1 %{ 2 /* 3 * parser.y 4 * 5 * Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com> 6 * All rights reserved. 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 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Id: parser.y,v 1.5 2003/06/07 21:22:30 max Exp $ 30 * $FreeBSD: src/usr.sbin/bluetooth/hcsecd/parser.y,v 1.4 2004/09/14 20:04:33 emax Exp $ 31 * $DragonFly: src/usr.sbin/bthcid/parser.y,v 1.1 2008/01/30 14:10:19 hasso Exp $ 32 */ 33 34 #include <sys/fcntl.h> 35 #include <sys/queue.h> 36 #include <bluetooth.h> 37 #include <errno.h> 38 #include <limits.h> 39 #include <stdio.h> 40 #include <stdarg.h> 41 #include <string.h> 42 #include <syslog.h> 43 #include <unistd.h> 44 #include "bthcid.h" 45 46 int yyparse (void); 47 int yylex (void); 48 49 static void free_key (link_key_p key); 50 static int hexa2int4(char *a); 51 static int hexa2int8(char *a); 52 53 extern int yylineno; 54 static LIST_HEAD(, link_key) link_keys; 55 char *config_file = "/etc/bluetooth/bthcid.conf"; 56 57 static link_key_p key = NULL; 58 %} 59 60 %union { 61 char *string; 62 } 63 64 %token <string> T_BDADDRSTRING T_HEXSTRING T_STRING 65 %token T_DEVICE T_BDADDR T_NAME T_KEY T_PIN T_NOKEY T_NOPIN T_JUNK 66 67 %% 68 69 config: line 70 | config line 71 ; 72 73 line: T_DEVICE 74 { 75 key = (link_key_p) malloc(sizeof(*key)); 76 if (key == NULL) { 77 syslog(LOG_ERR, "Could not allocate new " \ 78 "config entry"); 79 exit(1); 80 } 81 82 memset(key, 0, sizeof(*key)); 83 } 84 '{' options '}' 85 { 86 if (get_key(&key->bdaddr, 1) != NULL) { 87 syslog(LOG_ERR, "Ignoring duplicated entry " \ 88 "for bdaddr %s", 89 bt_ntoa(&key->bdaddr, NULL)); 90 free_key(key); 91 } else 92 LIST_INSERT_HEAD(&link_keys, key, next); 93 94 key = NULL; 95 } 96 ; 97 98 options: option ';' 99 | options option ';' 100 ; 101 102 option: bdaddr 103 | name 104 | key 105 | pin 106 ; 107 108 bdaddr: T_BDADDR T_BDADDRSTRING 109 { 110 if (!bt_aton($2, &key->bdaddr)) { 111 syslog(LOG_ERR, "Could not parse BD_ADDR " \ 112 "'%s'", $2); 113 exit(1); 114 } 115 } 116 ; 117 118 name: T_NAME T_STRING 119 { 120 if (key->name != NULL) 121 free(key->name); 122 123 key->name = strdup($2); 124 if (key->name == NULL) { 125 syslog(LOG_ERR, "Could not allocate new " \ 126 "device name"); 127 exit(1); 128 } 129 } 130 ; 131 132 key: T_KEY T_HEXSTRING 133 { 134 int i, len; 135 136 if (key->key != NULL) 137 free(key->key); 138 139 key->key = (uint8_t *) malloc(HCI_KEY_SIZE); 140 if (key->key == NULL) { 141 syslog(LOG_ERR, "Could not allocate new " \ 142 "link key"); 143 exit(1); 144 } 145 146 memset(key->key, 0, HCI_KEY_SIZE); 147 148 len = strlen($2) / 2; 149 if (len > HCI_KEY_SIZE) 150 len = HCI_KEY_SIZE; 151 152 for (i = 0; i < len; i ++) 153 key->key[i] = hexa2int8((char *)($2) + 2*i); 154 } 155 | T_KEY T_NOKEY 156 { 157 if (key->key != NULL) 158 free(key->key); 159 160 key->key = NULL; 161 } 162 ; 163 164 pin: T_PIN T_STRING 165 { 166 if (key->pin != NULL) 167 free(key->pin); 168 169 key->pin = strdup($2); 170 if (key->pin == NULL) { 171 syslog(LOG_ERR, "Could not allocate new " \ 172 "PIN code"); 173 exit(1); 174 } 175 } 176 | T_PIN T_NOPIN 177 { 178 if (key->pin != NULL) 179 free(key->pin); 180 181 key->pin = NULL; 182 } 183 ; 184 185 %% 186 187 /* Display parser error message */ 188 void 189 yyerror(char const *message) 190 { 191 syslog(LOG_ERR, "%s in line %d", message, yylineno); 192 } 193 194 /* Re-read config file */ 195 void 196 read_config_file(void) 197 { 198 extern FILE *yyin; 199 200 if (config_file == NULL) { 201 syslog(LOG_ERR, "Unknown config file name!"); 202 exit(1); 203 } 204 205 if ((yyin = fopen(config_file, "r")) == NULL) { 206 syslog(LOG_ERR, "Could not open config file '%s'. %s (%d)", 207 config_file, strerror(errno), errno); 208 exit(1); 209 } 210 211 clean_config(); 212 if (yyparse() < 0) { 213 syslog(LOG_ERR, "Could not parse config file '%s'",config_file); 214 exit(1); 215 } 216 217 fclose(yyin); 218 yyin = NULL; 219 220 #if __config_debug__ 221 dump_config(); 222 #endif 223 } 224 225 /* Clean config */ 226 void 227 clean_config(void) 228 { 229 link_key_p key = NULL; 230 231 while ((key = LIST_FIRST(&link_keys)) != NULL) { 232 LIST_REMOVE(key, next); 233 free_key(key); 234 } 235 } 236 237 /* Find link key entry in the list. Return exact or default match */ 238 link_key_p 239 get_key(bdaddr_p bdaddr, int exact_match) 240 { 241 link_key_p key = NULL, defkey = NULL; 242 243 LIST_FOREACH(key, &link_keys, next) { 244 if (memcmp(bdaddr, &key->bdaddr, sizeof(key->bdaddr)) == 0) 245 break; 246 247 if (!exact_match) 248 if (memcmp(BDADDR_ANY, &key->bdaddr, 249 sizeof(key->bdaddr)) == 0) 250 defkey = key; 251 } 252 253 return ((key != NULL)? key : defkey); 254 } 255 256 #if __config_debug__ 257 /* Dump config */ 258 void 259 dump_config(void) 260 { 261 link_key_p key = NULL; 262 char buffer[64]; 263 264 LIST_FOREACH(key, &link_keys, next) { 265 if (key->key != NULL) 266 snprintf(buffer, sizeof(buffer), 267 "0x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", 268 key->key[0], key->key[1], key->key[2], 269 key->key[3], key->key[4], key->key[5], 270 key->key[6], key->key[7], key->key[8], 271 key->key[9], key->key[10], key->key[11], 272 key->key[12], key->key[13], key->key[14], 273 key->key[15]); 274 275 syslog(LOG_DEBUG, 276 "device %s " \ 277 "bdaddr %s " \ 278 "pin %s " \ 279 "key %s", 280 (key->name != NULL)? key->name : "noname", 281 bt_ntoa(&key->bdaddr, NULL), 282 (key->pin != NULL)? key->pin : "nopin", 283 (key->key != NULL)? buffer : "nokey"); 284 } 285 } 286 #endif 287 288 /* Read keys file */ 289 int 290 read_keys_file(void) 291 { 292 FILE *f = NULL; 293 link_key_t *key = NULL; 294 char buf[BTHCID_BUFFER_SIZE], *p = NULL, *cp = NULL; 295 bdaddr_t bdaddr; 296 int i, len; 297 298 if ((f = fopen(BTHCID_KEYSFILE, "r")) == NULL) { 299 if (errno == ENOENT) 300 return (0); 301 302 syslog(LOG_ERR, "Could not open keys file %s. %s (%d)\n", 303 BTHCID_KEYSFILE, strerror(errno), errno); 304 305 return (-1); 306 } 307 308 while ((p = fgets(buf, sizeof(buf), f)) != NULL) { 309 if (*p == '#') 310 continue; 311 if ((cp = strpbrk(p, " ")) == NULL) 312 continue; 313 314 *cp++ = '\0'; 315 316 if (!bt_aton(p, &bdaddr)) 317 continue; 318 319 if ((key = get_key(&bdaddr, 1)) == NULL) 320 continue; 321 322 if (key->key == NULL) { 323 key->key = (uint8_t *) malloc(HCI_KEY_SIZE); 324 if (key->key == NULL) { 325 syslog(LOG_ERR, "Could not allocate link key"); 326 exit(1); 327 } 328 } 329 330 memset(key->key, 0, HCI_KEY_SIZE); 331 332 len = strlen(cp) / 2; 333 if (len > HCI_KEY_SIZE) 334 len = HCI_KEY_SIZE; 335 336 for (i = 0; i < len; i ++) 337 key->key[i] = hexa2int8(cp + 2*i); 338 339 syslog(LOG_DEBUG, "Restored link key for the entry, " \ 340 "remote bdaddr %s, name '%s'", 341 bt_ntoa(&key->bdaddr, NULL), 342 (key->name != NULL)? key->name : "No name"); 343 } 344 345 fclose(f); 346 347 return (0); 348 } 349 350 /* Dump keys file */ 351 int 352 dump_keys_file(void) 353 { 354 link_key_p key = NULL; 355 char tmp[PATH_MAX], buf[BTHCID_BUFFER_SIZE]; 356 int f; 357 358 snprintf(tmp, sizeof(tmp), "%s.tmp", BTHCID_KEYSFILE); 359 if ((f = open(tmp, O_RDWR|O_CREAT|O_TRUNC|O_EXCL, 0600)) < 0) { 360 syslog(LOG_ERR, "Could not create temp keys file %s. %s (%d)\n", 361 tmp, strerror(errno), errno); 362 return (-1); 363 } 364 365 LIST_FOREACH(key, &link_keys, next) { 366 if (key->key == NULL) 367 continue; 368 369 snprintf(buf, sizeof(buf), 370 "%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n", 371 bt_ntoa(&key->bdaddr, NULL), 372 key->key[0], key->key[1], key->key[2], key->key[3], 373 key->key[4], key->key[5], key->key[6], key->key[7], 374 key->key[8], key->key[9], key->key[10], key->key[11], 375 key->key[12], key->key[13], key->key[14], key->key[15]); 376 377 if (write(f, buf, strlen(buf)) < 0) { 378 syslog(LOG_ERR, "Could not write temp keys file. " \ 379 "%s (%d)\n", strerror(errno), errno); 380 break; 381 } 382 } 383 384 close(f); 385 386 if (rename(tmp, BTHCID_KEYSFILE) < 0) { 387 syslog(LOG_ERR, "Could not rename(%s, %s). %s (%d)\n", 388 tmp, BTHCID_KEYSFILE, strerror(errno), errno); 389 unlink(tmp); 390 return (-1); 391 } 392 393 return (0); 394 } 395 396 /* Free key entry */ 397 static void 398 free_key(link_key_p key) 399 { 400 if (key->name != NULL) 401 free(key->name); 402 if (key->key != NULL) 403 free(key->key); 404 if (key->pin != NULL) 405 free(key->pin); 406 407 memset(key, 0, sizeof(*key)); 408 free(key); 409 } 410 411 /* Convert hex ASCII to int4 */ 412 static int 413 hexa2int4(char *a) 414 { 415 if ('0' <= *a && *a <= '9') 416 return (*a - '0'); 417 418 if ('A' <= *a && *a <= 'F') 419 return (*a - 'A' + 0xa); 420 421 if ('a' <= *a && *a <= 'f') 422 return (*a - 'a' + 0xa); 423 424 syslog(LOG_ERR, "Invalid hex character: '%c' (%#x)", *a, *a); 425 exit(1); 426 } 427 428 /* Convert hex ASCII to int8 */ 429 static int 430 hexa2int8(char *a) 431 { 432 return ((hexa2int4(a) << 4) | hexa2int4(a + 1)); 433 } 434 435