1 /* 2 * wpa_supplicant/hostapd / common helper functions, etc. 3 * Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include "includes.h" 16 17 #include "common.h" 18 19 20 static int hex2num(char c) 21 { 22 if (c >= '0' && c <= '9') 23 return c - '0'; 24 if (c >= 'a' && c <= 'f') 25 return c - 'a' + 10; 26 if (c >= 'A' && c <= 'F') 27 return c - 'A' + 10; 28 return -1; 29 } 30 31 32 static int hex2byte(const char *hex) 33 { 34 int a, b; 35 a = hex2num(*hex++); 36 if (a < 0) 37 return -1; 38 b = hex2num(*hex++); 39 if (b < 0) 40 return -1; 41 return (a << 4) | b; 42 } 43 44 45 /** 46 * hwaddr_aton - Convert ASCII string to MAC address (colon-delimited format) 47 * @txt: MAC address as a string (e.g., "00:11:22:33:44:55") 48 * @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes) 49 * Returns: 0 on success, -1 on failure (e.g., string not a MAC address) 50 */ 51 int hwaddr_aton(const char *txt, u8 *addr) 52 { 53 int i; 54 55 for (i = 0; i < 6; i++) { 56 int a, b; 57 58 a = hex2num(*txt++); 59 if (a < 0) 60 return -1; 61 b = hex2num(*txt++); 62 if (b < 0) 63 return -1; 64 *addr++ = (a << 4) | b; 65 if (i < 5 && *txt++ != ':') 66 return -1; 67 } 68 69 return 0; 70 } 71 72 73 /** 74 * hwaddr_aton2 - Convert ASCII string to MAC address (in any known format) 75 * @txt: MAC address as a string (e.g., 00:11:22:33:44:55 or 0011.2233.4455) 76 * @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes) 77 * Returns: Characters used (> 0) on success, -1 on failure 78 */ 79 int hwaddr_aton2(const char *txt, u8 *addr) 80 { 81 int i; 82 const char *pos = txt; 83 84 for (i = 0; i < 6; i++) { 85 int a, b; 86 87 while (*pos == ':' || *pos == '.' || *pos == '-') 88 pos++; 89 90 a = hex2num(*pos++); 91 if (a < 0) 92 return -1; 93 b = hex2num(*pos++); 94 if (b < 0) 95 return -1; 96 *addr++ = (a << 4) | b; 97 } 98 99 return pos - txt; 100 } 101 102 103 /** 104 * hexstr2bin - Convert ASCII hex string into binary data 105 * @hex: ASCII hex string (e.g., "01ab") 106 * @buf: Buffer for the binary data 107 * @len: Length of the text to convert in bytes (of buf); hex will be double 108 * this size 109 * Returns: 0 on success, -1 on failure (invalid hex string) 110 */ 111 int hexstr2bin(const char *hex, u8 *buf, size_t len) 112 { 113 size_t i; 114 int a; 115 const char *ipos = hex; 116 u8 *opos = buf; 117 118 for (i = 0; i < len; i++) { 119 a = hex2byte(ipos); 120 if (a < 0) 121 return -1; 122 *opos++ = a; 123 ipos += 2; 124 } 125 return 0; 126 } 127 128 129 /** 130 * inc_byte_array - Increment arbitrary length byte array by one 131 * @counter: Pointer to byte array 132 * @len: Length of the counter in bytes 133 * 134 * This function increments the last byte of the counter by one and continues 135 * rolling over to more significant bytes if the byte was incremented from 136 * 0xff to 0x00. 137 */ 138 void inc_byte_array(u8 *counter, size_t len) 139 { 140 int pos = len - 1; 141 while (pos >= 0) { 142 counter[pos]++; 143 if (counter[pos] != 0) 144 break; 145 pos--; 146 } 147 } 148 149 150 void wpa_get_ntp_timestamp(u8 *buf) 151 { 152 struct os_time now; 153 u32 sec, usec; 154 be32 tmp; 155 156 /* 64-bit NTP timestamp (time from 1900-01-01 00:00:00) */ 157 os_get_time(&now); 158 sec = now.sec + 2208988800U; /* Epoch to 1900 */ 159 /* Estimate 2^32/10^6 = 4295 - 1/32 - 1/512 */ 160 usec = now.usec; 161 usec = 4295 * usec - (usec >> 5) - (usec >> 9); 162 tmp = host_to_be32(sec); 163 os_memcpy(buf, (u8 *) &tmp, 4); 164 tmp = host_to_be32(usec); 165 os_memcpy(buf + 4, (u8 *) &tmp, 4); 166 } 167 168 169 static inline int _wpa_snprintf_hex(char *buf, size_t buf_size, const u8 *data, 170 size_t len, int uppercase) 171 { 172 size_t i; 173 char *pos = buf, *end = buf + buf_size; 174 int ret; 175 if (buf_size == 0) 176 return 0; 177 for (i = 0; i < len; i++) { 178 ret = os_snprintf(pos, end - pos, uppercase ? "%02X" : "%02x", 179 data[i]); 180 if (ret < 0 || ret >= end - pos) { 181 end[-1] = '\0'; 182 return pos - buf; 183 } 184 pos += ret; 185 } 186 end[-1] = '\0'; 187 return pos - buf; 188 } 189 190 /** 191 * wpa_snprintf_hex - Print data as a hex string into a buffer 192 * @buf: Memory area to use as the output buffer 193 * @buf_size: Maximum buffer size in bytes (should be at least 2 * len + 1) 194 * @data: Data to be printed 195 * @len: Length of data in bytes 196 * Returns: Number of bytes written 197 */ 198 int wpa_snprintf_hex(char *buf, size_t buf_size, const u8 *data, size_t len) 199 { 200 return _wpa_snprintf_hex(buf, buf_size, data, len, 0); 201 } 202 203 204 /** 205 * wpa_snprintf_hex_uppercase - Print data as a upper case hex string into buf 206 * @buf: Memory area to use as the output buffer 207 * @buf_size: Maximum buffer size in bytes (should be at least 2 * len + 1) 208 * @data: Data to be printed 209 * @len: Length of data in bytes 210 * Returns: Number of bytes written 211 */ 212 int wpa_snprintf_hex_uppercase(char *buf, size_t buf_size, const u8 *data, 213 size_t len) 214 { 215 return _wpa_snprintf_hex(buf, buf_size, data, len, 1); 216 } 217 218 219 #ifdef CONFIG_ANSI_C_EXTRA 220 221 #ifdef _WIN32_WCE 222 void perror(const char *s) 223 { 224 wpa_printf(MSG_ERROR, "%s: GetLastError: %d", 225 s, (int) GetLastError()); 226 } 227 #endif /* _WIN32_WCE */ 228 229 230 int optind = 1; 231 int optopt; 232 char *optarg; 233 234 int getopt(int argc, char *const argv[], const char *optstring) 235 { 236 static int optchr = 1; 237 char *cp; 238 239 if (optchr == 1) { 240 if (optind >= argc) { 241 /* all arguments processed */ 242 return EOF; 243 } 244 245 if (argv[optind][0] != '-' || argv[optind][1] == '\0') { 246 /* no option characters */ 247 return EOF; 248 } 249 } 250 251 if (os_strcmp(argv[optind], "--") == 0) { 252 /* no more options */ 253 optind++; 254 return EOF; 255 } 256 257 optopt = argv[optind][optchr]; 258 cp = os_strchr(optstring, optopt); 259 if (cp == NULL || optopt == ':') { 260 if (argv[optind][++optchr] == '\0') { 261 optchr = 1; 262 optind++; 263 } 264 return '?'; 265 } 266 267 if (cp[1] == ':') { 268 /* Argument required */ 269 optchr = 1; 270 if (argv[optind][optchr + 1]) { 271 /* No space between option and argument */ 272 optarg = &argv[optind++][optchr + 1]; 273 } else if (++optind >= argc) { 274 /* option requires an argument */ 275 return '?'; 276 } else { 277 /* Argument in the next argv */ 278 optarg = argv[optind++]; 279 } 280 } else { 281 /* No argument */ 282 if (argv[optind][++optchr] == '\0') { 283 optchr = 1; 284 optind++; 285 } 286 optarg = NULL; 287 } 288 return *cp; 289 } 290 #endif /* CONFIG_ANSI_C_EXTRA */ 291 292 293 #ifdef CONFIG_NATIVE_WINDOWS 294 /** 295 * wpa_unicode2ascii_inplace - Convert unicode string into ASCII 296 * @str: Pointer to string to convert 297 * 298 * This function converts a unicode string to ASCII using the same 299 * buffer for output. If UNICODE is not set, the buffer is not 300 * modified. 301 */ 302 void wpa_unicode2ascii_inplace(TCHAR *str) 303 { 304 #ifdef UNICODE 305 char *dst = (char *) str; 306 while (*str) 307 *dst++ = (char) *str++; 308 *dst = '\0'; 309 #endif /* UNICODE */ 310 } 311 312 313 TCHAR * wpa_strdup_tchar(const char *str) 314 { 315 #ifdef UNICODE 316 TCHAR *buf; 317 buf = os_malloc((strlen(str) + 1) * sizeof(TCHAR)); 318 if (buf == NULL) 319 return NULL; 320 wsprintf(buf, L"%S", str); 321 return buf; 322 #else /* UNICODE */ 323 return os_strdup(str); 324 #endif /* UNICODE */ 325 } 326 #endif /* CONFIG_NATIVE_WINDOWS */ 327 328 329 /** 330 * wpa_ssid_txt - Convert SSID to a printable string 331 * @ssid: SSID (32-octet string) 332 * @ssid_len: Length of ssid in octets 333 * Returns: Pointer to a printable string 334 * 335 * This function can be used to convert SSIDs into printable form. In most 336 * cases, SSIDs do not use unprintable characters, but IEEE 802.11 standard 337 * does not limit the used character set, so anything could be used in an SSID. 338 * 339 * This function uses a static buffer, so only one call can be used at the 340 * time, i.e., this is not re-entrant and the returned buffer must be used 341 * before calling this again. 342 */ 343 const char * wpa_ssid_txt(const u8 *ssid, size_t ssid_len) 344 { 345 static char ssid_txt[33]; 346 char *pos; 347 348 if (ssid_len > 32) 349 ssid_len = 32; 350 os_memcpy(ssid_txt, ssid, ssid_len); 351 ssid_txt[ssid_len] = '\0'; 352 for (pos = ssid_txt; *pos != '\0'; pos++) { 353 if ((u8) *pos < 32 || (u8) *pos >= 127) 354 *pos = '_'; 355 } 356 return ssid_txt; 357 } 358 359 360 void * __hide_aliasing_typecast(void *foo) 361 { 362 return foo; 363 } 364