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