/*
* wpa_supplicant/hostapd / common helper functions, etc.
* Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
static int hex2num(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
return -1;
}
int hex2byte(const char *hex)
{
int a, b;
a = hex2num(*hex++);
if (a < 0)
return -1;
b = hex2num(*hex++);
if (b < 0)
return -1;
return (a << 4) | b;
}
/**
* hwaddr_aton - Convert ASCII string to MAC address (colon-delimited format)
* @txt: MAC address as a string (e.g., "00:11:22:33:44:55")
* @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes)
* Returns: 0 on success, -1 on failure (e.g., string not a MAC address)
*/
int hwaddr_aton(const char *txt, u8 *addr)
{
int i;
for (i = 0; i < 6; i++) {
int a, b;
a = hex2num(*txt++);
if (a < 0)
return -1;
b = hex2num(*txt++);
if (b < 0)
return -1;
*addr++ = (a << 4) | b;
if (i < 5 && *txt++ != ':')
return -1;
}
return 0;
}
/**
* hwaddr_compact_aton - Convert ASCII string to MAC address (no colon delimitors format)
* @txt: MAC address as a string (e.g., "001122334455")
* @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes)
* Returns: 0 on success, -1 on failure (e.g., string not a MAC address)
*/
int hwaddr_compact_aton(const char *txt, u8 *addr)
{
int i;
for (i = 0; i < 6; i++) {
int a, b;
a = hex2num(*txt++);
if (a < 0)
return -1;
b = hex2num(*txt++);
if (b < 0)
return -1;
*addr++ = (a << 4) | b;
}
return 0;
}
/**
* hwaddr_aton2 - Convert ASCII string to MAC address (in any known format)
* @txt: MAC address as a string (e.g., 00:11:22:33:44:55 or 0011.2233.4455)
* @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes)
* Returns: Characters used (> 0) on success, -1 on failure
*/
int hwaddr_aton2(const char *txt, u8 *addr)
{
int i;
const char *pos = txt;
for (i = 0; i < 6; i++) {
int a, b;
while (*pos == ':' || *pos == '.' || *pos == '-')
pos++;
a = hex2num(*pos++);
if (a < 0)
return -1;
b = hex2num(*pos++);
if (b < 0)
return -1;
*addr++ = (a << 4) | b;
}
return pos - txt;
}
/**
* hexstr2bin - Convert ASCII hex string into binary data
* @hex: ASCII hex string (e.g., "01ab")
* @buf: Buffer for the binary data
* @len: Length of the text to convert in bytes (of buf); hex will be double
* this size
* Returns: 0 on success, -1 on failure (invalid hex string)
*/
int hexstr2bin(const char *hex, u8 *buf, size_t len)
{
size_t i;
int a;
const char *ipos = hex;
u8 *opos = buf;
for (i = 0; i < len; i++) {
a = hex2byte(ipos);
if (a < 0)
return -1;
*opos++ = a;
ipos += 2;
}
return 0;
}
/**
* inc_byte_array - Increment arbitrary length byte array by one
* @counter: Pointer to byte array
* @len: Length of the counter in bytes
*
* This function increments the last byte of the counter by one and continues
* rolling over to more significant bytes if the byte was incremented from
* 0xff to 0x00.
*/
void inc_byte_array(u8 *counter, size_t len)
{
int pos = len - 1;
while (pos >= 0) {
counter[pos]++;
if (counter[pos] != 0)
break;
pos--;
}
}
void wpa_get_ntp_timestamp(u8 *buf)
{
struct os_time now;
u32 sec, usec;
be32 tmp;
/* 64-bit NTP timestamp (time from 1900-01-01 00:00:00) */
os_get_time(&now);
sec = now.sec + 2208988800U; /* Epoch to 1900 */
/* Estimate 2^32/10^6 = 4295 - 1/32 - 1/512 */
usec = now.usec;
usec = 4295 * usec - (usec >> 5) - (usec >> 9);
tmp = host_to_be32(sec);
os_memcpy(buf, (u8 *) &tmp, 4);
tmp = host_to_be32(usec);
os_memcpy(buf + 4, (u8 *) &tmp, 4);
}
static inline int _wpa_snprintf_hex(char *buf, size_t buf_size, const u8 *data,
size_t len, int uppercase)
{
size_t i;
char *pos = buf, *end = buf + buf_size;
int ret;
if (buf_size == 0)
return 0;
for (i = 0; i < len; i++) {
ret = os_snprintf(pos, end - pos, uppercase ? "%02X" : "%02x",
data[i]);
if (ret < 0 || ret >= end - pos) {
end[-1] = '\0';
return pos - buf;
}
pos += ret;
}
end[-1] = '\0';
return pos - buf;
}
/**
* wpa_snprintf_hex - Print data as a hex string into a buffer
* @buf: Memory area to use as the output buffer
* @buf_size: Maximum buffer size in bytes (should be at least 2 * len + 1)
* @data: Data to be printed
* @len: Length of data in bytes
* Returns: Number of bytes written
*/
int wpa_snprintf_hex(char *buf, size_t buf_size, const u8 *data, size_t len)
{
return _wpa_snprintf_hex(buf, buf_size, data, len, 0);
}
/**
* wpa_snprintf_hex_uppercase - Print data as a upper case hex string into buf
* @buf: Memory area to use as the output buffer
* @buf_size: Maximum buffer size in bytes (should be at least 2 * len + 1)
* @data: Data to be printed
* @len: Length of data in bytes
* Returns: Number of bytes written
*/
int wpa_snprintf_hex_uppercase(char *buf, size_t buf_size, const u8 *data,
size_t len)
{
return _wpa_snprintf_hex(buf, buf_size, data, len, 1);
}
#ifdef CONFIG_ANSI_C_EXTRA
#ifdef _WIN32_WCE
void perror(const char *s)
{
wpa_printf(MSG_ERROR, "%s: GetLastError: %d",
s, (int) GetLastError());
}
#endif /* _WIN32_WCE */
int optind = 1;
int optopt;
char *optarg;
int getopt(int argc, char *const argv[], const char *optstring)
{
static int optchr = 1;
char *cp;
if (optchr == 1) {
if (optind >= argc) {
/* all arguments processed */
return EOF;
}
if (argv[optind][0] != '-' || argv[optind][1] == '\0') {
/* no option characters */
return EOF;
}
}
if (os_strcmp(argv[optind], "--") == 0) {
/* no more options */
optind++;
return EOF;
}
optopt = argv[optind][optchr];
cp = os_strchr(optstring, optopt);
if (cp == NULL || optopt == ':') {
if (argv[optind][++optchr] == '\0') {
optchr = 1;
optind++;
}
return '?';
}
if (cp[1] == ':') {
/* Argument required */
optchr = 1;
if (argv[optind][optchr + 1]) {
/* No space between option and argument */
optarg = &argv[optind++][optchr + 1];
} else if (++optind >= argc) {
/* option requires an argument */
return '?';
} else {
/* Argument in the next argv */
optarg = argv[optind++];
}
} else {
/* No argument */
if (argv[optind][++optchr] == '\0') {
optchr = 1;
optind++;
}
optarg = NULL;
}
return *cp;
}
#endif /* CONFIG_ANSI_C_EXTRA */
#ifdef CONFIG_NATIVE_WINDOWS
/**
* wpa_unicode2ascii_inplace - Convert unicode string into ASCII
* @str: Pointer to string to convert
*
* This function converts a unicode string to ASCII using the same
* buffer for output. If UNICODE is not set, the buffer is not
* modified.
*/
void wpa_unicode2ascii_inplace(TCHAR *str)
{
#ifdef UNICODE
char *dst = (char *) str;
while (*str)
*dst++ = (char) *str++;
*dst = '\0';
#endif /* UNICODE */
}
TCHAR * wpa_strdup_tchar(const char *str)
{
#ifdef UNICODE
TCHAR *buf;
buf = os_malloc((strlen(str) + 1) * sizeof(TCHAR));
if (buf == NULL)
return NULL;
wsprintf(buf, L"%S", str);
return buf;
#else /* UNICODE */
return os_strdup(str);
#endif /* UNICODE */
}
#endif /* CONFIG_NATIVE_WINDOWS */
void printf_encode(char *txt, size_t maxlen, const u8 *data, size_t len)
{
char *end = txt + maxlen;
size_t i;
for (i = 0; i < len; i++) {
if (txt + 4 > end)
break;
switch (data[i]) {
case '\"':
*txt++ = '\\';
*txt++ = '\"';
break;
case '\\':
*txt++ = '\\';
*txt++ = '\\';
break;
case '\e':
*txt++ = '\\';
*txt++ = 'e';
break;
case '\n':
*txt++ = '\\';
*txt++ = 'n';
break;
case '\r':
*txt++ = '\\';
*txt++ = 'r';
break;
case '\t':
*txt++ = '\\';
*txt++ = 't';
break;
default:
if (data[i] >= 32 && data[i] <= 127) {
*txt++ = data[i];
} else {
txt += os_snprintf(txt, end - txt, "\\x%02x",
data[i]);
}
break;
}
}
*txt = '\0';
}
size_t printf_decode(u8 *buf, size_t maxlen, const char *str)
{
const char *pos = str;
size_t len = 0;
int val;
while (*pos) {
if (len == maxlen)
break;
switch (*pos) {
case '\\':
pos++;
switch (*pos) {
case '\\':
buf[len++] = '\\';
pos++;
break;
case '"':
buf[len++] = '"';
pos++;
break;
case 'n':
buf[len++] = '\n';
pos++;
break;
case 'r':
buf[len++] = '\r';
pos++;
break;
case 't':
buf[len++] = '\t';
pos++;
break;
case 'e':
buf[len++] = '\e';
pos++;
break;
case 'x':
pos++;
val = hex2byte(pos);
if (val < 0) {
val = hex2num(*pos);
if (val < 0)
break;
buf[len++] = val;
pos++;
} else {
buf[len++] = val;
pos += 2;
}
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
val = *pos++ - '0';
if (*pos >= '0' && *pos <= '7')
val = val * 8 + (*pos++ - '0');
if (*pos >= '0' && *pos <= '7')
val = val * 8 + (*pos++ - '0');
buf[len++] = val;
break;
default:
break;
}
break;
default:
buf[len++] = *pos++;
break;
}
}
return len;
}
/**
* wpa_ssid_txt - Convert SSID to a printable string
* @ssid: SSID (32-octet string)
* @ssid_len: Length of ssid in octets
* Returns: Pointer to a printable string
*
* This function can be used to convert SSIDs into printable form. In most
* cases, SSIDs do not use unprintable characters, but IEEE 802.11 standard
* does not limit the used character set, so anything could be used in an SSID.
*
* This function uses a static buffer, so only one call can be used at the
* time, i.e., this is not re-entrant and the returned buffer must be used
* before calling this again.
*/
const char * wpa_ssid_txt(const u8 *ssid, size_t ssid_len)
{
static char ssid_txt[32 * 4 + 1];
if (ssid == NULL) {
ssid_txt[0] = '\0';
return ssid_txt;
}
printf_encode(ssid_txt, sizeof(ssid_txt), ssid, ssid_len);
return ssid_txt;
}
void * __hide_aliasing_typecast(void *foo)
{
return foo;
}
char * wpa_config_parse_string(const char *value, size_t *len)
{
if (*value == '"') {
const char *pos;
char *str;
value++;
pos = os_strrchr(value, '"');
if (pos == NULL || pos[1] != '\0')
return NULL;
*len = pos - value;
str = os_malloc(*len + 1);
if (str == NULL)
return NULL;
os_memcpy(str, value, *len);
str[*len] = '\0';
return str;
} else if (*value == 'P' && value[1] == '"') {
const char *pos;
char *tstr, *str;
size_t tlen;
value += 2;
pos = os_strrchr(value, '"');
if (pos == NULL || pos[1] != '\0')
return NULL;
tlen = pos - value;
tstr = os_malloc(tlen + 1);
if (tstr == NULL)
return NULL;
os_memcpy(tstr, value, tlen);
tstr[tlen] = '\0';
str = os_malloc(tlen + 1);
if (str == NULL) {
os_free(tstr);
return NULL;
}
*len = printf_decode((u8 *) str, tlen + 1, tstr);
os_free(tstr);
return str;
} else {
u8 *str;
size_t tlen, hlen = os_strlen(value);
if (hlen & 1)
return NULL;
tlen = hlen / 2;
str = os_malloc(tlen + 1);
if (str == NULL)
return NULL;
if (hexstr2bin(value, str, tlen)) {
os_free(str);
return NULL;
}
str[tlen] = '\0';
*len = tlen;
return (char *) str;
}
}
int is_hex(const u8 *data, size_t len)
{
size_t i;
for (i = 0; i < len; i++) {
if (data[i] < 32 || data[i] >= 127)
return 1;
}
return 0;
}
size_t merge_byte_arrays(u8 *res, size_t res_len,
const u8 *src1, size_t src1_len,
const u8 *src2, size_t src2_len)
{
size_t len = 0;
os_memset(res, 0, res_len);
if (src1) {
if (src1_len >= res_len) {
os_memcpy(res, src1, res_len);
return res_len;
}
os_memcpy(res, src1, src1_len);
len += src1_len;
}
if (src2) {
if (len + src2_len >= res_len) {
os_memcpy(res + len, src2, res_len - len);
return res_len;
}
os_memcpy(res + len, src2, src2_len);
len += src2_len;
}
return len;
}