1/*	$NetBSD: umount.c,v 1.42 2008/07/20 01:20:23 lukem 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\
35 The Regents of the University of California.  All rights reserved.");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)umount.c	8.8 (Berkeley) 5/8/95";
41#else
42__RCSID("$NetBSD: umount.c,v 1.42 2008/07/20 01:20:23 lukem 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#ifndef SMALL
51#include <sys/socket.h>
52
53#include <netdb.h>
54#include <rpc/rpc.h>
55#include <rpc/pmap_clnt.h>
56#include <rpc/pmap_prot.h>
57#include <nfs/rpcv2.h>
58#endif /* !SMALL */
59
60#include <err.h>
61#include <fstab.h>
62#include <stdio.h>
63#include <stdlib.h>
64#include <string.h>
65#include <unistd.h>
66
67typedef enum { MNTANY, MNTON, MNTFROM } mntwhat;
68
69#ifndef SMALL
70#include "mountprog.h"
71
72static int	 fake, verbose;
73static char	*nfshost;
74static struct addrinfo *nfshost_ai = NULL;
75
76static int	 namematch(const struct addrinfo *);
77static int	 sacmp(const struct sockaddr *, const struct sockaddr *);
78static int	 xdr_dir(XDR *, char *);
79#endif /* !SMALL */
80
81static int	 fflag;
82static char	*getmntname(const char *, mntwhat, char **);
83static int	 umountfs(const char *, const char **, int);
84static void	 usage(void) __dead;
85
86int
87main(int argc, char *argv[])
88{
89	int ch, errs, all = 0, raw = 0;
90#ifndef SMALL
91	int mnts;
92	struct statvfs *mntbuf;
93	struct addrinfo hints;
94#endif /* SMALL */
95	const char **typelist = NULL;
96
97	/* Start disks transferring immediately. */
98	sync();
99
100#ifdef SMALL
101#define OPTS "fR"
102#else
103#define OPTS "AaFfh:Rt:v"
104#endif
105	while ((ch = getopt(argc, argv, OPTS)) != -1)
106		switch (ch) {
107		case 'f':
108			fflag = MNT_FORCE;
109			break;
110		case 'R':
111			raw = 1;
112			break;
113#ifndef SMALL
114		case 'A':
115		case 'a':
116			all = 1;
117			break;
118		case 'F':
119			fake = 1;
120			break;
121		case 'h':	/* -h implies -A. */
122			all = 1;
123			nfshost = optarg;
124			break;
125		case 't':
126			if (typelist != NULL)
127				errx(1, "only one -t option may be specified.");
128			typelist = makevfslist(optarg);
129			break;
130		case 'v':
131			verbose = 1;
132			break;
133#endif /* !SMALL */
134		default:
135			usage();
136			/* NOTREACHED */
137		}
138	argc -= optind;
139	argv += optind;
140
141	if ((argc == 0 && !all) || (argc != 0 && all) || (all && raw))
142		usage();
143
144#ifndef SMALL
145	/* -h implies "-t nfs" if no -t flag. */
146	if ((nfshost != NULL) && (typelist == NULL))
147		typelist = makevfslist("nfs");
148
149	if (nfshost != NULL) {
150		memset(&hints, 0, sizeof hints);
151		getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
152	}
153
154	errs = 0;
155	if (all) {
156		if ((mnts = getmntinfo(&mntbuf, ST_NOWAIT)) == 0) {
157			warn("getmntinfo");
158			errs = 1;
159		}
160		for (errs = 0, mnts--; mnts > 0; mnts--) {
161			if (checkvfsname(mntbuf[mnts].f_fstypename, typelist))
162				continue;
163			if (umountfs(mntbuf[mnts].f_mntonname, typelist,
164			             1) != 0)
165				errs = 1;
166		}
167	} else
168#endif /* !SMALL */
169		for (errs = 0; *argv != NULL; ++argv)
170			if (umountfs(*argv, typelist, raw) != 0)
171				errs = 1;
172	return errs;
173}
174
175static int
176umountfs(const char *name, const char **typelist, int raw)
177{
178#ifndef SMALL
179	enum clnt_stat clnt_stat;
180	struct timeval try;
181	CLIENT *clp;
182	char *hostp = NULL;
183	struct addrinfo *ai = NULL, hints;
184#endif /* !SMALL */
185	const char *mntpt;
186	char *type, rname[MAXPATHLEN];
187	mntwhat what;
188	struct stat sb;
189
190	if (raw) {
191		mntpt = name;
192	} else {
193
194		what = MNTANY;
195		if (realpath(name, rname) != NULL) {
196			name = rname;
197
198			if (stat(name, &sb) == 0) {
199				if (S_ISBLK(sb.st_mode))
200					what = MNTON;
201				else if (S_ISDIR(sb.st_mode))
202					what = MNTFROM;
203			}
204		}
205#ifdef SMALL
206		else {
207 			warn("%s", rname);
208 			return 1;
209		}
210#endif /* SMALL */
211		mntpt = name;
212
213		switch (what) {
214		case MNTON:
215			if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
216				warnx("%s: not currently mounted", name);
217				return (1);
218			}
219			break;
220		case MNTFROM:
221			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
222				warnx("%s: not currently mounted", mntpt);
223				return (1);
224			}
225			break;
226		default:
227			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
228				name = mntpt;
229				if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
230					warnx("%s: not currently mounted", name);
231					return 1;
232				}
233			}
234		}
235
236#ifndef SMALL
237		if (checkvfsname(type, typelist))
238			return 1;
239
240		(void)memset(&hints, 0, sizeof hints);
241		if (!strncmp(type, MOUNT_NFS,
242		    sizeof(((struct statvfs *)NULL)->f_fstypename))) {
243			char *delimp;
244			/* look for host:mountpoint */
245			if ((delimp = strrchr(name, ':')) != NULL) {
246				int len = delimp - name;
247				hostp = malloc(len + 1);
248				if (hostp == NULL)
249				    	return 1;
250				memcpy(hostp, name, len);
251				hostp[len] = 0;
252				name += len + 1;
253				getaddrinfo(hostp, NULL, &hints, &ai);
254			}
255		}
256
257		if (!namematch(ai))
258			return 1;
259#endif /* ! SMALL */
260	}
261
262#ifndef SMALL
263	if (verbose)
264		(void)printf("%s: unmount from %s\n", name, mntpt);
265	if (fake)
266		return 0;
267#endif /* ! SMALL */
268
269	if (unmount(mntpt, fflag) == -1) {
270		warn("%s", mntpt);
271		return 1;
272	}
273
274#ifndef SMALL
275	if (ai != NULL && !(fflag & MNT_FORCE)) {
276		clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, "udp");
277		if (clp  == NULL) {
278			clnt_pcreateerror("Cannot MNT PRC");
279			return 1;
280		}
281		clp->cl_auth = authsys_create_default();
282		try.tv_sec = 20;
283		try.tv_usec = 0;
284		clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, xdr_dir,
285		    __UNCONST(name), xdr_void, NULL, try);
286		if (clnt_stat != RPC_SUCCESS) {
287			clnt_perror(clp, "Bad MNT RPC");
288			return 1;
289		}
290		auth_destroy(clp->cl_auth);
291		clnt_destroy(clp);
292	}
293#endif /* ! SMALL */
294	return 0;
295}
296
297static char *
298getmntname(const char *name, mntwhat what, char **type)
299{
300	static struct statvfs *mntbuf;
301	static int mntsize;
302	int i;
303
304	if (mntbuf == NULL &&
305	    (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
306		warn("getmntinfo");
307		return (NULL);
308	}
309	for (i = mntsize - 1; i >= 0; i--) {
310		if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
311			if (type)
312				*type = mntbuf[i].f_fstypename;
313			return (mntbuf[i].f_mntonname);
314		}
315		if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
316			if (type)
317				*type = mntbuf[i].f_fstypename;
318			return (mntbuf[i].f_mntfromname);
319		}
320	}
321	return (NULL);
322}
323
324#ifndef SMALL
325static int
326sacmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
327{
328	const void *p1, *p2;
329	size_t len;
330
331	if (sa1->sa_family != sa2->sa_family)
332		return 1;
333
334	switch (sa1->sa_family) {
335	case AF_INET:
336		p1 = &((const struct sockaddr_in *)sa1)->sin_addr;
337		p2 = &((const struct sockaddr_in *)sa2)->sin_addr;
338		len = 4;
339		break;
340	case AF_INET6:
341		p1 = &((const struct sockaddr_in6 *)sa1)->sin6_addr;
342		p2 = &((const struct sockaddr_in6 *)sa2)->sin6_addr;
343		len = 16;
344		if (((const struct sockaddr_in6 *)sa1)->sin6_scope_id !=
345		    ((const struct sockaddr_in6 *)sa2)->sin6_scope_id)
346			return 1;
347		break;
348	default:
349		return 1;
350	}
351
352	return memcmp(p1, p2, len);
353}
354
355static int
356namematch(const struct addrinfo *ai)
357{
358	struct addrinfo *aip;
359
360	if (nfshost == NULL || nfshost_ai == NULL)
361		return (1);
362
363	while (ai != NULL) {
364		aip = nfshost_ai;
365		while (aip != NULL) {
366			if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
367				return 1;
368			aip = aip->ai_next;
369		}
370		ai = ai->ai_next;
371	}
372
373	return 0;
374}
375
376/*
377 * xdr routines for mount rpc's
378 */
379static int
380xdr_dir(XDR *xdrsp, char *dirp)
381{
382	return xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN);
383}
384#endif /* !SMALL */
385
386static void
387usage(void)
388{
389#ifdef SMALL
390	(void)fprintf(stderr,
391	    "Usage: %s [-fR]  special | node\n", getprogname());
392#else
393	(void)fprintf(stderr,
394	    "Usage: %s [-fvFR] [-t fstypelist] special | node\n"
395	    "\t %s -a[fvF] [-h host] [-t fstypelist]\n", getprogname(),
396	    getprogname());
397#endif /* SMALL */
398	exit(1);
399}
400