mount_msdosfs.c revision 52055 
1/*	$NetBSD: mount_msdos.c,v 1.18 1997/09/16 12:24:18 lukem Exp $	*/
2
3/*
4 * Copyright (c) 1994 Christopher G. Demetriou
5 * 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *      This product includes software developed by Christopher G. Demetriou.
18 * 4. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#ifndef lint
34static const char rcsid[] =
35  "$FreeBSD: head/sbin/mount_msdosfs/mount_msdosfs.c 52055 1999-10-09 11:54:14Z phk $";
36#endif /* not lint */
37
38#include <sys/param.h>
39#include <sys/mount.h>
40#include <sys/stat.h>
41
42#include <msdosfs/msdosfsmount.h>
43
44#include <ctype.h>
45#include <err.h>
46#include <grp.h>
47#include <locale.h>
48#include <pwd.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <sysexits.h>
53#include <unistd.h>
54
55#include "mntopts.h"
56
57/*
58 * XXX - no way to specify "foo=<bar>"-type options; that's what we'd
59 * want for "-u", "-g", "-m", "-L", and "-W".
60 */
61static struct mntopt mopts[] = {
62	MOPT_STDOPTS,
63	MOPT_FORCE,
64	MOPT_SYNC,
65	MOPT_UPDATE,
66#ifdef MSDOSFSMNT_GEMDOSFS
67	{ "gemdosfs", 0, MSDOSFSMNT_GEMDOSFS, 1 },
68#endif
69	{ "shortnames", 0, MSDOSFSMNT_SHORTNAME, 1 },
70	{ "longnames", 0, MSDOSFSMNT_LONGNAME, 1 },
71	{ "nowin95", 0, MSDOSFSMNT_NOWIN95, 1 },
72	{ NULL }
73};
74
75static gid_t	a_gid __P((char *));
76static uid_t	a_uid __P((char *));
77static mode_t	a_mask __P((char *));
78static void	usage __P((void)) __dead2;
79static void     load_u2wtable __P((struct msdosfs_args *, char *));
80static void     load_ultable __P((struct msdosfs_args *, char *));
81
82int
83main(argc, argv)
84	int argc;
85	char **argv;
86{
87	struct msdosfs_args args;
88	struct stat sb;
89	int c, error, mntflags, set_gid, set_uid, set_mask;
90	char *dev, *dir, mntpath[MAXPATHLEN];
91	struct vfsconf vfc;
92
93	mntflags = set_gid = set_uid = set_mask = 0;
94	(void)memset(&args, '\0', sizeof(args));
95	args.magic = MSDOSFS_ARGSMAGIC;
96
97	while ((c = getopt(argc, argv, "sl9u:g:m:o:L:W:")) != -1) {
98		switch (c) {
99#ifdef MSDOSFSMNT_GEMDOSFS
100		case 'G':
101			args.flags |= MSDOSFSMNT_GEMDOSFS;
102			break;
103#endif
104		case 's':
105			args.flags |= MSDOSFSMNT_SHORTNAME;
106			break;
107		case 'l':
108			args.flags |= MSDOSFSMNT_LONGNAME;
109			break;
110		case '9':
111			args.flags |= MSDOSFSMNT_NOWIN95;
112			break;
113		case 'u':
114			args.uid = a_uid(optarg);
115			set_uid = 1;
116			break;
117		case 'g':
118			args.gid = a_gid(optarg);
119			set_gid = 1;
120			break;
121		case 'm':
122			args.mask = a_mask(optarg);
123			set_mask = 1;
124			break;
125		case 'L':
126			load_ultable(&args, optarg);
127			args.flags |= MSDOSFSMNT_ULTABLE;
128			break;
129		case 'W':
130			load_u2wtable(&args, optarg);
131			args.flags |= MSDOSFSMNT_U2WTABLE;
132			break;
133		case 'o':
134			getmntopts(optarg, mopts, &mntflags, &args.flags);
135			break;
136		case '?':
137		default:
138			usage();
139			break;
140		}
141	}
142
143	if (optind + 2 != argc)
144		usage();
145
146	dev = argv[optind];
147	dir = argv[optind + 1];
148
149	/*
150	 * Resolve the mountpoint with realpath(3) and remove unnecessary
151	 * slashes from the devicename if there are any.
152	 */
153	(void)checkpath(dir, mntpath);
154	(void)rmslashes(dev, dev);
155
156	args.fspec = dev;
157	args.export.ex_root = -2;	/* unchecked anyway on DOS fs */
158	if (mntflags & MNT_RDONLY)
159		args.export.ex_flags = MNT_EXRDONLY;
160	else
161		args.export.ex_flags = 0;
162	if (!set_gid || !set_uid || !set_mask) {
163		if (stat(mntpath, &sb) == -1)
164			err(EX_OSERR, "stat %s", mntpath);
165
166		if (!set_uid)
167			args.uid = sb.st_uid;
168		if (!set_gid)
169			args.gid = sb.st_gid;
170		if (!set_mask)
171			args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
172	}
173
174	error = getvfsbyname("msdos", &vfc);
175	if (error && vfsisloadable("msdos")) {
176		if (vfsload("msdos"))
177			err(EX_OSERR, "vfsload(msdos)");
178		endvfsent();	/* clear cache */
179		error = getvfsbyname("msdos", &vfc);
180	}
181	if (error)
182		errx(EX_OSERR, "msdos filesystem is not available");
183
184	if (mount(vfc.vfc_name, mntpath, mntflags, &args) < 0)
185		err(EX_OSERR, "%s", dev);
186
187	exit (0);
188}
189
190gid_t
191a_gid(s)
192	char *s;
193{
194	struct group *gr;
195	char *gname;
196	gid_t gid;
197
198	if ((gr = getgrnam(s)) != NULL)
199		gid = gr->gr_gid;
200	else {
201		for (gname = s; *s && isdigit(*s); ++s);
202		if (!*s)
203			gid = atoi(gname);
204		else
205			errx(EX_NOUSER, "unknown group id: %s", gname);
206	}
207	return (gid);
208}
209
210uid_t
211a_uid(s)
212	char *s;
213{
214	struct passwd *pw;
215	char *uname;
216	uid_t uid;
217
218	if ((pw = getpwnam(s)) != NULL)
219		uid = pw->pw_uid;
220	else {
221		for (uname = s; *s && isdigit(*s); ++s);
222		if (!*s)
223			uid = atoi(uname);
224		else
225			errx(EX_NOUSER, "unknown user id: %s", uname);
226	}
227	return (uid);
228}
229
230mode_t
231a_mask(s)
232	char *s;
233{
234	int done, rv;
235	char *ep;
236
237	done = 0;
238	rv = -1;
239	if (*s >= '0' && *s <= '7') {
240		done = 1;
241		rv = strtol(optarg, &ep, 8);
242	}
243	if (!done || rv < 0 || *ep)
244		errx(EX_USAGE, "invalid file mode: %s", s);
245	return (rv);
246}
247
248void
249usage()
250{
251	fprintf(stderr, "%s\n%s\n",
252	"usage: mount_msdos [-o options] [-u user] [-g group] [-m mask]",
253	"                   [-s] [-l] [-9] [-L locale] [-W table] bdev dir");
254	exit(EX_USAGE);
255}
256
257void
258load_u2wtable (pargs, name)
259	struct msdosfs_args *pargs;
260	char *name;
261{
262	FILE *f;
263	int i, code;
264	char buf[128];
265	char *fn;
266
267	if (*name == '/')
268		fn = name;
269	else {
270		snprintf(buf, sizeof(buf), "/usr/libdata/msdosfs/%s", name);
271		buf[127] = '\0';
272		fn = buf;
273	}
274	if ((f = fopen(fn, "r")) == NULL)
275		err(EX_NOINPUT, "%s", fn);
276	for (i = 0; i < 128; i++) {
277		if (fscanf(f, "%i", &code) != 1)
278			errx(EX_DATAERR, "u2w: missing item number %d", i);
279		pargs->u2w[i] = code;
280	}
281	for (i = 0; i < 128; i++) {
282		if (fscanf(f, "%i", &code) != 1)
283			errx(EX_DATAERR, "d2u: missing item number %d", i);
284		pargs->d2u[i] = code;
285	}
286	for (i = 0; i < 128; i++) {
287		if (fscanf(f, "%i", &code) != 1)
288			errx(EX_DATAERR, "u2d: missing item number %d", i);
289		pargs->u2d[i] = code;
290	}
291	fclose(f);
292}
293
294void
295load_ultable (pargs, name)
296	struct msdosfs_args *pargs;
297	char *name;
298{
299	int i;
300
301	if (setlocale(LC_CTYPE, name) == NULL)
302		err(EX_CONFIG, name);
303	for (i = 0; i < 128; i++) {
304		pargs->ul[i] = tolower(i | 0x80);
305		pargs->lu[i] = toupper(i | 0x80);
306	}
307}
308