xref: /freebsd/sbin/mknod/mknod.c (revision 9336e0699bda8a301cd2bfa37106b6ec5e32012e)
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
34 static 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
41 static char sccsid[] = "@(#)mknod.c	8.1 (Berkeley) 6/5/93";
42 #endif
43 static const char rcsid[] =
44   "$FreeBSD$";
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 
59 static void
60 usage(void)
61 {
62 
63 	(void)fprintf(stderr,
64 	    "usage: mknod name [b | c] major minor [owner:group]\n");
65 	exit(1);
66 }
67 
68 static u_long
69 id(const char *name, const char *type)
70 {
71 	u_long val;
72 	char *ep;
73 
74 	/*
75 	 * XXX
76 	 * We know that uid_t's and gid_t's are unsigned longs.
77 	 */
78 	errno = 0;
79 	val = strtoul(name, &ep, 10);
80 	if (errno)
81 		err(1, "%s", name);
82 	if (*ep != '\0')
83 		errx(1, "%s: illegal %s name", name, type);
84 	return (val);
85 }
86 
87 static gid_t
88 a_gid(const char *s)
89 {
90 	struct group *gr;
91 
92 	if (*s == '\0')			/* Argument was "uid[:.]". */
93 		errx(1, "group must be specified when the owner is");
94 	return ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
95 }
96 
97 static uid_t
98 a_uid(const char *s)
99 {
100 	struct passwd *pw;
101 
102 	if (*s == '\0')			/* Argument was "[:.]gid". */
103 		errx(1, "owner must be specified when the group is");
104 	return ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
105 }
106 
107 int
108 main(int argc, char **argv)
109 {
110 	int range_error;
111 	uid_t uid;
112 	gid_t gid;
113 	mode_t mode;
114 	dev_t dev;
115 	char *cp, *endp;
116 	long mymajor, myminor;
117 
118 	if (argc != 5 && argc != 6)
119 		usage();
120 
121 	mode = 0666;
122 	if (argv[2][0] == 'c')
123 		mode |= S_IFCHR;
124 	else if (argv[2][0] == 'b')
125 		mode |= S_IFBLK;
126 	else
127 		errx(1, "node must be type 'b' or 'c'");
128 
129 	errno = 0;
130 	mymajor = (long)strtoul(argv[3], &endp, 0);
131 	if (endp == argv[3] || *endp != '\0')
132 		errx(1, "%s: non-numeric major number", argv[3]);
133 	range_error = errno;
134 	errno = 0;
135 	myminor = (long)strtoul(argv[4], &endp, 0);
136 	if (endp == argv[4] || *endp != '\0')
137 		errx(1, "%s: non-numeric minor number", argv[4]);
138 	range_error |= errno;
139 	dev = makedev(mymajor, myminor);
140 	if (range_error || major(dev) != (u_int) mymajor ||
141 	    (long)(u_int)minor(dev) != myminor)
142 		errx(1, "major or minor number too large");
143 
144 	uid = gid = -1;
145 	if (6 == argc) {
146 	    	/* have owner:group */
147 		if ((cp = strchr(argv[5], ':')) != NULL) {
148 			*cp++ = '\0';
149 			gid = a_gid(cp);
150 		} else
151 		usage();
152 		uid = a_uid(argv[5]);
153 	}
154 
155 	if (mknod(argv[1], mode, dev) != 0)
156 		err(1, "%s", argv[1]);
157 	if (6 == argc)
158 		if (chown(argv[1], uid, gid))
159 			err(1, "setting ownership on %s", argv[1]);
160 	exit(0);
161 }
162