mount_msdosfs.c revision 4065 
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 1.2 1994/09/22 22:16:35 wollman 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	struct vfsconf *vfc;
71
72	mntflags = set_gid = set_uid = set_mask = 0;
73	(void)memset(&args, '\0', sizeof(args));
74
75	while ((c = getopt(argc, argv, "u:g:m:o:")) != EOF) {
76		switch (c) {
77		case 'u':
78			args.uid = a_uid(optarg);
79			set_uid = 1;
80			break;
81		case 'g':
82			args.gid = a_gid(optarg);
83			set_gid = 1;
84			break;
85		case 'm':
86			args.mask = a_mask(optarg);
87			set_mask = 1;
88			break;
89		case 'o':
90			getmntopts(optarg, mopts, &mntflags, 0);
91			break;
92		case '?':
93		default:
94			usage();
95			break;
96		}
97	}
98
99	if (optind + 2 != argc)
100		usage();
101
102	dev = argv[optind];
103	dir = argv[optind + 1];
104	if (dir[0] != '/') {
105		warnx("\"%s\" is a relative path.", dir);
106		if (getcwd(ndir, sizeof(ndir)) == NULL)
107			err(1, "getcwd");
108		strncat(ndir, "/", sizeof(ndir) - strlen(ndir) - 1);
109		strncat(ndir, dir, sizeof(ndir) - strlen(ndir) - 1);
110		dir = ndir;
111		warnx("using \"%s\" instead.", dir);
112	}
113
114	args.fspec = dev;
115	args.export.ex_root = -2;	/* unchecked anyway on DOS fs */
116	if (mntflags & MNT_RDONLY)
117		args.export.ex_flags = MNT_EXRDONLY;
118	else
119		args.export.ex_flags = 0;
120	if (!set_gid || !set_uid || !set_mask) {
121		if (stat(dir, &sb) == -1)
122			err(1, "stat %s", dir);
123
124		if (!set_uid)
125			args.uid = sb.st_uid;
126		if (!set_gid)
127			args.gid = sb.st_gid;
128		if (!set_mask)
129			args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
130	}
131
132	vfc = getvfsbyname("msdos");
133	if(!vfc && vfsisloadable("msdos")) {
134		if(vfsload("msdos"))
135			err(1, "vfsload(msdos)");
136		endvfsent();	/* clear cache */
137		vfc = getvfsbyname("msdos");
138	}
139
140	if (mount(vfc ? vfc->vfc_index : MOUNT_MSDOS, dir, mntflags, &args) < 0)
141		err(1, "mount");
142
143	exit (0);
144}
145
146gid_t
147a_gid(s)
148	char *s;
149{
150	struct group *gr;
151	char *gname;
152	gid_t gid;
153
154	if ((gr = getgrnam(s)) != NULL)
155		gid = gr->gr_gid;
156	else {
157		for (gname = s; *s && isdigit(*s); ++s);
158		if (!*s)
159			gid = atoi(gname);
160		else
161			errx(1, "unknown group id: %s", gname);
162	}
163	return (gid);
164}
165
166uid_t
167a_uid(s)
168	char *s;
169{
170	struct passwd *pw;
171	char *uname;
172	uid_t uid;
173
174	if ((pw = getpwnam(s)) != NULL)
175		uid = pw->pw_uid;
176	else {
177		for (uname = s; *s && isdigit(*s); ++s);
178		if (!*s)
179			uid = atoi(uname);
180		else
181			errx(1, "unknown user id: %s", uname);
182	}
183	return (uid);
184}
185
186mode_t
187a_mask(s)
188	char *s;
189{
190	int done, rv;
191	char *ep;
192
193	done = 0;
194	if (*s >= '0' && *s <= '7') {
195		done = 1;
196		rv = strtol(optarg, &ep, 8);
197	}
198	if (!done || rv < 0 || *ep)
199		errx(1, "invalid file mode: %s", s);
200	return (rv);
201}
202
203void
204usage()
205{
206	fprintf(stderr, "usage: mount_msdos [-F flags] [-u user] [-g group] [-m mask] bdev dir\n");
207	exit(1);
208}
209