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#include <sys/param.h>
36#include <sys/mount.h>
37#include <sys/stat.h>
38#include <sys/iconv.h>
39#include <sys/linker.h>
40#include <sys/module.h>
41
42#include <ctype.h>
43#include <err.h>
44#include <errno.h>
45#include <grp.h>
46#include <locale.h>
47#include <pwd.h>
48#include <stdio.h>
49/* must be after stdio to declare fparseln */
50#include <libutil.h>
51#include <stdlib.h>
52#include <string.h>
53#include <sysexits.h>
54#include <unistd.h>
55
56#include "mntopts.h"
57
58static gid_t	a_gid(char *);
59static uid_t	a_uid(char *);
60static mode_t	a_mask(char *);
61static void	usage(void) __dead2;
62static int	set_charset(struct iovec **iov, int *iovlen, const char *, const char *);
63
64int
65main(int argc, char **argv)
66{
67	struct iovec *iov = NULL;
68	int iovlen = 0;
69	struct stat sb;
70	int c, set_gid, set_uid, set_mask, set_dirmask;
71	char *dev, *dir, mntpath[MAXPATHLEN], *csp;
72	char fstype[] = "msdosfs";
73	char errmsg[255] = {0};
74	char *cs_dos = NULL;
75	char *cs_local = NULL;
76	mode_t mask = 0, dirmask = 0;
77	uid_t uid = 0;
78	gid_t gid = 0;
79
80	set_gid = set_uid = set_mask = set_dirmask = 0;
81
82	while ((c = getopt(argc, argv, "sl9u:g:m:M:o:L:D:W:")) != -1) {
83		switch (c) {
84		case 's':
85			build_iovec(&iov, &iovlen, "shortnames", NULL, (size_t)-1);
86			break;
87		case 'l':
88			build_iovec(&iov, &iovlen, "longnames", NULL, (size_t)-1);
89			break;
90		case '9':
91			build_iovec_argf(&iov, &iovlen, "nowin95", "", (size_t)-1);
92			break;
93		case 'u':
94			uid = a_uid(optarg);
95			set_uid = 1;
96			break;
97		case 'g':
98			gid = a_gid(optarg);
99			set_gid = 1;
100			break;
101		case 'm':
102			mask = a_mask(optarg);
103			set_mask = 1;
104			break;
105		case 'M':
106			dirmask = a_mask(optarg);
107			set_dirmask = 1;
108			break;
109		case 'L': {
110			const char *quirk = NULL;
111			if (setlocale(LC_CTYPE, optarg) == NULL)
112				err(EX_CONFIG, "%s", optarg);
113			csp = strchr(optarg,'.');
114			if (!csp)
115				err(EX_CONFIG, "%s", optarg);
116			quirk = kiconv_quirkcs(csp + 1, KICONV_VENDOR_MICSFT);
117			build_iovec_argf(&iov, &iovlen, "cs_local", quirk);
118			cs_local = strdup(quirk);
119			}
120			break;
121		case 'D':
122			cs_dos = strdup(optarg);
123			build_iovec_argf(&iov, &iovlen, "cs_dos", cs_dos, (size_t)-1);
124			break;
125		case 'o': {
126			char *p = NULL;
127			char *val = strdup("");
128			p = strchr(optarg, '=');
129			if (p != NULL) {
130				free(val);
131				*p = '\0';
132				val = p + 1;
133			}
134			build_iovec(&iov, &iovlen, optarg, val, (size_t)-1);
135			}
136			break;
137		case 'W':
138			if (strcmp(optarg, "iso22dos") == 0) {
139				cs_local = strdup("ISO8859-2");
140				cs_dos = strdup("CP852");
141			} else if (strcmp(optarg, "iso72dos") == 0) {
142				cs_local = strdup("ISO8859-7");
143				cs_dos = strdup("CP737");
144			} else if (strcmp(optarg, "koi2dos") == 0) {
145				cs_local = strdup("KOI8-R");
146				cs_dos = strdup("CP866");
147			} else if (strcmp(optarg, "koi8u2dos") == 0) {
148				cs_local = strdup("KOI8-U");
149				cs_dos = strdup("CP866");
150			} else {
151				err(EX_NOINPUT, "%s", optarg);
152			}
153			build_iovec(&iov, &iovlen, "cs_local", cs_local, (size_t)-1);
154			build_iovec(&iov, &iovlen, "cs_dos", cs_dos, (size_t)-1);
155			break;
156		case '?':
157		default:
158			usage();
159			break;
160		}
161	}
162
163	if (optind + 2 != argc)
164		usage();
165
166	if (set_mask && !set_dirmask) {
167		dirmask = mask;
168		set_dirmask = 1;
169	}
170	else if (set_dirmask && !set_mask) {
171		mask = dirmask;
172		set_mask = 1;
173	}
174
175	dev = argv[optind];
176	dir = argv[optind + 1];
177
178	if (cs_local != NULL) {
179		if (set_charset(&iov, &iovlen, cs_local, cs_dos) == -1)
180			err(EX_OSERR, "msdosfs_iconv");
181		build_iovec_argf(&iov, &iovlen, "kiconv", "");
182	} else if (cs_dos != NULL) {
183		build_iovec_argf(&iov, &iovlen, "cs_local", "ISO8859-1");
184		if (set_charset(&iov, &iovlen, "ISO8859-1", cs_dos) == -1)
185			err(EX_OSERR, "msdosfs_iconv");
186		build_iovec_argf(&iov, &iovlen, "kiconv", "");
187	}
188
189	/*
190	 * Resolve the mountpoint with realpath(3) and remove unnecessary
191	 * slashes from the devicename if there are any.
192	 */
193	if (checkpath(dir, mntpath) != 0)
194		err(EX_USAGE, "%s", mntpath);
195	(void)rmslashes(dev, dev);
196
197	if (!set_gid || !set_uid || !set_mask) {
198		if (stat(mntpath, &sb) == -1)
199			err(EX_OSERR, "stat %s", mntpath);
200
201		if (!set_uid)
202			uid = sb.st_uid;
203		if (!set_gid)
204			gid = sb.st_gid;
205		if (!set_mask)
206			mask = dirmask =
207				sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
208	}
209
210	build_iovec(&iov, &iovlen, "fstype", fstype, (size_t)-1);
211	build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
212	build_iovec(&iov, &iovlen, "from", dev, (size_t)-1);
213	build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
214	build_iovec_argf(&iov, &iovlen, "uid", "%d", uid);
215	build_iovec_argf(&iov, &iovlen, "gid", "%u", gid);
216	build_iovec_argf(&iov, &iovlen, "mask", "%u", mask);
217	build_iovec_argf(&iov, &iovlen, "dirmask", "%u", dirmask);
218
219	if (nmount(iov, iovlen, 0) < 0) {
220		if (errmsg[0])
221			err(1, "%s: %s", dev, errmsg);
222		else
223			err(1, "%s", dev);
224	}
225
226	exit (0);
227}
228
229gid_t
230a_gid(char *s)
231{
232	struct group *gr;
233	char *gname;
234	gid_t gid;
235
236	if ((gr = getgrnam(s)) != NULL)
237		gid = gr->gr_gid;
238	else {
239		for (gname = s; *s && isdigit(*s); ++s);
240		if (!*s)
241			gid = atoi(gname);
242		else
243			errx(EX_NOUSER, "unknown group id: %s", gname);
244	}
245	return (gid);
246}
247
248uid_t
249a_uid(char *s)
250{
251	struct passwd *pw;
252	char *uname;
253	uid_t uid;
254
255	if ((pw = getpwnam(s)) != NULL)
256		uid = pw->pw_uid;
257	else {
258		for (uname = s; *s && isdigit(*s); ++s);
259		if (!*s)
260			uid = atoi(uname);
261		else
262			errx(EX_NOUSER, "unknown user id: %s", uname);
263	}
264	return (uid);
265}
266
267mode_t
268a_mask(char *s)
269{
270	int done, rv;
271	char *ep;
272
273	done = 0;
274	rv = -1;
275	if (*s >= '0' && *s <= '7') {
276		done = 1;
277		rv = strtol(optarg, &ep, 8);
278	}
279	if (!done || rv < 0 || *ep)
280		errx(EX_USAGE, "invalid file mode: %s", s);
281	return (rv);
282}
283
284void
285usage(void)
286{
287	fprintf(stderr, "%s\n%s\n%s\n",
288	"usage: mount_msdosfs [-9ls] [-D DOS_codepage] [-g gid] [-L locale]",
289	"                     [-M mask] [-m mask] [-o options] [-u uid]",
290	"		      [-W table] special node");
291	exit(EX_USAGE);
292}
293
294int
295set_charset(struct iovec **iov, int *iovlen, const char *cs_local, const char *cs_dos)
296{
297	int error;
298
299	if (modfind("msdosfs_iconv") < 0)
300		if (kldload("msdosfs_iconv") < 0 || modfind("msdosfs_iconv") < 0) {
301			warnx("cannot find or load \"msdosfs_iconv\" kernel module");
302			return (-1);
303		}
304
305	build_iovec_argf(iov, iovlen, "cs_win", ENCODING_UNICODE);
306	error = kiconv_add_xlat16_cspairs(ENCODING_UNICODE, cs_local);
307	if (error && errno != EEXIST)
308		return (-1);
309	if (cs_dos != NULL) {
310		error = kiconv_add_xlat16_cspairs(cs_dos, cs_local);
311		if (error && errno != EEXIST)
312			return (-1);
313	} else {
314		build_iovec_argf(iov, iovlen, "cs_dos", cs_local);
315		error = kiconv_add_xlat16_cspair(cs_local, cs_local,
316				KICONV_FROM_UPPER | KICONV_LOWER);
317		if (error && errno != EEXIST)
318			return (-1);
319	}
320
321	return (0);
322}
323