRC");
261 			return (1);
262 		}
263 		clp->cl_auth = authunix_create_default();
264 		try.tv_sec = 20;
265 		try.tv_usec = 0;
266 		clnt_stat = clnt_call(clp,
267 		    RPCMNT_UMOUNT, xdr_dir, name, xdr_void, (caddr_t)0, try);
268 		if (clnt_stat != RPC_SUCCESS) {
269 			clnt_perror(clp, "Bad MNT RPC");
270 			return (1);
271 		}
272 		auth_destroy(clp->cl_auth);
273 		clnt_destroy(clp);
274 	}
275 	return (0);
276 }
277 
278 char *
279 getmntname(name, what, type)
280 	char *name;
281 	mntwhat what;
282 	char *type;
283 {
284 	struct statfs *mntbuf;
285 	int i, mntsize;
286 
287 	if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
288 		warn("getmntinfo");
289 		return (NULL);
290 	}
291 	for (i = 0; i < mntsize; i++) {
292 		if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
293 			if (type)
294 				memcpy(type, mntbuf[i].f_fstypename,
295 				    sizeof(mntbuf[i].f_fstypename));
296 			return (mntbuf[i].f_mntonname);
297 		}
298 		if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
299 			if (type)
300 				memcpy(type, mntbuf[i].f_fstypename,
301 				    sizeof(mntbuf[i].f_fstypename));
302 			return (mntbuf[i].f_mntfromname);
303 		}
304 	}
305 	return (NULL);
306 }
307 
308 static enum { IN_LIST, NOT_IN_LIST } which;
309 
310 int
311 selected(type)
312 	const char *type;
313 {
314 	char **av;
315 
316 	/* If no type specified, it's always selected. */
317 	if (typelist == NULL)
318 		return (1);
319 	for (av = typelist; *av != NULL; ++av)
320 		if (!strncmp(type, *av, MFSNAMELEN))
321 			return (which == IN_LIST ? 1 : 0);
322 	return (which == IN_LIST ? 0 : 1);
323 }
324 
325 void
326 maketypelist(fslist)
327 	char *fslist;
328 {
329 	int i;
330 	char *nextcp, **av;
331 
332 	if ((fslist == NULL) || (fslist[0] == '\0'))
333 		errx(1, "empty type list");
334 
335 	/*
336 	 * XXX
337 	 * Note: the syntax is "noxxx,yyy" for no xxx's and
338 	 * no yyy's, not the more intuitive "noyyy,noyyy".
339 	 */
340 	if (fslist[0] == 'n' && fslist[1] == 'o') {
341 		fslist += 2;
342 		which = NOT_IN_LIST;
343 	} else
344 		which = IN_LIST;
345 
346 	/* Count the number of types. */
347 	for (i = 1, nextcp = fslist; (nextcp = strchr(nextcp, ',')); i++)
348 		++nextcp;
349 
350 	/* Build an array of that many types. */
351 	if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL)
352 		err(1, NULL);
353 	av[0] = fslist;
354 	for (i = 1, nextcp = fslist; (nextcp = strchr(nextcp, ',')); i++) {
355 		*nextcp = '\0';
356 		av[i] = ++nextcp;
357 	}
358 	/* Terminate the array. */
359 	av[i] = NULL;
360 }
361 
362 int
363 namematch(hp)
364 	struct hostent *hp;
365 {
366 	char *cp, **np;
367 
368 	if ((hp == NULL) || (nfshost == NULL))
369 		return (1);
370 
371 	if (strcasecmp(nfshost, hp->h_name) == 0)
372 		return (1);
373 
374 	if ((cp = strchr(hp->h_name, '.')) != NULL) {
375 		*cp = '\0';
376 		if (strcasecmp(nfshost, hp->h_name) == 0)
377 			return (1);
378 	}
379 	for (np = hp->h_aliases; *np; np++) {
380 		if (strcasecmp(nfshost, *np) == 0)
381 			return (1);
382 		if ((cp = strchr(*np, '.')) != NULL) {
383 			*cp = '\0';
384 			if (strcasecmp(nfshost, *np) == 0)
385 				return (1);
386 		}
387 	}
388 	return (0);
389 }
390 
391 /*
392  * xdr routines for mount rpc's
393  */
394 int
395 xdr_dir(xdrsp, dirp)
396 	XDR *xdrsp;
397 	char *dirp;
398 {
399 	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
400 }
401 
402 void
403 usage()
404 {
405 	(void)fprintf(stderr,
406 	    "usage: %s\n       %s\n",
407 	    "umount [-fv] [-t fstypelist] special | node",
408 	    "umount -a[fv] [-h host] [-t fstypelist]");
409 	exit(1);
410 }
411