/*
* 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/ieee802_11_defs.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;
}
static const char * hwaddr_parse(const char *txt, u8 *addr)
{
size_t i;
for (i = 0; i < ETH_ALEN; i++) {
int a;
a = hex2byte(txt);
if (a < 0)
return NULL;
txt += 2;
addr[i] = a;
if (i < ETH_ALEN - 1 && *txt++ != ':')
return NULL;
}
return txt;
}
/**
* 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)
{
return hwaddr_parse(txt, addr) ? 0 : -1;
}
/**
* hwaddr_masked_aton - Convert ASCII string with optional mask to MAC address (colon-delimited format)
* @txt: MAC address with optional mask as a string (e.g., "00:11:22:33:44:55/ff:ff:ff:ff:00:00")
* @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes)
* @mask: Buffer for the MAC address mask (ETH_ALEN = 6 bytes)
* @maskable: Flag to indicate whether a mask is allowed
* Returns: 0 on success, -1 on failure (e.g., string not a MAC address)
*/
int hwaddr_masked_aton(const char *txt, u8 *addr, u8 *mask, u8 maskable)
{
const char *r;
/* parse address part */
r = hwaddr_parse(txt, addr);
if (!r)
return -1;
/* check for optional mask */
if (*r == '\0' || isspace((unsigned char) *r)) {
/* no mask specified, assume default */
os_memset(mask, 0xff, ETH_ALEN);
} else if (maskable && *r == '/') {
/* mask specified and allowed */
r = hwaddr_parse(r + 1, mask);
/* parser error? */
if (!r)
return -1;
} else {
/* mask specified but not allowed or trailing garbage */
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;
}
int hwaddr_mask_txt(char *buf, size_t len, const u8 *addr, const u8 *mask)
{
size_t i;
int print_mask = 0;
int res;
for (i = 0; i < ETH_ALEN; i++) {
if (mask[i] != 0xff) {
print_mask = 1;
break;
}
}
if (print_mask)
res = os_snprintf(buf, len, MACSTR "/" MACSTR,
MAC2STR(addr), MAC2STR(mask));
else
res = os_snprintf(buf, len, MACSTR, MAC2STR(addr));
if (os_snprintf_error(len, res))
return -1;
return res;
}
/**
* 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);
}
/**
* wpa_scnprintf - Simpler-to-use snprintf function
* @buf: Output buffer
* @size: Buffer size
* @fmt: format
*
* Simpler snprintf version that doesn't require further error checks - the
* return value only indicates how many bytes were actually written, excluding
* the NULL byte (i.e., 0 on error, size-1 if buffer is not big enough).
*/
int wpa_scnprintf(char *buf, size_t size, const char *fmt, ...)
{
va_list ap;
int ret;
if (!size)
return 0;
va_start(ap, fmt);
ret = vsnprintf(buf, size, fmt, ap);
va_end(ap);
if (ret < 0)
return 0;
if ((size_t) ret >= size)
return size - 1;
return ret;
}
int wpa_snprintf_hex_sep(char *buf, size_t buf_size, const u8 *data, size_t len,
char sep)
{
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, "%02x%c",
data[i], sep);
if (os_snprintf_error(end - pos, ret)) {
end[-1] = '\0';
return pos - buf;
}
pos += ret;
}
pos[-1] = '\0';
return pos - buf;
}
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 (os_snprintf_error(end - pos, ret)) {
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 '\033':
*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] <= 126) {
*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 + 1 >= 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++] = '\033';
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;
}
}
if (maxlen > len)
buf[len] = '\0';
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[SSID_MAX_LEN * 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 = dup_binstr(value, *len);
if (str == NULL)
return NULL;
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 = dup_binstr(value, tlen);
if (tstr == NULL)
return NULL;
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;
}
int has_ctrl_char(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;
}
int has_newline(const char *str)
{
while (*str) {
if (*str == '\n' || *str == '\r')
return 1;
str++;
}
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;
}
char * dup_binstr(const void *src, size_t len)
{
char *res;
if (src == NULL)
return NULL;
res = os_malloc(len + 1);
if (res == NULL)
return NULL;
os_memcpy(res, src, len);
res[len] = '\0';
return res;
}
int freq_range_list_parse(struct wpa_freq_range_list *res, const char *value)
{
struct wpa_freq_range *freq = NULL, *n;
unsigned int count = 0;
const char *pos, *pos2, *pos3;
/*
* Comma separated list of frequency ranges.
* For example: 2412-2432,2462,5000-6000
*/
pos = value;
while (pos && pos[0]) {
n = os_realloc_array(freq, count + 1,
sizeof(struct wpa_freq_range));
if (n == NULL) {
os_free(freq);
return -1;
}
freq = n;
freq[count].min = atoi(pos);
pos2 = os_strchr(pos, '-');
pos3 = os_strchr(pos, ',');
if (pos2 && (!pos3 || pos2 < pos3)) {
pos2++;
freq[count].max = atoi(pos2);
} else
freq[count].max = freq[count].min;
pos = pos3;
if (pos)
pos++;
count++;
}
os_free(res->range);
res->range = freq;
res->num = count;
return 0;
}
int freq_range_list_includes(const struct wpa_freq_range_list *list,
unsigned int freq)
{
unsigned int i;
if (list == NULL)
return 0;
for (i = 0; i < list->num; i++) {
if (freq >= list->range[i].min && freq <= list->range[i].max)
return 1;
}
return 0;
}
char * freq_range_list_str(const struct wpa_freq_range_list *list)
{
char *buf, *pos, *end;
size_t maxlen;
unsigned int i;
int res;
if (list->num == 0)
return NULL;
maxlen = list->num * 30;
buf = os_malloc(maxlen);
if (buf == NULL)
return NULL;
pos = buf;
end = buf + maxlen;
for (i = 0; i < list->num; i++) {
struct wpa_freq_range *range = &list->range[i];
if (range->min == range->max)
res = os_snprintf(pos, end - pos, "%s%u",
i == 0 ? "" : ",", range->min);
else
res = os_snprintf(pos, end - pos, "%s%u-%u",
i == 0 ? "" : ",",
range->min, range->max);
if (os_snprintf_error(end - pos, res)) {
os_free(buf);
return NULL;
}
pos += res;
}
return buf;
}
int int_array_len(const int *a)
{
int i;
for (i = 0; a && a[i]; i++)
;
return i;
}
void int_array_concat(int **res, const int *a)
{
int reslen, alen, i;
int *n;
reslen = int_array_len(*res);
alen = int_array_len(a);
n = os_realloc_array(*res, reslen + alen + 1, sizeof(int));
if (n == NULL) {
os_free(*res);
*res = NULL;
return;
}
for (i = 0; i <= alen; i++)
n[reslen + i] = a[i];
*res = n;
}
static int freq_cmp(const void *a, const void *b)
{
int _a = *(int *) a;
int _b = *(int *) b;
if (_a == 0)
return 1;
if (_b == 0)
return -1;
return _a - _b;
}
void int_array_sort_unique(int *a)
{
int alen;
int i, j;
if (a == NULL)
return;
alen = int_array_len(a);
qsort(a, alen, sizeof(int), freq_cmp);
i = 0;
j = 1;
while (a[i] && a[j]) {
if (a[i] == a[j]) {
j++;
continue;
}
a[++i] = a[j++];
}
if (a[i])
i++;
a[i] = 0;
}
void int_array_add_unique(int **res, int a)
{
int reslen;
int *n;
for (reslen = 0; *res && (*res)[reslen]; reslen++) {
if ((*res)[reslen] == a)
return; /* already in the list */
}
n = os_realloc_array(*res, reslen + 2, sizeof(int));
if (n == NULL) {
os_free(*res);
*res = NULL;
return;
}
n[reslen] = a;
n[reslen + 1] = 0;
*res = n;
}
void str_clear_free(char *str)
{
if (str) {
size_t len = os_strlen(str);
os_memset(str, 0, len);
os_free(str);
}
}
void bin_clear_free(void *bin, size_t len)
{
if (bin) {
os_memset(bin, 0, len);
os_free(bin);
}
}
int random_mac_addr(u8 *addr)
{
if (os_get_random(addr, ETH_ALEN) < 0)
return -1;
addr[0] &= 0xfe; /* unicast */
addr[0] |= 0x02; /* locally administered */
return 0;
}
int random_mac_addr_keep_oui(u8 *addr)
{
if (os_get_random(addr + 3, 3) < 0)
return -1;
addr[0] &= 0xfe; /* unicast */
addr[0] |= 0x02; /* locally administered */
return 0;
}
/**
* cstr_token - Get next token from const char string
* @str: a constant string to tokenize
* @delim: a string of delimiters
* @last: a pointer to a character following the returned token
* It has to be set to NULL for the first call and passed for any
* further call.
* Returns: a pointer to token position in str or NULL
*
* This function is similar to str_token, but it can be used with both
* char and const char strings. Differences:
* - The str buffer remains unmodified
* - The returned token is not a NULL terminated string, but a token
* position in str buffer. If a return value is not NULL a size
* of the returned token could be calculated as (last - token).
*/
const char * cstr_token(const char *str, const char *delim, const char **last)
{
const char *end, *token = str;
if (!str || !delim || !last)
return NULL;
if (*last)
token = *last;
while (*token && os_strchr(delim, *token))
token++;
if (!*token)
return NULL;
end = token + 1;
while (*end && !os_strchr(delim, *end))
end++;
*last = end;
return token;
}
/**
* str_token - Get next token from a string
* @buf: String to tokenize. Note that the string might be modified.
* @delim: String of delimiters
* @context: Pointer to save our context. Should be initialized with
* NULL on the first call, and passed for any further call.
* Returns: The next token, NULL if there are no more valid tokens.
*/
char * str_token(char *str, const char *delim, char **context)
{
char *token = (char *) cstr_token(str, delim, (const char **) context);
if (token && **context)
*(*context)++ = '\0';
return token;
}
size_t utf8_unescape(const char *inp, size_t in_size,
char *outp, size_t out_size)
{
size_t res_size = 0;
if (!inp || !outp)
return 0;
if (!in_size)
in_size = os_strlen(inp);
/* Advance past leading single quote */
if (*inp == '\'' && in_size) {
inp++;
in_size--;
}
while (in_size--) {
if (res_size >= out_size)
return 0;
switch (*inp) {
case '\'':
/* Terminate on bare single quote */
*outp = '\0';
return res_size;
case '\\':
if (!in_size--)
return 0;
inp++;
/* fall through */
default:
*outp++ = *inp++;
res_size++;
}
}
/* NUL terminate if space allows */
if (res_size < out_size)
*outp = '\0';
return res_size;
}
size_t utf8_escape(const char *inp, size_t in_size,
char *outp, size_t out_size)
{
size_t res_size = 0;
if (!inp || !outp)
return 0;
/* inp may or may not be NUL terminated, but must be if 0 size
* is specified */
if (!in_size)
in_size = os_strlen(inp);
while (in_size--) {
if (res_size++ >= out_size)
return 0;
switch (*inp) {
case '\\':
case '\'':
if (res_size++ >= out_size)
return 0;
*outp++ = '\\';
/* fall through */
default:
*outp++ = *inp++;
break;
}
}
/* NUL terminate if space allows */
if (res_size < out_size)
*outp = '\0';
return res_size;
}
int is_ctrl_char(char c)
{
return c > 0 && c < 32;
}
/**
* ssid_parse - Parse a string that contains SSID in hex or text format
* @buf: Input NULL terminated string that contains the SSID
* @ssid: Output SSID
* Returns: 0 on success, -1 otherwise
*
* The SSID has to be enclosed in double quotes for the text format or space
* or NULL terminated string of hex digits for the hex format. buf can include
* additional arguments after the SSID.
*/
int ssid_parse(const char *buf, struct wpa_ssid_value *ssid)
{
char *tmp, *res, *end;
size_t len;
ssid->ssid_len = 0;
tmp = os_strdup(buf);
if (!tmp)
return -1;
if (*tmp != '"') {
end = os_strchr(tmp, ' ');
if (end)
*end = '\0';
} else {
end = os_strchr(tmp + 1, '"');
if (!end) {
os_free(tmp);
return -1;
}
end[1] = '\0';
}
res = wpa_config_parse_string(tmp, &len);
if (res && len <= SSID_MAX_LEN) {
ssid->ssid_len = len;
os_memcpy(ssid->ssid, res, len);
}
os_free(tmp);
os_free(res);
return ssid->ssid_len ? 0 : -1;
}
int str_starts(const char *str, const char *start)
{
return os_strncmp(str, start, os_strlen(start)) == 0;
}
/**
* rssi_to_rcpi - Convert RSSI to RCPI
* @rssi: RSSI to convert
* Returns: RCPI corresponding to the given RSSI value, or 255 if not available.
*
* It's possible to estimate RCPI based on RSSI in dBm. This calculation will
* not reflect the correct value for high rates, but it's good enough for Action
* frames which are transmitted with up to 24 Mbps rates.
*/
u8 rssi_to_rcpi(int rssi)
{
if (!rssi)
return 255; /* not available */
if (rssi < -110)
return 0;
if (rssi > 0)
return 220;
return (rssi + 110) * 2;
}