mknod.c revision 128073 
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 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef lint
34static const char copyright[] =
35"@(#) Copyright (c) 1989, 1993\n\
36	The Regents of the University of California.  All rights reserved.\n";
37#endif /* not lint */
38
39#ifndef lint
40#if 0
41static char sccsid[] = "@(#)mknod.c	8.1 (Berkeley) 6/5/93";
42#endif
43static const char rcsid[] =
44  "$FreeBSD: head/sbin/mknod/mknod.c 128073 2004-04-09 19:58:40Z markm $";
45#endif /* not lint */
46
47#include <sys/types.h>
48#include <sys/stat.h>
49
50#include <err.h>
51#include <errno.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <unistd.h>
55#include <grp.h>
56#include <pwd.h>
57#include <string.h>
58
59static void
60usage()
61{
62
63	(void)fprintf(stderr,
64	    "usage: mknod name [b | c] major minor [owner:group]\n");
65	exit(1);
66}
67
68static u_long
69id(name, type)
70	char *name, *type;
71{
72	u_long val;
73	char *ep;
74
75	/*
76	 * XXX
77	 * We know that uid_t's and gid_t's are unsigned longs.
78	 */
79	errno = 0;
80	val = strtoul(name, &ep, 10);
81	if (errno)
82		err(1, "%s", name);
83	if (*ep != '\0')
84		errx(1, "%s: illegal %s name", name, type);
85	return (val);
86}
87
88static gid_t
89a_gid(s)
90	char *s;
91{
92	struct group *gr;
93
94	if (*s == '\0')			/* Argument was "uid[:.]". */
95		errx(1, "group must be specified when the owner is");
96	return ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
97}
98
99static uid_t
100a_uid(s)
101	char *s;
102{
103	struct passwd *pw;
104
105	if (*s == '\0')			/* Argument was "[:.]gid". */
106		errx(1, "owner must be specified when the group is");
107	return ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
108}
109
110int
111main(argc, argv)
112	int argc;
113	char **argv;
114{
115	int range_error;
116	uid_t uid;
117	gid_t gid;
118	mode_t mode;
119	dev_t dev;
120	char *cp, *endp;
121	long mymajor, myminor;
122
123	if (argc != 5 && argc != 6)
124		usage();
125
126	mode = 0666;
127	if (argv[2][0] == 'c')
128		mode |= S_IFCHR;
129	else if (argv[2][0] == 'b')
130		mode |= S_IFBLK;
131	else
132		errx(1, "node must be type 'b' or 'c'");
133
134	errno = 0;
135	mymajor = (long)strtoul(argv[3], &endp, 0);
136	if (endp == argv[3] || *endp != '\0')
137		errx(1, "%s: non-numeric major number", argv[3]);
138	range_error = errno;
139	errno = 0;
140	myminor = (long)strtoul(argv[4], &endp, 0);
141	if (endp == argv[4] || *endp != '\0')
142		errx(1, "%s: non-numeric minor number", argv[4]);
143	range_error |= errno;
144	dev = makedev(mymajor, myminor);
145	if (range_error || major(dev) != (u_int) mymajor ||
146	    minor(dev) != (u_int) myminor)
147		errx(1, "major or minor number too large");
148
149	uid = gid = -1;
150	if (6 == argc) {
151	    	/* have owner:group */
152		if ((cp = strchr(argv[5], ':')) != NULL) {
153			*cp++ = '\0';
154			gid = a_gid(cp);
155		} else
156		usage();
157		uid = a_uid(argv[5]);
158	}
159
160	if (mknod(argv[1], mode, dev) != 0)
161		err(1, "%s", argv[1]);
162	if (6 == argc)
163		if (chown(argv[1], uid, gid))
164			err(1, "setting ownership on %s", argv[1]);
165	exit(0);
166}
167