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Add a more flexible version of hwaddr_aton: hwaddr_aton2()

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This version of the MAC address parser allows number of different
string formats for the address (e.g., 00:11:22:33:44:55, 0011.2233.4455,
001122334455, 00-11-22-33-44-55). It returns the number of characters
used from the input string in case of success.
This commit is contained in:
Jouni Malinen 2010-04-06 10:37:13 +03:00
parent 81a658d754
commit 448a0a19d7
2 changed files with 32 additions and 1 deletions
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32
src/utils/common.c
View File

@ -43,7 +43,7 @@ static int hex2byte(const char *hex)
/**
* hwaddr_aton - Convert ASCII string to MAC address
* 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)
@ -70,6 +70,36 @@ int hwaddr_aton(const char *txt, u8 *addr)
}
/**
* 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")

1
src/utils/common.h
View File

@ -436,6 +436,7 @@ typedef u64 __bitwise le64;
#endif /* __must_check */
int hwaddr_aton(const char *txt, u8 *addr);
int hwaddr_aton2(const char *txt, u8 *addr);
int hexstr2bin(const char *hex, u8 *buf, size_t len);
void inc_byte_array(u8 *counter, size_t len);
void wpa_get_ntp_timestamp(u8 *buf);