mount_msdosfs.c revision 2892 
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 char rcsid[] = "$Id: mount_msdos.c,v 1.8 1994/07/16 21:32:08 cgd Exp $";
33#endif /* not lint */
34
35#include <sys/cdefs.h>
36#include <sys/param.h>
37#define MSDOSFS
38#include <sys/mount.h>
39#include <sys/stat.h>
40#include <ctype.h>
41#include <err.h>
42#include <grp.h>
43#include <pwd.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48
49#include "mntopts.h"
50
51struct mntopt mopts[] = {
52	MOPT_STDOPTS,
53	{ NULL }
54};
55
56gid_t	a_gid __P((char *));
57uid_t	a_uid __P((char *));
58mode_t	a_mask __P((char *));
59void	usage __P((void));
60
61int
62main(argc, argv)
63	int argc;
64	char **argv;
65{
66	struct msdosfs_args args;
67	struct stat sb;
68	int c, mntflags, set_gid, set_uid, set_mask;
69	char *dev, *dir, ndir[MAXPATHLEN+1];
70
71	mntflags = set_gid = set_uid = set_mask = 0;
72	(void)memset(&args, '\0', sizeof(args));
73
74	while ((c = getopt(argc, argv, "u:g:m:o:")) != EOF) {
75		switch (c) {
76		case 'u':
77			args.uid = a_uid(optarg);
78			set_uid = 1;
79			break;
80		case 'g':
81			args.gid = a_gid(optarg);
82			set_gid = 1;
83			break;
84		case 'm':
85			args.mask = a_mask(optarg);
86			set_mask = 1;
87			break;
88		case 'o':
89			getmntopts(optarg, mopts, &mntflags);
90			break;
91		case '?':
92		default:
93			usage();
94			break;
95		}
96	}
97
98	if (optind + 2 != argc)
99		usage();
100
101	dev = argv[optind];
102	dir = argv[optind + 1];
103	if (dir[0] != '/') {
104		warnx("\"%s\" is a relative path.", dir);
105		if (getcwd(ndir, sizeof(ndir)) == NULL)
106			err(1, "getcwd");
107		strncat(ndir, "/", sizeof(ndir) - strlen(ndir) - 1);
108		strncat(ndir, dir, sizeof(ndir) - strlen(ndir) - 1);
109		dir = ndir;
110		warnx("using \"%s\" instead.", dir);
111	}
112
113	args.fspec = dev;
114	args.export.ex_root = -2;	/* unchecked anyway on DOS fs */
115	if (mntflags & MNT_RDONLY)
116		args.export.ex_flags = MNT_EXRDONLY;
117	else
118		args.export.ex_flags = 0;
119	if (!set_gid || !set_uid || !set_mask) {
120		if (stat(dir, &sb) == -1)
121			err(1, "stat %s", dir);
122
123		if (!set_uid)
124			args.uid = sb.st_uid;
125		if (!set_gid)
126			args.gid = sb.st_gid;
127		if (!set_mask)
128			args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
129	}
130
131	if (mount(MOUNT_MSDOS, dir, mntflags, &args) < 0)
132		err(1, "mount");
133
134	exit (0);
135}
136
137gid_t
138a_gid(s)
139	char *s;
140{
141	struct group *gr;
142	char *gname;
143	gid_t gid;
144
145	if ((gr = getgrnam(s)) != NULL)
146		gid = gr->gr_gid;
147	else {
148		for (gname = s; *s && isdigit(*s); ++s);
149		if (!*s)
150			gid = atoi(gname);
151		else
152			errx(1, "unknown group id: %s", gname);
153	}
154	return (gid);
155}
156
157uid_t
158a_uid(s)
159	char *s;
160{
161	struct passwd *pw;
162	char *uname;
163	uid_t uid;
164
165	if ((pw = getpwnam(s)) != NULL)
166		uid = pw->pw_uid;
167	else {
168		for (uname = s; *s && isdigit(*s); ++s);
169		if (!*s)
170			uid = atoi(uname);
171		else
172			errx(1, "unknown user id: %s", uname);
173	}
174	return (uid);
175}
176
177mode_t
178a_mask(s)
179	char *s;
180{
181	int done, rv;
182	char *ep;
183
184	done = 0;
185	if (*s >= '0' && *s <= '7') {
186		done = 1;
187		rv = strtol(optarg, &ep, 8);
188	}
189	if (!done || rv < 0 || *ep)
190		errx(1, "invalid file mode: %s", s);
191	return (rv);
192}
193
194void
195usage()
196{
197	fprintf(stderr, "usage: mount_msdos [-F flags] [-u user] [-g group] [-m mask] bdev dir\n");
198	exit(1);
199}
200