04e532d50b
In 99% of the cases people just want to recreate device nodes they removed from /dev. There is no reason to pass the additional "c 0 0" anymore. Also slightly improve the manpage. Remove references to non-existent device names and platforms.
168 lines
4.3 KiB
C
168 lines
4.3 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kevin Fall.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)mknod.c 8.1 (Berkeley) 6/5/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <grp.h>
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#include <pwd.h>
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#include <string.h>
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: mknod name\n"
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" mknod name [b | c] major minor [owner:group]\n");
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exit(1);
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}
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static u_long
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id(const char *name, const char *type)
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{
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u_long val;
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char *ep;
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/*
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* XXX
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* We know that uid_t's and gid_t's are unsigned longs.
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*/
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errno = 0;
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val = strtoul(name, &ep, 10);
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if (errno)
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err(1, "%s", name);
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if (*ep != '\0')
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errx(1, "%s: illegal %s name", name, type);
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return (val);
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}
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static gid_t
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a_gid(const char *s)
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{
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struct group *gr;
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if (*s == '\0') /* Argument was "uid[:.]". */
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errx(1, "group must be specified when the owner is");
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return ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
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}
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static uid_t
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a_uid(const char *s)
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{
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struct passwd *pw;
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if (*s == '\0') /* Argument was "[:.]gid". */
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errx(1, "owner must be specified when the group is");
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return ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
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}
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int
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main(int argc, char **argv)
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{
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int range_error;
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uid_t uid;
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gid_t gid;
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mode_t mode;
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dev_t dev;
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char *cp, *endp;
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long mymajor, myminor;
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if (argc != 2 && argc != 5 && argc != 6)
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usage();
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if (argc >= 5) {
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mode = 0666;
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if (argv[2][0] == 'c')
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mode |= S_IFCHR;
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else if (argv[2][0] == 'b')
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mode |= S_IFBLK;
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else
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errx(1, "node must be type 'b' or 'c'");
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errno = 0;
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mymajor = (long)strtoul(argv[3], &endp, 0);
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if (endp == argv[3] || *endp != '\0')
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errx(1, "%s: non-numeric major number", argv[3]);
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range_error = errno;
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errno = 0;
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myminor = (long)strtoul(argv[4], &endp, 0);
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if (endp == argv[4] || *endp != '\0')
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errx(1, "%s: non-numeric minor number", argv[4]);
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range_error |= errno;
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dev = makedev(mymajor, myminor);
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if (range_error || major(dev) != (u_int) mymajor ||
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(long)(u_int)minor(dev) != myminor)
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errx(1, "major or minor number too large");
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} else {
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mode = 0666 | S_IFCHR;
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dev = 0;
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}
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uid = gid = -1;
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if (6 == argc) {
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/* have owner:group */
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if ((cp = strchr(argv[5], ':')) != NULL) {
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*cp++ = '\0';
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gid = a_gid(cp);
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} else
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usage();
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uid = a_uid(argv[5]);
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}
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if (mknod(argv[1], mode, dev) != 0)
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err(1, "%s", argv[1]);
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if (6 == argc)
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if (chown(argv[1], uid, gid))
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err(1, "setting ownership on %s", argv[1]);
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exit(0);
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}
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