1/*	$NetBSD: umount.c,v 1.53 2020/04/23 04:21:13 christos 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 1.53 2020/04/23 04:21:13 christos 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#include <nfs/nfsmount.h>
59#endif /* !SMALL */
60
61#include <err.h>
62#include <errno.h>
63#include <fstab.h>
64#include <stdio.h>
65#include <stdlib.h>
66#include <string.h>
67#include <unistd.h>
68#include <util.h>
69
70typedef enum { MNTANY, MNTON, MNTFROM } mntwhat;
71
72#ifndef SMALL
73#include "mountprog.h"
74
75static int	 fake, verbose;
76static char	*nfshost;
77static struct addrinfo *nfshost_ai = NULL;
78
79static int	 namematch(const struct addrinfo *);
80static int	 sacmp(const struct sockaddr *, const struct sockaddr *);
81static int	 xdr_dir(XDR *, char *);
82static const char *getmntproto(const char *);
83#endif /* !SMALL */
84
85static int	 fflag;
86static char	*getmntname(const char *, mntwhat, char **);
87static int	 umountfs(const char *, const char **, int);
88static void	 usage(void) __dead;
89
90int
91main(int argc, char *argv[])
92{
93	int ch, errs, all = 0, raw = 0;
94	char mntfromname[MAXPATHLEN];
95#ifndef SMALL
96	int mnts;
97	struct statvfs *mntbuf;
98	struct addrinfo hints;
99#endif /* SMALL */
100	const char **typelist = NULL;
101
102#ifdef SMALL
103#define OPTS "fR"
104#else
105#define OPTS "AaFfh:Rt:v"
106#endif
107	while ((ch = getopt(argc, argv, OPTS)) != -1)
108		switch (ch) {
109		case 'f':
110			fflag = MNT_FORCE;
111			break;
112		case 'R':
113			raw = 1;
114			break;
115#ifndef SMALL
116		case 'A':
117		case 'a':
118			all = 1;
119			break;
120		case 'F':
121			fake = 1;
122			break;
123		case 'h':	/* -h implies -A. */
124			all = 1;
125			nfshost = optarg;
126			break;
127		case 't':
128			if (typelist != NULL)
129				errx(1, "only one -t option may be specified.");
130			typelist = makevfslist(optarg);
131			break;
132		case 'v':
133			verbose = 1;
134			break;
135#endif /* !SMALL */
136		default:
137			usage();
138			/* NOTREACHED */
139		}
140	argc -= optind;
141	argv += optind;
142
143	if ((argc == 0 && !all) || (argc != 0 && all) || (all && raw))
144		usage();
145
146#ifndef SMALL
147	/* -h implies "-t nfs" if no -t flag. */
148	if ((nfshost != NULL) && (typelist == NULL))
149		typelist = makevfslist("nfs");
150
151	if (nfshost != NULL) {
152		memset(&hints, 0, sizeof hints);
153		if (getaddrinfo(nfshost, NULL, &hints, &nfshost_ai) != 0) {
154			nfshost_ai = NULL;
155		}
156	}
157
158	errs = 0;
159	if (all) {
160		if ((mnts = getmntinfo(&mntbuf, ST_NOWAIT)) == 0) {
161			warn("getmntinfo");
162			errs = 1;
163		}
164		for (errs = 0, mnts--; mnts > 0; mnts--) {
165			if (checkvfsname(mntbuf[mnts].f_fstypename, typelist))
166				continue;
167			if (umountfs(mntbuf[mnts].f_mntonname, typelist,
168			             1) != 0)
169				errs = 1;
170		}
171	} else
172#endif /* !SMALL */
173		for (errs = 0; *argv != NULL; ++argv) {
174			if (getfsspecname(mntfromname, sizeof(mntfromname),
175			    *argv) == NULL)
176				err(EXIT_FAILURE, "%s", mntfromname);
177			if (umountfs(mntfromname, typelist, raw) != 0)
178				errs = 1;
179		}
180	return errs;
181}
182
183static int
184umountfs(const char *name, const char **typelist, int raw)
185{
186#ifndef SMALL
187	enum clnt_stat clnt_stat;
188	struct timeval try;
189	CLIENT *clp;
190	char *hostp = NULL;
191	struct addrinfo *ai = NULL, hints;
192	const char *proto = NULL;
193#endif /* !SMALL */
194	const char *mntpt;
195	char *type, rname[MAXPATHLEN], umountprog[MAXPATHLEN];
196	mntwhat what;
197	struct stat sb;
198
199	if (raw) {
200		mntpt = name;
201	} else {
202
203		what = MNTANY;
204		if (realpath(name, rname) != NULL) {
205			name = rname;
206
207			if (stat(name, &sb) == 0) {
208				if (S_ISBLK(sb.st_mode))
209					what = MNTON;
210				else if (S_ISDIR(sb.st_mode))
211					what = MNTFROM;
212			}
213		}
214#ifdef SMALL
215		else {
216 			warn("%s", name);
217 			return 1;
218		}
219#endif /* SMALL */
220		mntpt = name;
221
222		switch (what) {
223		case MNTON:
224			if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
225				warnx("%s: not currently mounted", name);
226				return (1);
227			}
228			break;
229		case MNTFROM:
230			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
231				warnx("%s: not currently mounted", mntpt);
232				return (1);
233			}
234			break;
235		default:
236			if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
237				name = mntpt;
238				if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
239					warnx("%s: not currently mounted", name);
240					return 1;
241				}
242			}
243		}
244
245#ifndef SMALL
246		if (checkvfsname(type, typelist))
247			return 1;
248
249		(void)memset(&hints, 0, sizeof hints);
250		if (!strncmp(type, MOUNT_NFS,
251		    sizeof(((struct statvfs *)NULL)->f_fstypename))) {
252			char *delimp;
253			proto = getmntproto(mntpt);
254			/* look for host:mountpoint */
255			if ((delimp = strrchr(name, ':')) != NULL) {
256				int len = delimp - name;
257				hostp = malloc(len + 1);
258				if (hostp == NULL)
259				    	return 1;
260				memcpy(hostp, name, len);
261				hostp[len] = 0;
262				name += len + 1;
263				if (getaddrinfo(hostp, NULL, &hints, &ai) != 0)
264					ai = NULL;
265			}
266		}
267
268		if (!namematch(ai))
269			return 1;
270#endif /* ! SMALL */
271		snprintf(umountprog, sizeof(umountprog), "umount_%s", type);
272	}
273
274#ifndef SMALL
275	if (verbose) {
276		(void)printf("%s: unmount from %s\n", name, mntpt);
277		/* put this before the test of FAKE */
278		if (!raw) {
279			(void)printf("Trying unmount program %s\n",
280			    umountprog);
281		}
282	}
283	if (fake)
284		return 0;
285#endif /* ! SMALL */
286
287	if (!raw) {
288		/*
289		 * The only options that need to be passed on are -f
290		 * and -v.
291		 */
292		char *args[3];
293		unsigned nargs = 0;
294
295		args[nargs++] = umountprog;
296		if (fflag == MNT_FORCE) {
297			args[nargs++] = __UNCONST("-f");
298		}
299#ifndef SMALL
300		if (verbose) {
301			args[nargs++] = __UNCONST("-v");
302		}
303#endif
304		execvp(umountprog, args);
305		if (errno != ENOENT) {
306			warn("%s: execvp", umountprog);
307		}
308	}
309
310#ifndef SMALL
311	if (verbose)
312		(void)printf("(No separate unmount program.)\n");
313#endif
314
315	if (unmount(mntpt, fflag) == -1) {
316		warn("%s", mntpt);
317		return 1;
318	}
319
320#ifndef SMALL
321	if (ai != NULL && !(fflag & MNT_FORCE)) {
322		clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, proto);
323		if (clp  == NULL) {
324			clnt_pcreateerror("Cannot MNT PRC");
325			return 1;
326		}
327		clp->cl_auth = authsys_create_default();
328		try.tv_sec = 20;
329		try.tv_usec = 0;
330		clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, xdr_dir,
331		    __UNCONST(name), xdr_void, NULL, try);
332		if (clnt_stat != RPC_SUCCESS) {
333			clnt_perror(clp, "Bad MNT RPC");
334			return 1;
335		}
336		auth_destroy(clp->cl_auth);
337		clnt_destroy(clp);
338	}
339#endif /* ! SMALL */
340	return 0;
341}
342
343static char *
344getmntname(const char *name, mntwhat what, char **type)
345{
346	static struct statvfs *mntbuf;
347	static int mntsize;
348	static char mntfromname[MAXPATHLEN];
349	int i;
350
351	if (mntbuf == NULL &&
352	    (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
353		warn("getmntinfo");
354		return (NULL);
355	}
356	for (i = mntsize - 1; i >= 0; i--) {
357		if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
358			if (type)
359				*type = mntbuf[i].f_fstypename;
360			return (mntbuf[i].f_mntonname);
361		}
362		if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
363			if (type)
364				*type = mntbuf[i].f_fstypename;
365			if (getfsspecname(mntfromname, sizeof(mntfromname),
366			    mntbuf[i].f_mntfromname) == NULL)
367				err(EXIT_FAILURE, "%s", mntfromname);
368			return mntfromname;
369		}
370	}
371	return (NULL);
372}
373
374#ifndef SMALL
375static int
376sacmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
377{
378	const void *p1, *p2;
379	size_t len;
380
381	if (sa1->sa_family != sa2->sa_family)
382		return 1;
383
384	switch (sa1->sa_family) {
385	case AF_INET:
386		p1 = &((const struct sockaddr_in *)sa1)->sin_addr;
387		p2 = &((const struct sockaddr_in *)sa2)->sin_addr;
388		len = 4;
389		break;
390	case AF_INET6:
391		p1 = &((const struct sockaddr_in6 *)sa1)->sin6_addr;
392		p2 = &((const struct sockaddr_in6 *)sa2)->sin6_addr;
393		len = 16;
394		if (((const struct sockaddr_in6 *)sa1)->sin6_scope_id !=
395		    ((const struct sockaddr_in6 *)sa2)->sin6_scope_id)
396			return 1;
397		break;
398	default:
399		return 1;
400	}
401
402	return memcmp(p1, p2, len);
403}
404
405static int
406namematch(const struct addrinfo *ai)
407{
408	struct addrinfo *aip;
409
410	if (nfshost == NULL || nfshost_ai == NULL)
411		return (1);
412
413	while (ai != NULL) {
414		aip = nfshost_ai;
415		while (aip != NULL) {
416			if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
417				return 1;
418			aip = aip->ai_next;
419		}
420		ai = ai->ai_next;
421	}
422
423	return 0;
424}
425
426/*
427 * xdr routines for mount rpc's
428 */
429static int
430xdr_dir(XDR *xdrsp, char *dirp)
431{
432	return xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN);
433}
434
435static const char *
436getmntproto(const char *name)
437{
438	struct nfs_args nfsargs;
439	struct sockaddr_storage ss;
440
441	nfsargs.sotype = SOCK_DGRAM;
442	nfsargs.addr = (struct sockaddr *)&ss;
443	nfsargs.addrlen = sizeof(ss);
444	(void)mount("nfs", name, MNT_GETARGS, &nfsargs, sizeof(nfsargs));
445	return nfsargs.sotype == SOCK_STREAM ? "tcp" : "udp";
446}
447#endif /* !SMALL */
448
449static void
450usage(void)
451{
452#ifdef SMALL
453	(void)fprintf(stderr,
454	    "Usage: %s [-fR]  special | node\n", getprogname());
455#else
456	(void)fprintf(stderr,
457	    "Usage: %s [-fvFR] [-t fstypelist] special | node\n"
458	    "\t %s -a[fvF] [-h host] [-t fstypelist]\n", getprogname(),
459	    getprogname());
460#endif /* SMALL */
461	exit(1);
462}
463