1/*	$NetBSD: mount_msdos.c,v 1.18 1997/09/16 12:24:18 lukem Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-4-Clause
5 *
6 * Copyright (c) 1994 Christopher G. Demetriou
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *      This product includes software developed by Christopher G. Demetriou.
20 * 4. The name of the author may not be used to endorse or promote products
21 *    derived from this software without specific prior written permission
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#ifndef lint
36static const char rcsid[] =
37  "$FreeBSD: stable/11/sbin/mount_msdosfs/mount_msdosfs.c 340953 2018-11-26 11:22:04Z eugen $";
38#endif /* not lint */
39
40#include <sys/param.h>
41#include <sys/mount.h>
42#include <sys/stat.h>
43#include <sys/iconv.h>
44#include <sys/linker.h>
45#include <sys/module.h>
46
47#include <ctype.h>
48#include <err.h>
49#include <errno.h>
50#include <grp.h>
51#include <locale.h>
52#include <pwd.h>
53#include <stdio.h>
54/* must be after stdio to declare fparseln */
55#include <libutil.h>
56#include <stdlib.h>
57#include <string.h>
58#include <sysexits.h>
59#include <unistd.h>
60
61#include "mntopts.h"
62
63static gid_t	a_gid(char *);
64static uid_t	a_uid(char *);
65static mode_t	a_mask(char *);
66static void	usage(void) __dead2;
67static int	set_charset(struct iovec **iov, int *iovlen, const char *, const char *);
68
69int
70main(int argc, char **argv)
71{
72	struct iovec *iov = NULL;
73	int iovlen = 0;
74	struct stat sb;
75	int c, set_gid, set_uid, set_mask, set_dirmask;
76	char *dev, *dir, mntpath[MAXPATHLEN], *csp;
77	char fstype[] = "msdosfs";
78	char errmsg[255] = {0};
79	char *cs_dos = NULL;
80	char *cs_local = NULL;
81	mode_t mask = 0, dirmask = 0;
82	uid_t uid = 0;
83	gid_t gid = 0;
84
85	set_gid = set_uid = set_mask = set_dirmask = 0;
86
87	while ((c = getopt(argc, argv, "sl9u:g:m:M:o:L:D:W:")) != -1) {
88		switch (c) {
89		case 's':
90			build_iovec(&iov, &iovlen, "shortnames", NULL, (size_t)-1);
91			break;
92		case 'l':
93			build_iovec(&iov, &iovlen, "longnames", NULL, (size_t)-1);
94			break;
95		case '9':
96			build_iovec_argf(&iov, &iovlen, "nowin95", "", (size_t)-1);
97			break;
98		case 'u':
99			uid = a_uid(optarg);
100			set_uid = 1;
101			break;
102		case 'g':
103			gid = a_gid(optarg);
104			set_gid = 1;
105			break;
106		case 'm':
107			mask = a_mask(optarg);
108			set_mask = 1;
109			break;
110		case 'M':
111			dirmask = a_mask(optarg);
112			set_dirmask = 1;
113			break;
114		case 'L': {
115			const char *quirk = NULL;
116			if (setlocale(LC_CTYPE, optarg) == NULL)
117				err(EX_CONFIG, "%s", optarg);
118			csp = strchr(optarg,'.');
119			if (!csp)
120				err(EX_CONFIG, "%s", optarg);
121			quirk = kiconv_quirkcs(csp + 1, KICONV_VENDOR_MICSFT);
122			build_iovec_argf(&iov, &iovlen, "cs_local", quirk);
123			cs_local = strdup(quirk);
124			}
125			break;
126		case 'D':
127			cs_dos = strdup(optarg);
128			build_iovec_argf(&iov, &iovlen, "cs_dos", cs_dos, (size_t)-1);
129			break;
130		case 'o': {
131			char *p = NULL;
132			char *val = strdup("");
133			p = strchr(optarg, '=');
134			if (p != NULL) {
135				free(val);
136				*p = '\0';
137				val = p + 1;
138			}
139			build_iovec(&iov, &iovlen, optarg, val, (size_t)-1);
140			}
141			break;
142		case 'W':
143			if (strcmp(optarg, "iso22dos") == 0) {
144				cs_local = strdup("ISO8859-2");
145				cs_dos = strdup("CP852");
146			} else if (strcmp(optarg, "iso72dos") == 0) {
147				cs_local = strdup("ISO8859-7");
148				cs_dos = strdup("CP737");
149			} else if (strcmp(optarg, "koi2dos") == 0) {
150				cs_local = strdup("KOI8-R");
151				cs_dos = strdup("CP866");
152			} else if (strcmp(optarg, "koi8u2dos") == 0) {
153				cs_local = strdup("KOI8-U");
154				cs_dos = strdup("CP866");
155			} else {
156				err(EX_NOINPUT, "%s", optarg);
157			}
158			build_iovec(&iov, &iovlen, "cs_local", cs_local, (size_t)-1);
159			build_iovec(&iov, &iovlen, "cs_dos", cs_dos, (size_t)-1);
160			break;
161		case '?':
162		default:
163			usage();
164			break;
165		}
166	}
167
168	if (optind + 2 != argc)
169		usage();
170
171	if (set_mask && !set_dirmask) {
172		dirmask = mask;
173		set_dirmask = 1;
174	}
175	else if (set_dirmask && !set_mask) {
176		mask = dirmask;
177		set_mask = 1;
178	}
179
180	dev = argv[optind];
181	dir = argv[optind + 1];
182
183	if (cs_local != NULL) {
184		if (set_charset(&iov, &iovlen, cs_local, cs_dos) == -1)
185			err(EX_OSERR, "msdosfs_iconv");
186		build_iovec_argf(&iov, &iovlen, "kiconv", "");
187	} else if (cs_dos != NULL) {
188		build_iovec_argf(&iov, &iovlen, "cs_local", "ISO8859-1");
189		if (set_charset(&iov, &iovlen, "ISO8859-1", cs_dos) == -1)
190			err(EX_OSERR, "msdosfs_iconv");
191		build_iovec_argf(&iov, &iovlen, "kiconv", "");
192	}
193
194	/*
195	 * Resolve the mountpoint with realpath(3) and remove unnecessary
196	 * slashes from the devicename if there are any.
197	 */
198	if (checkpath(dir, mntpath) != 0)
199		err(EX_USAGE, "%s", mntpath);
200	(void)rmslashes(dev, dev);
201
202	if (!set_gid || !set_uid || !set_mask) {
203		if (stat(mntpath, &sb) == -1)
204			err(EX_OSERR, "stat %s", mntpath);
205
206		if (!set_uid)
207			uid = sb.st_uid;
208		if (!set_gid)
209			gid = sb.st_gid;
210		if (!set_mask)
211			mask = dirmask =
212				sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
213	}
214
215	build_iovec(&iov, &iovlen, "fstype", fstype, (size_t)-1);
216	build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
217	build_iovec(&iov, &iovlen, "from", dev, (size_t)-1);
218	build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
219	build_iovec_argf(&iov, &iovlen, "uid", "%d", uid);
220	build_iovec_argf(&iov, &iovlen, "gid", "%u", gid);
221	build_iovec_argf(&iov, &iovlen, "mask", "%u", mask);
222	build_iovec_argf(&iov, &iovlen, "dirmask", "%u", dirmask);
223
224	if (nmount(iov, iovlen, 0) < 0) {
225		if (errmsg[0])
226			err(1, "%s: %s", dev, errmsg);
227		else
228			err(1, "%s", dev);
229	}
230
231	exit (0);
232}
233
234gid_t
235a_gid(char *s)
236{
237	struct group *gr;
238	char *gname;
239	gid_t gid;
240
241	if ((gr = getgrnam(s)) != NULL)
242		gid = gr->gr_gid;
243	else {
244		for (gname = s; *s && isdigit(*s); ++s);
245		if (!*s)
246			gid = atoi(gname);
247		else
248			errx(EX_NOUSER, "unknown group id: %s", gname);
249	}
250	return (gid);
251}
252
253uid_t
254a_uid(char *s)
255{
256	struct passwd *pw;
257	char *uname;
258	uid_t uid;
259
260	if ((pw = getpwnam(s)) != NULL)
261		uid = pw->pw_uid;
262	else {
263		for (uname = s; *s && isdigit(*s); ++s);
264		if (!*s)
265			uid = atoi(uname);
266		else
267			errx(EX_NOUSER, "unknown user id: %s", uname);
268	}
269	return (uid);
270}
271
272mode_t
273a_mask(char *s)
274{
275	int done, rv;
276	char *ep;
277
278	done = 0;
279	rv = -1;
280	if (*s >= '0' && *s <= '7') {
281		done = 1;
282		rv = strtol(optarg, &ep, 8);
283	}
284	if (!done || rv < 0 || *ep)
285		errx(EX_USAGE, "invalid file mode: %s", s);
286	return (rv);
287}
288
289void
290usage(void)
291{
292	fprintf(stderr, "%s\n%s\n%s\n",
293	"usage: mount_msdosfs [-9ls] [-D DOS_codepage] [-g gid] [-L locale]",
294	"                     [-M mask] [-m mask] [-o options] [-u uid]",
295	"		      [-W table] special node");
296	exit(EX_USAGE);
297}
298
299int
300set_charset(struct iovec **iov, int *iovlen, const char *cs_local, const char *cs_dos)
301{
302	int error;
303
304	if (modfind("msdosfs_iconv") < 0)
305		if (kldload("msdosfs_iconv") < 0 || modfind("msdosfs_iconv") < 0) {
306			warnx("cannot find or load \"msdosfs_iconv\" kernel module");
307			return (-1);
308		}
309
310	build_iovec_argf(iov, iovlen, "cs_win", ENCODING_UNICODE);
311	error = kiconv_add_xlat16_cspairs(ENCODING_UNICODE, cs_local);
312	if (error && errno != EEXIST)
313		return (-1);
314	if (cs_dos != NULL) {
315		error = kiconv_add_xlat16_cspairs(cs_dos, cs_local);
316		if (error && errno != EEXIST)
317			return (-1);
318	} else {
319		build_iovec_argf(iov, iovlen, "cs_dos", cs_local);
320		error = kiconv_add_xlat16_cspair(cs_local, cs_local,
321				KICONV_FROM_UPPER | KICONV_LOWER);
322		if (error && errno != EEXIST)
323			return (-1);
324	}
325
326	return (0);
327}
328