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 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 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 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 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 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