mount_msdosfs.c revision 22990 
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	"$Id$";
34#endif /* not lint */
35
36#include <sys/cdefs.h>
37#include <sys/param.h>
38#define MSDOSFS
39#include <sys/mount.h>
40#include <sys/stat.h>
41#include <ctype.h>
42#include <err.h>
43#include <grp.h>
44#include <pwd.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <sysexits.h>
49#include <unistd.h>
50
51#include "mntopts.h"
52
53static struct mntopt mopts[] = {
54	MOPT_STDOPTS,
55	{ NULL }
56};
57
58static gid_t	a_gid __P((char *));
59static uid_t	a_uid __P((char *));
60static mode_t	a_mask __P((char *));
61static void	usage __P((void)) __dead2;
62
63int
64main(argc, argv)
65	int argc;
66	char **argv;
67{
68	struct msdosfs_args args;
69	struct stat sb;
70	int c, mntflags, set_gid, set_uid, set_mask;
71	char *dev, *dir, ndir[MAXPATHLEN+1];
72	struct vfsconf *vfc;
73
74	mntflags = set_gid = set_uid = set_mask = 0;
75	(void)memset(&args, '\0', sizeof(args));
76
77	while ((c = getopt(argc, argv, "u:g:m:o:")) != EOF) {
78		switch (c) {
79		case 'u':
80			args.uid = a_uid(optarg);
81			set_uid = 1;
82			break;
83		case 'g':
84			args.gid = a_gid(optarg);
85			set_gid = 1;
86			break;
87		case 'm':
88			args.mask = a_mask(optarg);
89			set_mask = 1;
90			break;
91		case 'o':
92			getmntopts(optarg, mopts, &mntflags, 0);
93			break;
94		case '?':
95		default:
96			usage();
97			break;
98		}
99	}
100
101	if (optind + 2 != argc)
102		usage();
103
104	dev = argv[optind];
105	dir = argv[optind + 1];
106	if (dir[0] != '/') {
107		warnx("\"%s\" is a relative path", dir);
108		if (getcwd(ndir, sizeof(ndir)) == NULL)
109			err(EX_OSERR, "getcwd");
110		strncat(ndir, "/", sizeof(ndir) - strlen(ndir) - 1);
111		strncat(ndir, dir, sizeof(ndir) - strlen(ndir) - 1);
112		dir = ndir;
113		warnx("using \"%s\" instead", dir);
114	}
115
116	args.fspec = dev;
117	args.export.ex_root = -2;	/* unchecked anyway on DOS fs */
118	if (mntflags & MNT_RDONLY)
119		args.export.ex_flags = MNT_EXRDONLY;
120	else
121		args.export.ex_flags = 0;
122	if (!set_gid || !set_uid || !set_mask) {
123		if (stat(dir, &sb) == -1)
124			err(EX_OSERR, "stat %s", dir);
125
126		if (!set_uid)
127			args.uid = sb.st_uid;
128		if (!set_gid)
129			args.gid = sb.st_gid;
130		if (!set_mask)
131			args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
132	}
133
134	vfc = getvfsbyname("msdos");
135	if(!vfc && vfsisloadable("msdos")) {
136		if(vfsload("msdos"))
137			err(EX_OSERR, "vfsload(msdos)");
138		endvfsent();	/* clear cache */
139		vfc = getvfsbyname("msdos");
140	}
141	if (!vfc)
142		errx(EX_OSERR, "msdos filesystem is not available");
143
144	if (mount(vfc->vfc_index, dir, mntflags, &args) < 0)
145		err(EX_OSERR, "%s", dev);
146
147	exit (0);
148}
149
150gid_t
151a_gid(s)
152	char *s;
153{
154	struct group *gr;
155	char *gname;
156	gid_t gid;
157
158	if ((gr = getgrnam(s)) != NULL)
159		gid = gr->gr_gid;
160	else {
161		for (gname = s; *s && isdigit(*s); ++s);
162		if (!*s)
163			gid = atoi(gname);
164		else
165			errx(EX_NOUSER, "unknown group id: %s", gname);
166	}
167	return (gid);
168}
169
170uid_t
171a_uid(s)
172	char *s;
173{
174	struct passwd *pw;
175	char *uname;
176	uid_t uid;
177
178	if ((pw = getpwnam(s)) != NULL)
179		uid = pw->pw_uid;
180	else {
181		for (uname = s; *s && isdigit(*s); ++s);
182		if (!*s)
183			uid = atoi(uname);
184		else
185			errx(EX_NOUSER, "unknown user id: %s", uname);
186	}
187	return (uid);
188}
189
190mode_t
191a_mask(s)
192	char *s;
193{
194	int done, rv;
195	char *ep;
196
197	done = 0;
198	if (*s >= '0' && *s <= '7') {
199		done = 1;
200		rv = strtol(optarg, &ep, 8);
201	}
202	if (!done || rv < 0 || *ep)
203		errx(EX_USAGE, "invalid file mode: %s", s);
204	return (rv);
205}
206
207void
208usage()
209{
210	fprintf(stderr, "usage: mount_msdos [-F flags] [-u user] [-g group] [-m mask] bdev dir\n");
211	exit(EX_USAGE);
212}
213