mirror of
https://github.com/vanhoefm/fragattacks.git
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0f3d578efc
Remove the GPL notification text from the files that were initially contributed by myself. Signed-hostap: Jouni Malinen <j@w1.fi>
382 lines
8.0 KiB
C
382 lines
8.0 KiB
C
/*
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* wpa_supplicant/hostapd / common helper functions, etc.
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* Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "includes.h"
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#include "common.h"
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static int hex2num(char c)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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if (c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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if (c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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return -1;
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}
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int hex2byte(const char *hex)
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{
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int a, b;
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a = hex2num(*hex++);
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if (a < 0)
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return -1;
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b = hex2num(*hex++);
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if (b < 0)
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return -1;
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return (a << 4) | b;
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}
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/**
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* hwaddr_aton - Convert ASCII string to MAC address (colon-delimited format)
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* @txt: MAC address as a string (e.g., "00:11:22:33:44:55")
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* @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes)
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* Returns: 0 on success, -1 on failure (e.g., string not a MAC address)
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*/
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int hwaddr_aton(const char *txt, u8 *addr)
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{
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int i;
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for (i = 0; i < 6; i++) {
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int a, b;
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a = hex2num(*txt++);
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if (a < 0)
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return -1;
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b = hex2num(*txt++);
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if (b < 0)
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return -1;
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*addr++ = (a << 4) | b;
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if (i < 5 && *txt++ != ':')
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return -1;
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}
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return 0;
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}
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/**
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* hwaddr_compact_aton - Convert ASCII string to MAC address (no colon delimitors format)
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* @txt: MAC address as a string (e.g., "001122334455")
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* @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes)
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* Returns: 0 on success, -1 on failure (e.g., string not a MAC address)
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*/
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int hwaddr_compact_aton(const char *txt, u8 *addr)
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{
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int i;
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for (i = 0; i < 6; i++) {
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int a, b;
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a = hex2num(*txt++);
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if (a < 0)
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return -1;
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b = hex2num(*txt++);
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if (b < 0)
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return -1;
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*addr++ = (a << 4) | b;
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}
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return 0;
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}
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/**
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* hwaddr_aton2 - Convert ASCII string to MAC address (in any known format)
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* @txt: MAC address as a string (e.g., 00:11:22:33:44:55 or 0011.2233.4455)
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* @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes)
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* Returns: Characters used (> 0) on success, -1 on failure
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*/
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int hwaddr_aton2(const char *txt, u8 *addr)
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{
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int i;
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const char *pos = txt;
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for (i = 0; i < 6; i++) {
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int a, b;
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while (*pos == ':' || *pos == '.' || *pos == '-')
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pos++;
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a = hex2num(*pos++);
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if (a < 0)
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return -1;
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b = hex2num(*pos++);
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if (b < 0)
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return -1;
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*addr++ = (a << 4) | b;
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}
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return pos - txt;
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}
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/**
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* hexstr2bin - Convert ASCII hex string into binary data
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* @hex: ASCII hex string (e.g., "01ab")
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* @buf: Buffer for the binary data
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* @len: Length of the text to convert in bytes (of buf); hex will be double
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* this size
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* Returns: 0 on success, -1 on failure (invalid hex string)
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*/
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int hexstr2bin(const char *hex, u8 *buf, size_t len)
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{
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size_t i;
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int a;
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const char *ipos = hex;
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u8 *opos = buf;
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for (i = 0; i < len; i++) {
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a = hex2byte(ipos);
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if (a < 0)
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return -1;
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*opos++ = a;
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ipos += 2;
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}
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return 0;
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}
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/**
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* inc_byte_array - Increment arbitrary length byte array by one
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* @counter: Pointer to byte array
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* @len: Length of the counter in bytes
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*
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* This function increments the last byte of the counter by one and continues
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* rolling over to more significant bytes if the byte was incremented from
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* 0xff to 0x00.
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*/
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void inc_byte_array(u8 *counter, size_t len)
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{
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int pos = len - 1;
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while (pos >= 0) {
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counter[pos]++;
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if (counter[pos] != 0)
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break;
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pos--;
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}
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}
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void wpa_get_ntp_timestamp(u8 *buf)
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{
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struct os_time now;
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u32 sec, usec;
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be32 tmp;
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/* 64-bit NTP timestamp (time from 1900-01-01 00:00:00) */
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os_get_time(&now);
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sec = now.sec + 2208988800U; /* Epoch to 1900 */
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/* Estimate 2^32/10^6 = 4295 - 1/32 - 1/512 */
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usec = now.usec;
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usec = 4295 * usec - (usec >> 5) - (usec >> 9);
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tmp = host_to_be32(sec);
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os_memcpy(buf, (u8 *) &tmp, 4);
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tmp = host_to_be32(usec);
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os_memcpy(buf + 4, (u8 *) &tmp, 4);
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}
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static inline int _wpa_snprintf_hex(char *buf, size_t buf_size, const u8 *data,
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size_t len, int uppercase)
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{
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size_t i;
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char *pos = buf, *end = buf + buf_size;
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int ret;
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if (buf_size == 0)
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return 0;
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for (i = 0; i < len; i++) {
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ret = os_snprintf(pos, end - pos, uppercase ? "%02X" : "%02x",
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data[i]);
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if (ret < 0 || ret >= end - pos) {
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end[-1] = '\0';
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return pos - buf;
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}
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pos += ret;
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}
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end[-1] = '\0';
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return pos - buf;
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}
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/**
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* wpa_snprintf_hex - Print data as a hex string into a buffer
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* @buf: Memory area to use as the output buffer
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* @buf_size: Maximum buffer size in bytes (should be at least 2 * len + 1)
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* @data: Data to be printed
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* @len: Length of data in bytes
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* Returns: Number of bytes written
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*/
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int wpa_snprintf_hex(char *buf, size_t buf_size, const u8 *data, size_t len)
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{
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return _wpa_snprintf_hex(buf, buf_size, data, len, 0);
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}
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/**
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* wpa_snprintf_hex_uppercase - Print data as a upper case hex string into buf
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* @buf: Memory area to use as the output buffer
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* @buf_size: Maximum buffer size in bytes (should be at least 2 * len + 1)
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* @data: Data to be printed
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* @len: Length of data in bytes
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* Returns: Number of bytes written
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*/
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int wpa_snprintf_hex_uppercase(char *buf, size_t buf_size, const u8 *data,
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size_t len)
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{
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return _wpa_snprintf_hex(buf, buf_size, data, len, 1);
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}
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#ifdef CONFIG_ANSI_C_EXTRA
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#ifdef _WIN32_WCE
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void perror(const char *s)
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{
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wpa_printf(MSG_ERROR, "%s: GetLastError: %d",
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s, (int) GetLastError());
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}
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#endif /* _WIN32_WCE */
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int optind = 1;
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int optopt;
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char *optarg;
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int getopt(int argc, char *const argv[], const char *optstring)
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{
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static int optchr = 1;
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char *cp;
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if (optchr == 1) {
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if (optind >= argc) {
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/* all arguments processed */
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return EOF;
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}
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if (argv[optind][0] != '-' || argv[optind][1] == '\0') {
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/* no option characters */
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return EOF;
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}
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}
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if (os_strcmp(argv[optind], "--") == 0) {
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/* no more options */
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optind++;
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return EOF;
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}
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optopt = argv[optind][optchr];
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cp = os_strchr(optstring, optopt);
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if (cp == NULL || optopt == ':') {
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if (argv[optind][++optchr] == '\0') {
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optchr = 1;
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optind++;
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}
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return '?';
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}
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if (cp[1] == ':') {
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/* Argument required */
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optchr = 1;
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if (argv[optind][optchr + 1]) {
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/* No space between option and argument */
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optarg = &argv[optind++][optchr + 1];
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} else if (++optind >= argc) {
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/* option requires an argument */
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return '?';
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} else {
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/* Argument in the next argv */
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optarg = argv[optind++];
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}
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} else {
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/* No argument */
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if (argv[optind][++optchr] == '\0') {
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optchr = 1;
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optind++;
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}
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optarg = NULL;
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}
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return *cp;
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}
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#endif /* CONFIG_ANSI_C_EXTRA */
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#ifdef CONFIG_NATIVE_WINDOWS
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/**
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* wpa_unicode2ascii_inplace - Convert unicode string into ASCII
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* @str: Pointer to string to convert
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*
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* This function converts a unicode string to ASCII using the same
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* buffer for output. If UNICODE is not set, the buffer is not
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* modified.
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*/
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void wpa_unicode2ascii_inplace(TCHAR *str)
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{
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#ifdef UNICODE
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char *dst = (char *) str;
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while (*str)
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*dst++ = (char) *str++;
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*dst = '\0';
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#endif /* UNICODE */
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}
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TCHAR * wpa_strdup_tchar(const char *str)
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{
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#ifdef UNICODE
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TCHAR *buf;
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buf = os_malloc((strlen(str) + 1) * sizeof(TCHAR));
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if (buf == NULL)
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return NULL;
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wsprintf(buf, L"%S", str);
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return buf;
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#else /* UNICODE */
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return os_strdup(str);
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#endif /* UNICODE */
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}
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#endif /* CONFIG_NATIVE_WINDOWS */
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/**
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* wpa_ssid_txt - Convert SSID to a printable string
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* @ssid: SSID (32-octet string)
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* @ssid_len: Length of ssid in octets
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* Returns: Pointer to a printable string
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*
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* This function can be used to convert SSIDs into printable form. In most
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* cases, SSIDs do not use unprintable characters, but IEEE 802.11 standard
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* does not limit the used character set, so anything could be used in an SSID.
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*
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* This function uses a static buffer, so only one call can be used at the
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* time, i.e., this is not re-entrant and the returned buffer must be used
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* before calling this again.
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*/
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const char * wpa_ssid_txt(const u8 *ssid, size_t ssid_len)
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{
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static char ssid_txt[33];
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char *pos;
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if (ssid_len > 32)
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ssid_len = 32;
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os_memcpy(ssid_txt, ssid, ssid_len);
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ssid_txt[ssid_len] = '\0';
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for (pos = ssid_txt; *pos != '\0'; pos++) {
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if ((u8) *pos < 32 || (u8) *pos >= 127)
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*pos = '_';
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}
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return ssid_txt;
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}
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void * __hide_aliasing_typecast(void *foo)
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{
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return foo;
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}
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