mount_msdosfs.c revision 28731 
1/*
2 * Copyright (c) 1994 Christopher G. Demetriou
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *      This product includes software developed by Christopher G. Demetriou.
16 * 4. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef lint
32static const char rcsid[] =
33	"$Id: mount_msdos.c,v 1.9 1997/03/29 03:32:25 imp Exp $";
34#endif /* not lint */
35
36#include <sys/param.h>
37#include <sys/mount.h>
38#include <sys/stat.h>
39
40#include <msdosfs/msdosfsmount.h>
41
42#include <ctype.h>
43#include <err.h>
44#include <grp.h>
45#include <pwd.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <sysexits.h>
50#include <unistd.h>
51
52#include "mntopts.h"
53
54static struct mntopt mopts[] = {
55	MOPT_STDOPTS,
56	MOPT_FORCE,
57	MOPT_SYNC,
58	MOPT_UPDATE,
59	{ NULL }
60};
61
62static gid_t	a_gid __P((char *));
63static uid_t	a_uid __P((char *));
64static mode_t	a_mask __P((char *));
65static void	usage __P((void)) __dead2;
66
67int
68main(argc, argv)
69	int argc;
70	char **argv;
71{
72	struct msdosfs_args args;
73	struct stat sb;
74	int c, error, mntflags, set_gid, set_uid, set_mask;
75	char *dev, *dir, ndir[MAXPATHLEN+1];
76	struct vfsconf vfc;
77
78	mntflags = set_gid = set_uid = set_mask = 0;
79	(void)memset(&args, '\0', sizeof(args));
80
81	while ((c = getopt(argc, argv, "u:g:m:o:")) != -1) {
82		switch (c) {
83		case 'u':
84			args.uid = a_uid(optarg);
85			set_uid = 1;
86			break;
87		case 'g':
88			args.gid = a_gid(optarg);
89			set_gid = 1;
90			break;
91		case 'm':
92			args.mask = a_mask(optarg);
93			set_mask = 1;
94			break;
95		case 'o':
96			getmntopts(optarg, mopts, &mntflags, 0);
97			break;
98		case '?':
99		default:
100			usage();
101			break;
102		}
103	}
104
105	if (optind + 2 != argc)
106		usage();
107
108	dev = argv[optind];
109	dir = argv[optind + 1];
110	if (dir[0] != '/') {
111		warnx("\"%s\" is a relative path", dir);
112		if (getcwd(ndir, sizeof(ndir)) == NULL)
113			err(EX_OSERR, "getcwd");
114		strncat(ndir, "/", sizeof(ndir) - strlen(ndir) - 1);
115		strncat(ndir, dir, sizeof(ndir) - strlen(ndir) - 1);
116		dir = ndir;
117		warnx("using \"%s\" instead", dir);
118	}
119
120	args.fspec = dev;
121	args.export.ex_root = -2;	/* unchecked anyway on DOS fs */
122	if (mntflags & MNT_RDONLY)
123		args.export.ex_flags = MNT_EXRDONLY;
124	else
125		args.export.ex_flags = 0;
126	if (!set_gid || !set_uid || !set_mask) {
127		if (stat(dir, &sb) == -1)
128			err(EX_OSERR, "stat %s", dir);
129
130		if (!set_uid)
131			args.uid = sb.st_uid;
132		if (!set_gid)
133			args.gid = sb.st_gid;
134		if (!set_mask)
135			args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
136	}
137
138	error = getvfsbyname("msdos", &vfc);
139	if (error && vfsisloadable("msdos")) {
140		if (vfsload("msdos"))
141			err(EX_OSERR, "vfsload(msdos)");
142		endvfsent();	/* clear cache */
143		error = getvfsbyname("msdos", &vfc);
144	}
145	if (error)
146		errx(EX_OSERR, "msdos filesystem is not available");
147
148	if (mount(vfc.vfc_name, dir, mntflags, &args) < 0)
149		err(EX_OSERR, "%s", dev);
150
151	exit (0);
152}
153
154gid_t
155a_gid(s)
156	char *s;
157{
158	struct group *gr;
159	char *gname;
160	gid_t gid;
161
162	if ((gr = getgrnam(s)) != NULL)
163		gid = gr->gr_gid;
164	else {
165		for (gname = s; *s && isdigit(*s); ++s);
166		if (!*s)
167			gid = atoi(gname);
168		else
169			errx(EX_NOUSER, "unknown group id: %s", gname);
170	}
171	return (gid);
172}
173
174uid_t
175a_uid(s)
176	char *s;
177{
178	struct passwd *pw;
179	char *uname;
180	uid_t uid;
181
182	if ((pw = getpwnam(s)) != NULL)
183		uid = pw->pw_uid;
184	else {
185		for (uname = s; *s && isdigit(*s); ++s);
186		if (!*s)
187			uid = atoi(uname);
188		else
189			errx(EX_NOUSER, "unknown user id: %s", uname);
190	}
191	return (uid);
192}
193
194mode_t
195a_mask(s)
196	char *s;
197{
198	int done, rv;
199	char *ep;
200
201	done = 0;
202	if (*s >= '0' && *s <= '7') {
203		done = 1;
204		rv = strtol(optarg, &ep, 8);
205	}
206	if (!done || rv < 0 || *ep)
207		errx(EX_USAGE, "invalid file mode: %s", s);
208	return (rv);
209}
210
211void
212usage()
213{
214	fprintf(stderr, "usage: mount_msdos [-F flags] [-u user] [-g group] [-m mask] bdev dir\n");
215	exit(EX_USAGE);
216}
217