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 #include <sys/types.h>
36 #include <sys/stat.h>
37
38 #include <err.h>
39 #include <errno.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <unistd.h>
43 #include <grp.h>
44 #include <pwd.h>
45 #include <string.h>
46
47 static void
usage(void)48 usage(void)
49 {
50
51 (void)fprintf(stderr,
52 "usage: mknod name\n"
53 " mknod name [b | c] major minor [owner:group]\n");
54 exit(1);
55 }
56
57 static u_long
id(const char * name,const char * type)58 id(const char *name, const char *type)
59 {
60 u_long val;
61 char *ep;
62
63 /*
64 * XXX
65 * We know that uid_t's and gid_t's are unsigned longs.
66 */
67 errno = 0;
68 val = strtoul(name, &ep, 10);
69 if (errno)
70 err(1, "%s", name);
71 if (*ep != '\0')
72 errx(1, "%s: illegal %s name", name, type);
73 return (val);
74 }
75
76 static gid_t
a_gid(const char * s)77 a_gid(const char *s)
78 {
79 struct group *gr;
80
81 if (*s == '\0') /* Argument was "uid[:.]". */
82 errx(1, "group must be specified when the owner is");
83 return ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
84 }
85
86 static uid_t
a_uid(const char * s)87 a_uid(const char *s)
88 {
89 struct passwd *pw;
90
91 if (*s == '\0') /* Argument was "[:.]gid". */
92 errx(1, "owner must be specified when the group is");
93 return ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
94 }
95
96 int
main(int argc,char ** argv)97 main(int argc, char **argv)
98 {
99 int range_error;
100 uid_t uid;
101 gid_t gid;
102 mode_t mode;
103 dev_t dev;
104 char *cp, *endp;
105 long mymajor, myminor;
106
107 if (argc != 2 && argc != 5 && argc != 6)
108 usage();
109
110 if (argc >= 5) {
111 mode = 0666;
112 if (argv[2][0] == 'c')
113 mode |= S_IFCHR;
114 else if (argv[2][0] == 'b')
115 mode |= S_IFBLK;
116 else
117 errx(1, "node must be type 'b' or 'c'");
118
119 errno = 0;
120 mymajor = (long)strtoul(argv[3], &endp, 0);
121 if (endp == argv[3] || *endp != '\0')
122 errx(1, "%s: non-numeric major number", argv[3]);
123 range_error = errno;
124 errno = 0;
125 myminor = (long)strtoul(argv[4], &endp, 0);
126 if (endp == argv[4] || *endp != '\0')
127 errx(1, "%s: non-numeric minor number", argv[4]);
128 range_error |= errno;
129 dev = makedev(mymajor, myminor);
130 if (range_error || major(dev) != mymajor ||
131 (long)(u_int)minor(dev) != myminor)
132 errx(1, "major or minor number too large");
133 } else {
134 mode = 0666 | S_IFCHR;
135 dev = 0;
136 }
137
138 uid = gid = -1;
139 if (6 == argc) {
140 /* have owner:group */
141 if ((cp = strchr(argv[5], ':')) != NULL) {
142 *cp++ = '\0';
143 gid = a_gid(cp);
144 } else
145 usage();
146 uid = a_uid(argv[5]);
147 }
148
149 if (mknod(argv[1], mode, dev) != 0)
150 err(1, "%s", argv[1]);
151 if (6 == argc)
152 if (chown(argv[1], uid, gid))
153 err(1, "setting ownership on %s", argv[1]);
154 exit(0);
155 }
156