mount_msdosfs.c revision 77162 
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 77162 2001-05-25 08:14:14Z ru $";
36#endif /* not lint */
37
38#include <sys/param.h>
39#include <sys/mount.h>
40#include <sys/stat.h>
41
42#include <fs/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/* must be after stdio to declare fparseln */
51#include <libutil.h>
52#include <stdlib.h>
53#include <string.h>
54#include <sysexits.h>
55#include <unistd.h>
56
57#include "mntopts.h"
58
59/*
60 * XXX - no way to specify "foo=<bar>"-type options; that's what we'd
61 * want for "-u", "-g", "-m", "-L", and "-W".
62 */
63static struct mntopt mopts[] = {
64	MOPT_STDOPTS,
65	MOPT_FORCE,
66	MOPT_SYNC,
67	MOPT_UPDATE,
68#ifdef MSDOSFSMNT_GEMDOSFS
69	{ "gemdosfs", 0, MSDOSFSMNT_GEMDOSFS, 1 },
70#endif
71	{ "shortnames", 0, MSDOSFSMNT_SHORTNAME, 1 },
72	{ "longnames", 0, MSDOSFSMNT_LONGNAME, 1 },
73	{ "nowin95", 0, MSDOSFSMNT_NOWIN95, 1 },
74	{ NULL }
75};
76
77static gid_t	a_gid __P((char *));
78static uid_t	a_uid __P((char *));
79static mode_t	a_mask __P((char *));
80static void	usage __P((void)) __dead2;
81static void     load_u2wtable __P((struct msdosfs_args *, char *));
82static void     load_ultable __P((struct msdosfs_args *, char *));
83
84int
85main(argc, argv)
86	int argc;
87	char **argv;
88{
89	struct msdosfs_args args;
90	struct stat sb;
91	int c, error, mntflags, set_gid, set_uid, set_mask;
92	char *dev, *dir, mntpath[MAXPATHLEN];
93	struct vfsconf vfc;
94
95	mntflags = set_gid = set_uid = set_mask = 0;
96	(void)memset(&args, '\0', sizeof(args));
97	args.magic = MSDOSFS_ARGSMAGIC;
98
99	while ((c = getopt(argc, argv, "sl9u:g:m:o:L:W:")) != -1) {
100		switch (c) {
101#ifdef MSDOSFSMNT_GEMDOSFS
102		case 'G':
103			args.flags |= MSDOSFSMNT_GEMDOSFS;
104			break;
105#endif
106		case 's':
107			args.flags |= MSDOSFSMNT_SHORTNAME;
108			break;
109		case 'l':
110			args.flags |= MSDOSFSMNT_LONGNAME;
111			break;
112		case '9':
113			args.flags |= MSDOSFSMNT_NOWIN95;
114			break;
115		case 'u':
116			args.uid = a_uid(optarg);
117			set_uid = 1;
118			break;
119		case 'g':
120			args.gid = a_gid(optarg);
121			set_gid = 1;
122			break;
123		case 'm':
124			args.mask = a_mask(optarg);
125			set_mask = 1;
126			break;
127		case 'L':
128			load_ultable(&args, optarg);
129			args.flags |= MSDOSFSMNT_ULTABLE;
130			break;
131		case 'W':
132			load_u2wtable(&args, optarg);
133			args.flags |= MSDOSFSMNT_U2WTABLE;
134			break;
135		case 'o':
136			getmntopts(optarg, mopts, &mntflags, &args.flags);
137			break;
138		case '?':
139		default:
140			usage();
141			break;
142		}
143	}
144
145	if (optind + 2 != argc)
146		usage();
147
148	dev = argv[optind];
149	dir = argv[optind + 1];
150
151	/*
152	 * Resolve the mountpoint with realpath(3) and remove unnecessary
153	 * slashes from the devicename if there are any.
154	 */
155	(void)checkpath(dir, mntpath);
156	(void)rmslashes(dev, dev);
157
158	args.fspec = dev;
159	args.export.ex_root = -2;	/* unchecked anyway on DOS fs */
160	if (mntflags & MNT_RDONLY)
161		args.export.ex_flags = MNT_EXRDONLY;
162	else
163		args.export.ex_flags = 0;
164	if (!set_gid || !set_uid || !set_mask) {
165		if (stat(mntpath, &sb) == -1)
166			err(EX_OSERR, "stat %s", mntpath);
167
168		if (!set_uid)
169			args.uid = sb.st_uid;
170		if (!set_gid)
171			args.gid = sb.st_gid;
172		if (!set_mask)
173			args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
174	}
175
176	error = getvfsbyname("msdos", &vfc);
177	if (error && vfsisloadable("msdos")) {
178		if (vfsload("msdos"))
179			err(EX_OSERR, "vfsload(msdos)");
180		endvfsent();	/* clear cache */
181		error = getvfsbyname("msdos", &vfc);
182	}
183	if (error)
184		errx(EX_OSERR, "msdos filesystem is not available");
185
186	if (mount(vfc.vfc_name, mntpath, mntflags, &args) < 0)
187		err(EX_OSERR, "%s", dev);
188
189	exit (0);
190}
191
192gid_t
193a_gid(s)
194	char *s;
195{
196	struct group *gr;
197	char *gname;
198	gid_t gid;
199
200	if ((gr = getgrnam(s)) != NULL)
201		gid = gr->gr_gid;
202	else {
203		for (gname = s; *s && isdigit(*s); ++s);
204		if (!*s)
205			gid = atoi(gname);
206		else
207			errx(EX_NOUSER, "unknown group id: %s", gname);
208	}
209	return (gid);
210}
211
212uid_t
213a_uid(s)
214	char *s;
215{
216	struct passwd *pw;
217	char *uname;
218	uid_t uid;
219
220	if ((pw = getpwnam(s)) != NULL)
221		uid = pw->pw_uid;
222	else {
223		for (uname = s; *s && isdigit(*s); ++s);
224		if (!*s)
225			uid = atoi(uname);
226		else
227			errx(EX_NOUSER, "unknown user id: %s", uname);
228	}
229	return (uid);
230}
231
232mode_t
233a_mask(s)
234	char *s;
235{
236	int done, rv;
237	char *ep;
238
239	done = 0;
240	rv = -1;
241	if (*s >= '0' && *s <= '7') {
242		done = 1;
243		rv = strtol(optarg, &ep, 8);
244	}
245	if (!done || rv < 0 || *ep)
246		errx(EX_USAGE, "invalid file mode: %s", s);
247	return (rv);
248}
249
250void
251usage()
252{
253	fprintf(stderr, "%s\n%s\n",
254	"usage: mount_msdos [-o options] [-u user] [-g group] [-m mask]",
255	"                   [-s] [-l] [-9] [-L locale] [-W table] bdev dir");
256	exit(EX_USAGE);
257}
258
259void
260load_u2wtable (pargs, name)
261	struct msdosfs_args *pargs;
262	char *name;
263{
264	FILE *f;
265	int i, j, code[8];
266	size_t line = 0;
267	char buf[128];
268	char *fn, *s, *p;
269
270	if (*name == '/')
271		fn = name;
272	else {
273		snprintf(buf, sizeof(buf), "/usr/libdata/msdosfs/%s", name);
274		buf[127] = '\0';
275		fn = buf;
276	}
277	if ((f = fopen(fn, "r")) == NULL)
278		err(EX_NOINPUT, "%s", fn);
279	p = NULL;
280	for (i = 0; i < 16; i++) {
281		do {
282			if (p != NULL) free(p);
283			if ((p = s = fparseln(f, NULL, &line, NULL, 0)) == NULL)
284				errx(EX_DATAERR, "can't read u2w table row %d near line %d", i, line);
285			while (isspace((unsigned char)*s))
286				s++;
287		} while (*s == '\0');
288		if (sscanf(s, "%i%i%i%i%i%i%i%i",
289code, code + 1, code + 2, code + 3, code + 4, code + 5, code + 6, code + 7) != 8)
290			errx(EX_DATAERR, "u2w table: missing item(s) in row %d, line %d", i, line);
291		for (j = 0; j < 8; j++)
292			pargs->u2w[i * 8 + j] = code[j];
293	}
294	for (i = 0; i < 16; i++) {
295		do {
296			free(p);
297			if ((p = s = fparseln(f, NULL, &line, NULL, 0)) == NULL)
298				errx(EX_DATAERR, "can't read d2u table row %d near line %d", i, line);
299			while (isspace((unsigned char)*s))
300				s++;
301		} while (*s == '\0');
302		if (sscanf(s, "%i%i%i%i%i%i%i%i",
303code, code + 1, code + 2, code + 3, code + 4, code + 5, code + 6, code + 7) != 8)
304			errx(EX_DATAERR, "d2u table: missing item(s) in row %d, line %d", i, line);
305		for (j = 0; j < 8; j++)
306			pargs->d2u[i * 8 + j] = code[j];
307	}
308	for (i = 0; i < 16; i++) {
309		do {
310			free(p);
311			if ((p = s = fparseln(f, NULL, &line, NULL, 0)) == NULL)
312				errx(EX_DATAERR, "can't read u2d table row %d near line %d", i, line);
313			while (isspace((unsigned char)*s))
314				s++;
315		} while (*s == '\0');
316		if (sscanf(s, "%i%i%i%i%i%i%i%i",
317code, code + 1, code + 2, code + 3, code + 4, code + 5, code + 6, code + 7) != 8)
318			errx(EX_DATAERR, "u2d table: missing item(s) in row %d, line %d", i, line);
319		for (j = 0; j < 8; j++)
320			pargs->u2d[i * 8 + j] = code[j];
321	}
322	free(p);
323	fclose(f);
324}
325
326void
327load_ultable (pargs, name)
328	struct msdosfs_args *pargs;
329	char *name;
330{
331	int i;
332
333	if (setlocale(LC_CTYPE, name) == NULL)
334		err(EX_CONFIG, "%s", name);
335	for (i = 0; i < 128; i++) {
336		pargs->ul[i] = tolower(i | 0x80);
337		pargs->lu[i] = toupper(i | 0x80);
338	}
339}
340