sbin/mknod/mknod.c

   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  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  37  * @(#)mknod.c  8.1 (Berkeley) 6/5/93
  38  * $FreeBSD: src/sbin/mknod/mknod.c,v 1.13 2000/01/06 17:51:46 obrien Exp $
  39  * $DragonFly: src/sbin/mknod/mknod.c,v 1.5 2005/01/01 23:09:57 cpressey Exp $
  40  */
  41
  42 #include <sys/types.h>
  43 #include <sys/stat.h>
  44
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <unistd.h>
  50 #include <grp.h>
  51 #include <pwd.h>
  52 #include <string.h>
  53
  54 static void
  55 usage(void)
  56 {
  57
  58         fprintf(stderr,
  59             "usage: mknod name [b | c] major minor [owner:group]\n");
  60         exit(1);
  61 }
  62
  63 static u_long
  64 id(char *name, const char *type)
  65 {
  66         u_long val;
  67         char *ep;
  68
  69         /*
  70          * XXX
  71          * We know that uid_t's and gid_t's are unsigned longs.
  72          */
  73         errno = 0;
  74         val = strtoul(name, &ep, 10);
  75         if (errno)
  76                 err(1, "%s", name);
  77         if (*ep != '\0')
  78                 errx(1, "%s: illegal %s name", name, type);
  79         return (val);
  80 }
  81
  82 static gid_t
  83 a_gid(char *s)
  84 {
  85         struct group *gr;
  86
  87         if (*s == '\0')                 /* Argument was "uid[:.]". */
  88                 errx(1, "group must be specified when the owner is");
  89         return ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
  90 }
  91
  92 static uid_t
  93 a_uid(char *s)
  94 {
  95         struct passwd *pw;
  96
  97         if (*s == '\0')                 /* Argument was "[:.]gid". */
  98                 errx(1, "owner must be specified when the group is");
  99         return ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
 100 }
 101
 102 int
 103 main(int argc, char **argv)
 104 {
 105         int range_error;
 106         uid_t uid;
 107         gid_t gid;
 108         mode_t mode;
 109         dev_t dev;
 110         char *cp, *endp;
 111         long mymajor, myminor;
 112
 113         if (argc != 5 && argc != 6)
 114                 usage();
 115
 116         mode = 0666;
 117         if (argv[2][0] == 'c')
 118                 mode |= S_IFCHR;
 119         else if (argv[2][0] == 'b')
 120                 mode |= S_IFBLK;
 121         else
 122                 errx(1, "node must be type 'b' or 'c'");
 123
 124         errno = 0;
 125         mymajor = (long)strtoul(argv[3], &endp, 0);
 126         if (endp == argv[3] || *endp != '\0')
 127                 errx(1, "%s: non-numeric major number", argv[3]);
 128         range_error = errno;
 129         errno = 0;
 130         myminor = (long)strtoul(argv[4], &endp, 0);
 131         if (endp == argv[4] || *endp != '\0')
 132                 errx(1, "%s: non-numeric minor number", argv[4]);
 133         range_error |= errno;
 134         dev = makedev(mymajor, myminor);
 135         if (range_error || major(dev) != mymajor ||
 136             minor(dev) != myminor)
 137                 errx(1, "major or minor number too large");
 138
 139         uid = gid = -1;
 140         if (6 == argc) {
 141                 /* have owner:group */
 142                 if ((cp = strchr(argv[5], ':')) != NULL) {
 143                         *cp++ = '\0';
 144                         gid = a_gid(cp);
 145                 } else
 146                 usage();
 147                 uid = a_uid(argv[5]);
 148         }
 149
 150         if (mknod(argv[1], mode, dev) != 0)
 151                 err(1, "%s", argv[1]);
 152         if (6 == argc)
 153                 if (chown(argv[1], uid, gid))
 154                         err(1, "setting ownership on %s", argv[1]);
 155         exit(0);
 156 }