common.c File Reference

wpa_supplicant/hostapd / common helper functions, etc. More...

#include "includes.h"
#include "common.h"

Functions
int	hwaddr_aton (const char *txt, u8 *addr)
	Convert ASCII string to MAC address.
int	hexstr2bin (const char *hex, u8 *buf, size_t len)
	Convert ASCII hex string into binary data.
void	inc_byte_array (u8 *counter, size_t len)
	Increment arbitrary length byte array by one.
void	wpa_get_ntp_timestamp (u8 *buf)
int	wpa_snprintf_hex (char *buf, size_t buf_size, const u8 *data, size_t len)
	Print data as a hex string into a buffer.
int	wpa_snprintf_hex_uppercase (char *buf, size_t buf_size, const u8 *data, size_t len)
	Print data as a upper case hex string into buf.
const char *	wpa_ssid_txt (const u8 *ssid, size_t ssid_len)
	Convert SSID to a printable string.
void *	__hide_aliasing_typecast (void *foo)

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Detailed Description

wpa_supplicant/hostapd / common helper functions, etc.

Copyright

Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi>

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.

Alternatively, this software may be distributed under the terms of BSD license.

See README and COPYING for more details.

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Function Documentation

int hexstr2bin	(	const char *	hex,
		u8 *	buf,
		size_t	len
	)

Convert ASCII hex string into binary data.

Parameters:

	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 hwaddr_aton	(	const char *	txt,
		u8 *	addr
	)

Convert ASCII string to MAC address.

Parameters:

	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)

void inc_byte_array	(	u8 *	counter,
		size_t	len
	)

Increment arbitrary length byte array by one.

Parameters:

	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.

int wpa_snprintf_hex	(	char *	buf,
		size_t	buf_size,
		const u8 *	data,
		size_t	len
	)

Print data as a hex string into a buffer.

Parameters:

	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
	)

Print data as a upper case hex string into buf.

Parameters:

	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

const char* wpa_ssid_txt	(	const u8 *	ssid,
		size_t	ssid_len
	)

Convert SSID to a printable string.

Parameters:

	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.