mknod.c revision 55496 
1/*
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kevin Fall.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static const char copyright[] =
39"@(#) Copyright (c) 1989, 1993\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)mknod.c	8.1 (Berkeley) 6/5/93";
46#endif
47static const char rcsid[] =
48  "$FreeBSD: head/sbin/mknod/mknod.c 55496 2000-01-06 05:20:14Z obrien $";
49#endif /* not lint */
50
51#include <sys/types.h>
52#include <sys/stat.h>
53
54#include <err.h>
55#include <errno.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <unistd.h>
59#include <grp.h>
60#include <pwd.h>
61#include <string.h>
62
63static void
64usage()
65{
66
67	(void)fprintf(stderr,
68	    "usage: mknod name [b | c] major minor [owner:group]\n");
69	exit(1);
70}
71
72static u_long
73id(name, type)
74	char *name, *type;
75{
76	u_long val;
77	char *ep;
78
79	/*
80	 * XXX
81	 * We know that uid_t's and gid_t's are unsigned longs.
82	 */
83	errno = 0;
84	val = strtoul(name, &ep, 10);
85	if (errno)
86		err(1, "%s", name);
87	if (*ep != '\0')
88		errx(1, "%s: illegal %s name", name, type);
89	return (val);
90}
91
92static gid_t
93a_gid(s)
94	char *s;
95{
96	struct group *gr;
97
98	if (*s == '\0')			/* Argument was "uid[:.]". */
99		errx(1, "group must be specified when the owner is");
100	return ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
101}
102
103static uid_t
104a_uid(s)
105	char *s;
106{
107	struct passwd *pw;
108
109	if (*s == '\0')			/* Argument was "[:.]gid". */
110		errx(1, "owner must be specified when the group is");
111	return ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
112}
113
114int
115main(argc, argv)
116	int argc;
117	char **argv;
118{
119	int range_error;
120	uid_t uid;
121	gid_t gid;
122	mode_t mode;
123	dev_t dev;
124	char *cp, *endp;
125	long mymajor, myminor;
126
127	if (argc != 5 && argc != 6)
128		usage();
129
130	mode = 0666;
131	if (argv[2][0] == 'c')
132		mode |= S_IFCHR;
133	else if (argv[2][0] == 'b')
134		mode |= S_IFBLK;
135	else
136		errx(1, "node must be type 'b' or 'c'");
137
138	errno = 0;
139	mymajor = (long)strtoul(argv[3], &endp, 0);
140	if (endp == argv[3] || *endp != '\0')
141		errx(1, "%s: non-numeric major number", argv[3]);
142	range_error = errno;
143	errno = 0;
144	myminor = (long)strtoul(argv[4], &endp, 0);
145	if (endp == argv[4] || *endp != '\0')
146		errx(1, "%s: non-numeric minor number", argv[4]);
147	range_error |= errno;
148	dev = makedev(mymajor, myminor);
149	if (range_error || major(dev) != (u_int) mymajor ||
150	    minor(dev) != (u_int) myminor)
151		errx(1, "major or minor number too large");
152
153	uid = gid = -1;
154	if (6 == argc) {
155	    	/* have owner:group */
156		if ((cp = strchr(argv[5], ':')) != NULL) {
157			*cp++ = '\0';
158			gid = a_gid(cp);
159		} else
160		usage();
161		uid = a_uid(argv[5]);
162	}
163
164	if (mknod(argv[1], mode, dev) != 0)
165		err(1, "%s", argv[1]);
166	if (6 == argc)
167		if (chown(argv[1], uid, gid))
168			err(1, "setting ownership on %s", argv[1]);
169	exit(0);
170}
171