1 /* $NetBSD: mknod.c,v 1.35 2005/10/01 20:24:44 christos 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 1.35 2005/10/01 20:24:44 christos 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 (mode & S_IFCHR) 395 return kd->d_cmajor; 396 return kd->d_bmajor; 397 } 398 return -1; 399 } 400 #endif 401