umount.c revision 1558 
1/*-
2 * Copyright (c) 1980, 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char copyright[] =
36"@(#) Copyright (c) 1980, 1989, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)umount.c	8.3 (Berkeley) 2/20/94";
42#endif /* not lint */
43
44#include <sys/param.h>
45#include <sys/stat.h>
46#include <sys/mount.h>
47#include <sys/time.h>
48#include <sys/socket.h>
49#include <sys/socketvar.h>
50
51#include <netdb.h>
52#include <rpc/rpc.h>
53#include <rpc/pmap_clnt.h>
54#include <rpc/pmap_prot.h>
55#include <nfs/rpcv2.h>
56
57#include <err.h>
58#include <fstab.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64typedef enum { MNTON, MNTFROM } mntwhat;
65
66int	fake, fflag, vflag, *typelist;
67char	*nfshost;
68
69int	 fsnametotype __P((char *));
70char	*getmntname __P((char *, mntwhat, int *));
71void	 maketypelist __P((char *));
72int	 selected __P((int));
73int	 namematch __P((struct hostent *));
74int	 umountall __P((void));
75int	 umountfs __P((char *));
76void	 usage __P((void));
77int	 xdr_dir __P((XDR *, char *));
78
79int
80main(argc, argv)
81	int argc;
82	char *argv[];
83{
84	int all, ch, errs;
85
86	/* Start disks transferring immediately. */
87	sync();
88
89	all = 0;
90	while ((ch = getopt(argc, argv, "aFfh:t:v")) != EOF)
91		switch (ch) {
92		case 'a':
93			all = 1;
94			break;
95		case 'F':
96			fake = 1;
97			break;
98		case 'f':
99			fflag = MNT_FORCE;
100			break;
101		case 'h':	/* -h implies -a. */
102			all = 1;
103			nfshost = optarg;
104			break;
105		case 't':
106			maketypelist(optarg);
107			break;
108		case 'v':
109			vflag = 1;
110			break;
111		default:
112			usage();
113			/* NOTREACHED */
114		}
115	argc -= optind;
116	argv += optind;
117
118	if (argc == 0 && !all || argc != 0 && all)
119		usage();
120
121	/* -h implies "-t nfs" if no -t flag. */
122	if ((nfshost != NULL) && (typelist == NULL))
123		maketypelist("nfs");
124
125	if (all) {
126		if (setfsent() == 0)
127			err(1, "%s", _PATH_FSTAB);
128		errs = umountall();
129	} else
130		for (errs = 0; *argv != NULL; ++argv)
131			if (umountfs(*argv) == 0)
132				errs = 1;
133	exit(errs);
134}
135
136int
137umountall()
138{
139	struct fstab *fs;
140	int rval, type;
141	char *cp;
142
143	while ((fs = getfsent()) != NULL) {
144		/* Ignore the root. */
145		if (strcmp(fs->fs_file, "/") == 0)
146			continue;
147		/*
148		 * !!!
149		 * Historic practice: ignore unknown FSTAB_* fields.
150		 */
151		if (strcmp(fs->fs_type, FSTAB_RW) &&
152		    strcmp(fs->fs_type, FSTAB_RO) &&
153		    strcmp(fs->fs_type, FSTAB_RQ))
154			continue;
155		/* If an unknown file system type, complain. */
156		if ((type = fsnametotype(fs->fs_vfstype)) == MOUNT_NONE) {
157			warnx("%s: unknown mount type", fs->fs_vfstype);
158			continue;
159		}
160		if (!selected(type))
161			continue;
162
163		/*
164		 * We want to unmount the file systems in the reverse order
165		 * that they were mounted.  So, we save off the file name
166		 * in some allocated memory, and then call recursively.
167		 */
168		if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
169			err(1, NULL);
170		(void)strcpy(cp, fs->fs_file);
171		rval = umountall();
172		return (umountfs(cp) || rval);
173	}
174	return (0);
175}
176
177int
178umountfs(name)
179	char *name;
180{
181	enum clnt_stat clnt_stat;
182	struct hostent *hp;
183	struct sockaddr_in saddr;
184	struct stat sb;
185	struct timeval pertry, try;
186	CLIENT *clp;
187	int so, type;
188	char *delimp, *hostp, *mntpt, rname[MAXPATHLEN];
189
190	if (realpath(name, rname) == NULL) {
191		warn("%s", rname);
192		return (0);
193	}
194
195	name = rname;
196
197	if (stat(name, &sb) < 0) {
198		if (((mntpt = getmntname(name, MNTFROM, &type)) == NULL) &&
199		    ((mntpt = getmntname(name, MNTON, &type)) == NULL)) {
200			warnx("%s: not currently mounted", name);
201			return (1);
202		}
203	} else if (S_ISBLK(sb.st_mode)) {
204		if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
205			warnx("%s: not currently mounted", name);
206			return (1);
207		}
208	} else if (S_ISDIR(sb.st_mode)) {
209		mntpt = name;
210		if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
211			warnx("%s: not currently mounted", mntpt);
212			return (1);
213		}
214	} else {
215		warnx("%s: not a directory or special device", name);
216		return (1);
217	}
218
219	if (!selected(type))
220		return (0);
221
222	if ((delimp = strchr(name, '@')) != NULL) {
223		hostp = delimp + 1;
224		*delimp = '\0';
225		hp = gethostbyname(hostp);
226		*delimp = '@';
227	} else if ((delimp = strchr(name, ':')) != NULL) {
228		*delimp = '\0';
229		hostp = name;
230		hp = gethostbyname(hostp);
231		name = delimp + 1;
232		*delimp = ':';
233	} else
234		hp = NULL;
235	if (!namematch(hp))
236		return (0);
237
238	if (vflag)
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 ((hp != NULL) && !(fflag & MNT_FORCE)) {
249		*delimp = '\0';
250		memset(&saddr, 0, sizeof(saddr));
251		saddr.sin_family = AF_INET;
252		saddr.sin_port = 0;
253		memmove(&saddr.sin_addr, hp->h_addr, hp->h_length);
254		pertry.tv_sec = 3;
255		pertry.tv_usec = 0;
256		so = RPC_ANYSOCK;
257		if ((clp = clntudp_create(&saddr,
258		    RPCPROG_MNT, RPCMNT_VER1, pertry, &so)) == NULL) {
259			clnt_pcreateerror("Cannot MNT PRC");
260			return (1);
261		}
262		clp->cl_auth = authunix_create_default();
263		try.tv_sec = 20;
264		try.tv_usec = 0;
265		clnt_stat = clnt_call(clp,
266		    RPCMNT_UMOUNT, xdr_dir, name, xdr_void, (caddr_t)0, try);
267		if (clnt_stat != RPC_SUCCESS) {
268			clnt_perror(clp, "Bad MNT RPC");
269			return (1);
270		}
271		auth_destroy(clp->cl_auth);
272		clnt_destroy(clp);
273	}
274	return (0);
275}
276
277char *
278getmntname(name, what, type)
279	char *name;
280	mntwhat what;
281	int *type;
282{
283	struct statfs *mntbuf;
284	int i, mntsize;
285
286	if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
287		warn("getmntinfo");
288		return (NULL);
289	}
290	for (i = 0; i < mntsize; i++) {
291		if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
292			if (type)
293				*type = mntbuf[i].f_type;
294			return (mntbuf[i].f_mntonname);
295		}
296		if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
297			if (type)
298				*type = mntbuf[i].f_type;
299			return (mntbuf[i].f_mntfromname);
300		}
301	}
302	return (NULL);
303}
304
305static enum { IN_LIST, NOT_IN_LIST } which;
306
307int
308selected(type)
309	int type;
310{
311	/* If no type specified, it's always selected. */
312	if (typelist == NULL)
313		return (1);
314	for (; *typelist != MOUNT_NONE; ++typelist)
315		if (type == *typelist)
316			return (which == IN_LIST ? 1 : 0);
317	return (which == IN_LIST ? 0 : 1);
318}
319
320void
321maketypelist(fslist)
322	char *fslist;
323{
324	int *av, i;
325	char *nextcp;
326
327	if ((fslist == NULL) || (fslist[0] == '\0'))
328		errx(1, "empty type list");
329
330	/*
331	 * XXX
332	 * Note: the syntax is "noxxx,yyy" for no xxx's and
333	 * no yyy's, not the more intuitive "noyyy,noyyy".
334	 */
335	if (fslist[0] == 'n' && fslist[1] == 'o') {
336		fslist += 2;
337		which = NOT_IN_LIST;
338	} else
339		which = IN_LIST;
340
341	/* Count the number of types. */
342	for (i = 0, nextcp = fslist; *nextcp != NULL; ++nextcp)
343		if (*nextcp == ',')
344			i++;
345
346	/* Build an array of that many types. */
347	if ((av = typelist = malloc((i + 2) * sizeof(int))) == NULL)
348		err(1, NULL);
349	for (i = 0; fslist != NULL; fslist = nextcp, ++i) {
350		if ((nextcp = strchr(fslist, ',')) != NULL)
351			*nextcp++ = '\0';
352		av[i] = fsnametotype(fslist);
353		if (av[i] == MOUNT_NONE)
354			errx(1, "%s: unknown mount type", fslist);
355	}
356	/* Terminate the array. */
357	av[i++] = MOUNT_NONE;
358}
359
360int
361fsnametotype(name)
362	char *name;
363{
364	static char const *namelist[] = INITMOUNTNAMES;
365	char const **cp;
366
367	for (cp = namelist; *cp; ++cp)
368		if (strcmp(name, *cp) == 0)
369			return (cp - namelist);
370	return (MOUNT_NONE);
371}
372
373int
374namematch(hp)
375	struct hostent *hp;
376{
377	char *cp, **np;
378
379	if ((hp == NULL) || (nfshost == NULL))
380		return (1);
381
382	if (strcasecmp(nfshost, hp->h_name) == 0)
383		return (1);
384
385	if ((cp = strchr(hp->h_name, '.')) != NULL) {
386		*cp = '\0';
387		if (strcasecmp(nfshost, hp->h_name) == 0)
388			return (1);
389	}
390	for (np = hp->h_aliases; *np; np++) {
391		if (strcasecmp(nfshost, *np) == 0)
392			return (1);
393		if ((cp = strchr(*np, '.')) != NULL) {
394			*cp = '\0';
395			if (strcasecmp(nfshost, *np) == 0)
396				return (1);
397		}
398	}
399	return (0);
400}
401
402/*
403 * xdr routines for mount rpc's
404 */
405int
406xdr_dir(xdrsp, dirp)
407	XDR *xdrsp;
408	char *dirp;
409{
410	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
411}
412
413void
414usage()
415{
416	(void)fprintf(stderr,
417	    "usage: %s\n       %s\n",
418	    "umount [-fv] [-t fstypelist] special | node",
419	    "umount -a[fv] [-h host] [-t fstypelist]");
420	exit(1);
421}
422