mount_msdosfs.c revision 330449 
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 330449 2018-03-05 07:26:05Z eadler $";
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 <grp.h>
50#include <locale.h>
51#include <pwd.h>
52#include <stdio.h>
53/* must be after stdio to declare fparseln */
54#include <libutil.h>
55#include <stdlib.h>
56#include <string.h>
57#include <sysexits.h>
58#include <unistd.h>
59
60#include "mntopts.h"
61
62static gid_t	a_gid(char *);
63static uid_t	a_uid(char *);
64static mode_t	a_mask(char *);
65static void	usage(void) __dead2;
66static int	set_charset(struct iovec **iov, int *iovlen, const char *, const char *);
67
68int
69main(int argc, char **argv)
70{
71	struct iovec *iov = NULL;
72	int iovlen = 0;
73	struct stat sb;
74	int c, set_gid, set_uid, set_mask, set_dirmask;
75	char *dev, *dir, mntpath[MAXPATHLEN], *csp;
76	char fstype[] = "msdosfs";
77	char errmsg[255] = {0};
78	char *cs_dos = NULL;
79	char *cs_local = NULL;
80	mode_t mask = 0, dirmask = 0;
81	uid_t uid = 0;
82	gid_t gid = 0;
83
84	set_gid = set_uid = set_mask = set_dirmask = 0;
85
86	while ((c = getopt(argc, argv, "sl9u:g:m:M:o:L:D:W:")) != -1) {
87		switch (c) {
88		case 's':
89			build_iovec(&iov, &iovlen, "shortnames", NULL, (size_t)-1);
90			break;
91		case 'l':
92			build_iovec(&iov, &iovlen, "longnames", NULL, (size_t)-1);
93			break;
94		case '9':
95			build_iovec_argf(&iov, &iovlen, "nowin95", "", (size_t)-1);
96			break;
97		case 'u':
98			uid = a_uid(optarg);
99			set_uid = 1;
100			break;
101		case 'g':
102			gid = a_gid(optarg);
103			set_gid = 1;
104			break;
105		case 'm':
106			mask = a_mask(optarg);
107			set_mask = 1;
108			break;
109		case 'M':
110			dirmask = a_mask(optarg);
111			set_dirmask = 1;
112			break;
113		case 'L': {
114			const char *quirk = NULL;
115			if (setlocale(LC_CTYPE, optarg) == NULL)
116				err(EX_CONFIG, "%s", optarg);
117			csp = strchr(optarg,'.');
118			if (!csp)
119				err(EX_CONFIG, "%s", optarg);
120			quirk = kiconv_quirkcs(csp + 1, KICONV_VENDOR_MICSFT);
121			build_iovec_argf(&iov, &iovlen, "cs_local", quirk);
122			cs_local = strdup(quirk);
123			}
124			break;
125		case 'D':
126			cs_dos = strdup(optarg);
127			build_iovec_argf(&iov, &iovlen, "cs_dos", cs_dos, (size_t)-1);
128			break;
129		case 'o': {
130			char *p = NULL;
131			char *val = strdup("");
132			p = strchr(optarg, '=');
133			if (p != NULL) {
134				free(val);
135				*p = '\0';
136				val = p + 1;
137			}
138			build_iovec(&iov, &iovlen, optarg, val, (size_t)-1);
139			}
140			break;
141		case 'W':
142			if (strcmp(optarg, "iso22dos") == 0) {
143				cs_local = strdup("ISO8859-2");
144				cs_dos = strdup("CP852");
145			} else if (strcmp(optarg, "iso72dos") == 0) {
146				cs_local = strdup("ISO8859-7");
147				cs_dos = strdup("CP737");
148			} else if (strcmp(optarg, "koi2dos") == 0) {
149				cs_local = strdup("KOI8-R");
150				cs_dos = strdup("CP866");
151			} else if (strcmp(optarg, "koi8u2dos") == 0) {
152				cs_local = strdup("KOI8-U");
153				cs_dos = strdup("CP866");
154			} else {
155				err(EX_NOINPUT, "%s", optarg);
156			}
157			build_iovec(&iov, &iovlen, "cs_local", cs_local, (size_t)-1);
158			build_iovec(&iov, &iovlen, "cs_dos", cs_dos, (size_t)-1);
159			break;
160		case '?':
161		default:
162			usage();
163			break;
164		}
165	}
166
167	if (optind + 2 != argc)
168		usage();
169
170	if (set_mask && !set_dirmask) {
171		dirmask = mask;
172		set_dirmask = 1;
173	}
174	else if (set_dirmask && !set_mask) {
175		mask = dirmask;
176		set_mask = 1;
177	}
178
179	dev = argv[optind];
180	dir = argv[optind + 1];
181
182	if (cs_local != NULL) {
183		if (set_charset(&iov, &iovlen, cs_local, cs_dos) == -1)
184			err(EX_OSERR, "msdosfs_iconv");
185		build_iovec_argf(&iov, &iovlen, "kiconv", "");
186	} else if (cs_dos != NULL) {
187		build_iovec_argf(&iov, &iovlen, "cs_local", "ISO8859-1");
188		if (set_charset(&iov, &iovlen, "ISO8859-1", cs_dos) == -1)
189			err(EX_OSERR, "msdosfs_iconv");
190		build_iovec_argf(&iov, &iovlen, "kiconv", "");
191	}
192
193	/*
194	 * Resolve the mountpoint with realpath(3) and remove unnecessary
195	 * slashes from the devicename if there are any.
196	 */
197	if (checkpath(dir, mntpath) != 0)
198		err(EX_USAGE, "%s", mntpath);
199	(void)rmslashes(dev, dev);
200
201	if (!set_gid || !set_uid || !set_mask) {
202		if (stat(mntpath, &sb) == -1)
203			err(EX_OSERR, "stat %s", mntpath);
204
205		if (!set_uid)
206			uid = sb.st_uid;
207		if (!set_gid)
208			gid = sb.st_gid;
209		if (!set_mask)
210			mask = dirmask =
211				sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
212	}
213
214	build_iovec(&iov, &iovlen, "fstype", fstype, (size_t)-1);
215	build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
216	build_iovec(&iov, &iovlen, "from", dev, (size_t)-1);
217	build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
218	build_iovec_argf(&iov, &iovlen, "uid", "%d", uid);
219	build_iovec_argf(&iov, &iovlen, "gid", "%u", gid);
220	build_iovec_argf(&iov, &iovlen, "mask", "%u", mask);
221	build_iovec_argf(&iov, &iovlen, "dirmask", "%u", dirmask);
222
223	if (nmount(iov, iovlen, 0) < 0) {
224		if (errmsg[0])
225			err(1, "%s: %s", dev, errmsg);
226		else
227			err(1, "%s", dev);
228	}
229
230	exit (0);
231}
232
233gid_t
234a_gid(char *s)
235{
236	struct group *gr;
237	char *gname;
238	gid_t gid;
239
240	if ((gr = getgrnam(s)) != NULL)
241		gid = gr->gr_gid;
242	else {
243		for (gname = s; *s && isdigit(*s); ++s);
244		if (!*s)
245			gid = atoi(gname);
246		else
247			errx(EX_NOUSER, "unknown group id: %s", gname);
248	}
249	return (gid);
250}
251
252uid_t
253a_uid(char *s)
254{
255	struct passwd *pw;
256	char *uname;
257	uid_t uid;
258
259	if ((pw = getpwnam(s)) != NULL)
260		uid = pw->pw_uid;
261	else {
262		for (uname = s; *s && isdigit(*s); ++s);
263		if (!*s)
264			uid = atoi(uname);
265		else
266			errx(EX_NOUSER, "unknown user id: %s", uname);
267	}
268	return (uid);
269}
270
271mode_t
272a_mask(char *s)
273{
274	int done, rv;
275	char *ep;
276
277	done = 0;
278	rv = -1;
279	if (*s >= '0' && *s <= '7') {
280		done = 1;
281		rv = strtol(optarg, &ep, 8);
282	}
283	if (!done || rv < 0 || *ep)
284		errx(EX_USAGE, "invalid file mode: %s", s);
285	return (rv);
286}
287
288void
289usage(void)
290{
291	fprintf(stderr, "%s\n%s\n%s\n",
292	"usage: mount_msdosfs [-9ls] [-D DOS_codepage] [-g gid] [-L locale]",
293	"                     [-M mask] [-m mask] [-o options] [-u uid]",
294	"		      [-W table] special node");
295	exit(EX_USAGE);
296}
297
298int
299set_charset(struct iovec **iov, int *iovlen, const char *cs_local, const char *cs_dos)
300{
301	int error;
302
303	if (modfind("msdosfs_iconv") < 0)
304		if (kldload("msdosfs_iconv") < 0 || modfind("msdosfs_iconv") < 0) {
305			warnx("cannot find or load \"msdosfs_iconv\" kernel module");
306			return (-1);
307		}
308
309	build_iovec_argf(iov, iovlen, "cs_win", ENCODING_UNICODE);
310	error = kiconv_add_xlat16_cspairs(ENCODING_UNICODE, cs_local);
311	if (error)
312		return (-1);
313	if (cs_dos != NULL) {
314		error = kiconv_add_xlat16_cspairs(cs_dos, cs_local);
315		if (error)
316			return (-1);
317	} else {
318		build_iovec_argf(iov, iovlen, "cs_dos", cs_local);
319		error = kiconv_add_xlat16_cspair(cs_local, cs_local,
320				KICONV_FROM_UPPER | KICONV_LOWER);
321		if (error)
322			return (-1);
323	}
324
325	return (0);
326}
327