216 lines
4.3 KiB
C
216 lines
4.3 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2014-2019 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <string.h>
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#include <stdio.h>
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#include <sys/uio.h>
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#include <sys/time.h>
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#include <ell/ell.h>
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#include "src/util.h"
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const char *util_ssid_to_utf8(size_t len, const uint8_t *ssid)
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{
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static char buf[3* 32 + 1];
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size_t i = 0, pos = 0;
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const uint8_t *start = ssid, *end;
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memset(buf, 0, sizeof(buf));
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if (len > 32)
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goto no_ssid;
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while (i < len && !ssid[i])
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i++;
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if (i == len)
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goto no_ssid;
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i = len;
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while (i && (!l_utf8_validate((const char *)start, i,
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(const char **)&end))) {
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const char replacement[] = { 0xEF, 0xBF, 0xBD };
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int bytes = end - start;
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memcpy(&buf[pos], start, bytes);
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pos += bytes;
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memcpy(&buf[pos], replacement, sizeof(replacement));
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pos += sizeof(replacement);
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start = end + 1;
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i -= (bytes + 1);
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}
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if (i) {
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memcpy(&buf[pos], start, i);
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pos += i;
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}
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no_ssid:
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buf[pos] = '\0';
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return buf;
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}
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bool util_ssid_is_utf8(size_t len, const uint8_t *ssid)
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{
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if (len > 32)
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return false;
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return l_utf8_validate((const char *)ssid, len, NULL);
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}
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/*
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* Checks whether this is a hidden SSID. Two conditions are checked:
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* 1. If the SSID is length 0
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* 2. If the SSID length > 0 and all bytes are 0
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*
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* The length is not sanitized so the caller must have sanitized the arguments
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* beforehand.
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*/
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bool util_ssid_is_hidden(size_t len, const uint8_t *ssid)
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{
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if (!len)
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return true;
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return util_mem_is_zero(ssid, len);
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}
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const char *util_address_to_string(const uint8_t *addr)
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{
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static char str[18];
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sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
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addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
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return str;
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}
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bool util_string_to_address(const char *str, uint8_t *out_addr)
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{
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unsigned int i;
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uint8_t addr[6];
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if (!str)
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return false;
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if (strlen(str) != 17)
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return false;
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for (i = 0; i < 15; i += 3) {
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if (!l_ascii_isxdigit(str[i]))
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return false;
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if (!l_ascii_isxdigit(str[i + 1]))
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return false;
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if (str[i + 2] != ':')
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return false;
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}
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if (!l_ascii_isxdigit(str[i]))
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return false;
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if (!l_ascii_isxdigit(str[i + 1]))
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return false;
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if (sscanf(str, "%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx",
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&addr[0], &addr[1], &addr[2],
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&addr[3], &addr[4], &addr[5]) != 6)
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return false;
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memcpy(out_addr, addr, sizeof(addr));
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return true;
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}
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bool util_is_group_address(const uint8_t *addr)
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{
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/* 802.11-2016 section 9.2.2 */
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return util_is_bit_set(addr[0], 0);
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}
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bool util_is_broadcast_address(const uint8_t *addr)
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{
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/* 802.11-2016 section 9.2.4.3 */
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static const uint8_t bcast_addr[6] = {
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff
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};
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return !memcmp(addr, bcast_addr, 6);
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}
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/* This function assumes that identity is not bigger than 253 bytes */
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const char *util_get_domain(const char *identity)
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{
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static char domain[256];
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const char *c;
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memset(domain, 0, sizeof(domain));
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for (c = identity; *c; c++) {
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switch (*c) {
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case '\\':
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memcpy(domain, identity, c - identity);
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return domain;
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case '@':
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l_strlcpy(domain, c + 1, sizeof(domain));
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return domain;
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default:
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continue;
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}
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}
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return identity;
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}
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/* This function assumes that identity is not bigger than 253 bytes */
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const char *util_get_username(const char *identity)
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{
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static char username[256];
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const char *c;
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memset(username, 0, sizeof(username));
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for (c = identity; *c; c++) {
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switch (*c) {
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case '\\':
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l_strlcpy(username, c + 1, sizeof(username));
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return username;
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case '@':
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memcpy(username, identity, c - identity);
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return username;
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default:
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continue;
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}
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}
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return identity;
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}
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