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mknod.c revision 1.36 
      1 /*	$NetBSD: mknod.c,v 1.36 2007/07/07 20:11:07 dsl Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998, 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Charles M. Hannum.
      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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #if HAVE_NBTOOL_CONFIG_H
     40 #include "nbtool_config.h"
     41 #endif
     42 
     43 #include <sys/cdefs.h>
     44 #ifndef lint
     45 __COPYRIGHT("@(#) Copyright (c) 1998 The NetBSD Foundation, Inc.  All rights reserved.\n");
     46 __RCSID("$NetBSD: mknod.c,v 1.36 2007/07/07 20:11:07 dsl Exp $");
     47 #endif /* not lint */
     48 
     49 #include <sys/types.h>
     50 #include <sys/stat.h>
     51 #include <sys/param.h>
     52 #if !HAVE_NBTOOL_CONFIG_H
     53 #include <sys/sysctl.h>
     54 #endif
     55 
     56 #include <err.h>
     57 #include <errno.h>
     58 #include <limits.h>
     59 #include <stdio.h>
     60 #include <stdlib.h>
     61 #include <unistd.h>
     62 #include <pwd.h>
     63 #include <grp.h>
     64 #include <string.h>
     65 #include <ctype.h>
     66 
     67 #include "pack_dev.h"
     68 
     69 static int gid_name(const char *, gid_t *);
     70 static portdev_t callPack(pack_t *, int, u_long *);
     71 
     72 	int	main(int, char *[]);
     73 static	void	usage(void);
     74 
     75 #ifdef KERN_DRIVERS
     76 static struct kinfo_drivers *kern_drivers;
     77 static int num_drivers;
     78 
     79 static void get_device_info(void);
     80 static void print_device_info(char **);
     81 static int major_from_name(const char *, mode_t);
     82 #endif
     83 
     84 #define	MAXARGS	3		/* 3 for bsdos, 2 for rest */
     85 
     86 int
     87 main(int argc, char **argv)
     88 {
     89 	char	*name, *p;
     90 	mode_t	 mode;
     91 	portdev_t	 dev;
     92 	pack_t	*pack;
     93 	u_long	 numbers[MAXARGS];
     94 	int	 n, ch, fifo, hasformat;
     95 	int	 r_flag = 0;		/* force: delete existing entry */
     96 #ifdef KERN_DRIVERS
     97 	int	 l_flag = 0;		/* list device names and numbers */
     98 	int	 major;
     99 #endif
    100 	void	*modes = 0;
    101 	uid_t	 uid = -1;
    102 	gid_t	 gid = -1;
    103 	int	 rval;
    104 
    105 	dev = 0;
    106 	fifo = hasformat = 0;
    107 	pack = pack_native;
    108 
    109 #ifdef KERN_DRIVERS
    110 	while ((ch = getopt(argc, argv, "lrRF:g:m:u:")) != -1) {
    111 #else
    112 	while ((ch = getopt(argc, argv, "rRF:g:m:u:")) != -1) {
    113 #endif
    114 		switch (ch) {
    115 
    116 #ifdef KERN_DRIVERS
    117 		case 'l':
    118 			l_flag = 1;
    119 			break;
    120 #endif
    121 
    122 		case 'r':
    123 			r_flag = 1;
    124 			break;
    125 
    126 		case 'R':
    127 			r_flag = 2;
    128 			break;
    129 
    130 		case 'F':
    131 			pack = pack_find(optarg);
    132 			if (pack == NULL)
    133 				errx(1, "invalid format: %s", optarg);
    134 			hasformat++;
    135 			break;
    136 
    137 		case 'g':
    138 			if (optarg[0] == '#') {
    139 				gid = strtol(optarg + 1, &p, 10);
    140 				if (*p == 0)
    141 					break;
    142 			}
    143 			if (gid_name(optarg, &gid) == 0)
    144 				break;
    145 			gid = strtol(optarg, &p, 10);
    146 			if (*p == 0)
    147 				break;
    148 			errx(1, "%s: invalid group name", optarg);
    149 
    150 		case 'm':
    151 			modes = setmode(optarg);
    152 			if (modes == NULL)
    153 				err(1, "Cannot set file mode `%s'", optarg);
    154 			break;
    155 
    156 		case 'u':
    157 			if (optarg[0] == '#') {
    158 				uid = strtol(optarg + 1, &p, 10);
    159 				if (*p == 0)
    160 					break;
    161 			}
    162 			if (uid_from_user(optarg, &uid) == 0)
    163 				break;
    164 			uid = strtol(optarg, &p, 10);
    165 			if (*p == 0)
    166 				break;
    167 			errx(1, "%s: invalid user name", optarg);
    168 
    169 		default:
    170 		case '?':
    171 			usage();
    172 		}
    173 	}
    174 	argc -= optind;
    175 	argv += optind;
    176 
    177 #ifdef KERN_DRIVERS
    178 	if (l_flag) {
    179 		print_device_info(argv);
    180 		return 0;
    181 	}
    182 #endif
    183 
    184 	if (argc < 2 || argc > 10)
    185 		usage();
    186 
    187 	name = *argv;
    188 	argc--;
    189 	argv++;
    190 
    191 	umask(mode = umask(0));
    192 	mode = (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) & ~mode;
    193 
    194 	if (argv[0][1] != '\0')
    195 		goto badtype;
    196 	switch (*argv[0]) {
    197 	case 'c':
    198 		mode |= S_IFCHR;
    199 		break;
    200 
    201 	case 'b':
    202 		mode |= S_IFBLK;
    203 		break;
    204 
    205 	case 'p':
    206 		if (hasformat)
    207 			errx(1, "format is meaningless for fifos");
    208 		mode |= S_IFIFO;
    209 		fifo = 1;
    210 		break;
    211 
    212 	default:
    213  badtype:
    214 		errx(1, "node type must be 'b', 'c' or 'p'.");
    215 	}
    216 	argc--;
    217 	argv++;
    218 
    219 	if (fifo) {
    220 		if (argc != 0)
    221 			usage();
    222 	} else {
    223 		if (argc < 1 || argc > MAXARGS)
    224 			usage();
    225 	}
    226 
    227 	for (n = 0; n < argc; n++) {
    228 		errno = 0;
    229 		numbers[n] = strtoul(argv[n], &p, 0);
    230 		if (*p == 0 && errno == 0)
    231 			continue;
    232 #ifdef KERN_DRIVERS
    233 		if (n == 0) {
    234 			major = major_from_name(argv[0], mode);
    235 			if (major != -1) {
    236 				numbers[0] = major;
    237 				continue;
    238 			}
    239 			if (!isdigit(*(unsigned char *)argv[0]))
    240 				errx(1, "unknown driver: %s", argv[0]);
    241 		}
    242 #endif
    243 		errx(1, "invalid number: %s", argv[n]);
    244 	}
    245 
    246 	switch (argc) {
    247 	case 0:
    248 		dev = 0;
    249 		break;
    250 
    251 	case 1:
    252 		dev = numbers[0];
    253 		break;
    254 
    255 	default:
    256 		dev = callPack(pack, argc, numbers);
    257 		break;
    258 	}
    259 
    260 	if (modes != NULL)
    261 		mode = getmode(modes, mode);
    262 	umask(0);
    263 	rval = fifo ? mkfifo(name, mode) : mknod(name, mode, dev);
    264 	if (rval < 0 && errno == EEXIST && r_flag) {
    265 		struct stat sb;
    266 		if (lstat(name, &sb) != 0 || (!fifo && sb.st_rdev != dev))
    267 			sb.st_mode = 0;
    268 
    269 		if ((sb.st_mode & S_IFMT) == (mode & S_IFMT)) {
    270 			if (r_flag == 1)
    271 				/* Ignore permissions and user/group */
    272 				return 0;
    273 			if (sb.st_mode != mode)
    274 				rval = chmod(name, mode);
    275 			else
    276 				rval = 0;
    277 		} else {
    278 			unlink(name);
    279 			rval = fifo ? mkfifo(name, mode)
    280 				    : mknod(name, mode, dev);
    281 		}
    282 	}
    283 	if (rval < 0)
    284 		err(1, "%s", name);
    285 	if ((uid != -1 || gid != -1) && chown(name, uid, gid) == -1)
    286 		/* XXX Should we unlink the files here? */
    287 		warn("%s: uid/gid not changed", name);
    288 
    289 	return 0;
    290 }
    291 
    292 static void
    293 usage(void)
    294 {
    295 	const char *progname = getprogname();
    296 
    297 	(void)fprintf(stderr,
    298 	    "usage: %s [-rR] [-F format] [-m mode] [-u user] [-g group]\n",
    299 	    progname);
    300 	(void)fprintf(stderr,
    301 #ifdef KERN_DRIVERS
    302 	    "                   [ name [b | c] [major | driver] minor\n"
    303 #else
    304 	    "                   [ name [b | c] major minor\n"
    305 #endif
    306 	    "                   | name [b | c] major unit subunit\n"
    307 	    "                   | name [b | c] number\n"
    308 	    "                   | name p ]\n");
    309 #ifdef KERN_DRIVERS
    310 	(void)fprintf(stderr, "       %s -l [driver] ...\n", progname);
    311 #endif
    312 	exit(1);
    313 }
    314 
    315 static int
    316 gid_name(const char *name, gid_t *gid)
    317 {
    318 	struct group *g;
    319 
    320 	g = getgrnam(name);
    321 	if (!g)
    322 		return -1;
    323 	*gid = g->gr_gid;
    324 	return 0;
    325 }
    326 
    327 static portdev_t
    328 callPack(pack_t *f, int n, u_long *numbers)
    329 {
    330 	portdev_t d;
    331 	const char *error = NULL;
    332 
    333 	d = (*f)(n, numbers, &error);
    334 	if (error != NULL)
    335 		errx(1, "%s", error);
    336 	return d;
    337 }
    338 
    339 #ifdef KERN_DRIVERS
    340 static void
    341 get_device_info(void)
    342 {
    343 	static int mib[2] = {CTL_KERN, KERN_DRIVERS};
    344 	size_t len;
    345 
    346 	if (sysctl(mib, 2, NULL, &len, NULL, 0) != 0)
    347 		err(1, "kern.drivers" );
    348 	kern_drivers = malloc(len);
    349 	if (kern_drivers == NULL)
    350 		err(1, "malloc");
    351 	if (sysctl(mib, 2, kern_drivers, &len, NULL, 0) != 0)
    352 		err(1, "kern.drivers" );
    353 
    354 	num_drivers = len / sizeof *kern_drivers;
    355 }
    356 
    357 static void
    358 print_device_info(char **names)
    359 {
    360 	int i;
    361 	struct kinfo_drivers *kd;
    362 
    363 	if (kern_drivers == NULL)
    364 		get_device_info();
    365 
    366 	do {
    367 		kd = kern_drivers;
    368 		for (i = 0; i < num_drivers; kd++, i++) {
    369 			if (*names && strcmp(*names, kd->d_name))
    370 				continue;
    371 			printf("%s", kd->d_name);
    372 			if (kd->d_cmajor != -1)
    373 				printf(" character major %d", kd->d_cmajor);
    374 			if (kd->d_bmajor != -1)
    375 				printf(" block major %d", kd->d_bmajor);
    376 			printf("\n");
    377 		}
    378 	} while (*names && *++names);
    379 }
    380 
    381 static int
    382 major_from_name(const char *name, mode_t mode)
    383 {
    384 	int i;
    385 	struct kinfo_drivers *kd;
    386 
    387 	if (kern_drivers == NULL)
    388 		get_device_info();
    389 
    390 	kd = kern_drivers;
    391 	for (i = 0; i < num_drivers; kd++, i++) {
    392 		if (strcmp(name, kd->d_name))
    393 			continue;
    394 		if (S_ISCHR(mode))
    395 			return kd->d_cmajor;
    396 		return kd->d_bmajor;
    397 	}
    398 	return -1;
    399 }
    400 #endif
    401