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libtins/src/radiotap.cpp
Matias Fontanini 69c018ce68 Fixed some endianess bugs in RadioTap.
2011-09-06 11:44:45 -03:00

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/*
* libtins is a net packet wrapper library for crafting and
* interpreting sniffed packets.
*
* Copyright (C) 2011 Nasel
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <cstring>
#include <cassert>
#ifndef WIN32
#include <net/ethernet.h>
#include <netpacket/packet.h>
#endif
#include "radiotap.h"
#include "dot11.h"
#include "utils.h"
Tins::RadioTap::RadioTap(const std::string &iface, PDU *child) throw (std::runtime_error) : PDU(0xff, child), _options_size(0) {
if(!Utils::interface_id(iface, _iface_index))
throw std::runtime_error("Invalid interface name!");
std::memset(&_radio, 0, sizeof(_radio));
init();
}
Tins::RadioTap::RadioTap(uint32_t iface_index, PDU *child) : PDU(0xff, child), _iface_index(iface_index) {
std::memset(&_radio, 0, sizeof(_radio));
init();
}
Tins::RadioTap::RadioTap(const uint8_t *buffer, uint32_t total_sz) : PDU(0xff) {
static const std::string msg("Not enough size for an RadioTap header in the buffer.");
if(total_sz < sizeof(_radio))
throw std::runtime_error(msg);
const uint8_t *buffer_start = buffer;
std::memcpy(&_radio, buffer, sizeof(_radio));
buffer += sizeof(_radio);
total_sz -= sizeof(_radio);
if(_radio.tsft) {
if(total_sz < sizeof(_tsft))
throw std::runtime_error(msg);
memcpy(&_tsft, buffer, sizeof(_tsft));
buffer += sizeof(_tsft);
total_sz -= sizeof(_tsft);
}
if(_radio.flags) {
if(total_sz < sizeof(_flags))
throw std::runtime_error(msg);
memcpy(&_flags, buffer, sizeof(_flags));
buffer += sizeof(_flags);
total_sz -= sizeof(_flags);
}
if(_radio.rate) {
if(total_sz < sizeof(_rate))
throw std::runtime_error(msg);
memcpy(&_rate, buffer, sizeof(_rate));
buffer += sizeof(_rate);
total_sz -= sizeof(_rate);
}
if(_radio.channel) {
if(((buffer_start - buffer) & 1) == 1) {
buffer++;
total_sz--;
}
if(total_sz < sizeof(uint32_t))
throw std::runtime_error(msg);
memcpy(&_channel_freq, buffer, sizeof(_channel_freq));
buffer += sizeof(_channel_freq);
memcpy(&_channel_type, buffer, sizeof(_channel_type));
buffer += sizeof(_channel_type);
total_sz -= sizeof(uint32_t);
}
if(_radio.dbm_signal) {
if(total_sz < sizeof(_dbm_signal))
throw std::runtime_error(msg);
memcpy(&_dbm_signal, buffer, sizeof(_dbm_signal));
buffer += sizeof(_dbm_signal);
total_sz -= sizeof(_dbm_signal);
}
if(_radio.antenna) {
if(total_sz < sizeof(_antenna))
throw std::runtime_error(msg);
memcpy(&_antenna, buffer, sizeof(_antenna));
buffer += sizeof(_antenna);
total_sz -= sizeof(_antenna);
}
if(_radio.rx_flags) {
if(((buffer_start - buffer) & 1) == 1) {
buffer++;
total_sz--;
}
if(total_sz < sizeof(_rx_flags))
throw std::runtime_error(msg);
memcpy(&_rx_flags, buffer, sizeof(_rx_flags));
buffer += sizeof(_rx_flags);
total_sz -= sizeof(_rx_flags);
}
if(total_sz)
inner_pdu(Dot11::from_bytes(buffer, total_sz));
}
void Tins::RadioTap::init() {
channel(Utils::channel_to_mhz(1), 0xa0);
flags(FCS);
tsft(0);
dbm_signal(0xce);
rx_flag(0);
antenna(0);
}
void Tins::RadioTap::version(uint8_t new_version) {
_radio.it_version = new_version;
}
void Tins::RadioTap::padding(uint8_t new_padding) {
_radio.it_pad = new_padding;
}
void Tins::RadioTap::length(uint8_t new_length) {
_radio.it_len = new_length;
}
void Tins::RadioTap::tsft(uint64_t new_tsft) {
_tsft = new_tsft;
if(!_radio.tsft)
_options_size += sizeof(_tsft);
_radio.tsft = 1;
}
void Tins::RadioTap::flags(FrameFlags new_flags) {
_flags = (uint8_t)new_flags;
if(!_radio.flags)
_options_size += sizeof(_flags);
_radio.flags = 1;
}
void Tins::RadioTap::rate(uint8_t new_rate) {
_rate = new_rate;
if(!_radio.rate)
_options_size += sizeof(uint8_t);
_radio.rate = 1;
}
void Tins::RadioTap::channel(uint16_t new_freq, uint16_t new_type) {
_channel_freq = new_freq;
_channel_type = new_type;
if(!_radio.channel)
_options_size += sizeof(_channel_freq) + sizeof(_channel_type);
_radio.channel = 1;
}
void Tins::RadioTap::dbm_signal(uint8_t new_dbm_signal) {
_dbm_signal = new_dbm_signal;
if(!_radio.dbm_signal)
_options_size += sizeof(_dbm_signal);
_radio.dbm_signal = 1;
}
void Tins::RadioTap::antenna(uint8_t new_antenna) {
_antenna = new_antenna;
if(!_radio.antenna)
_options_size += sizeof(_antenna);
_radio.antenna = 1;
}
void Tins::RadioTap::rx_flag(uint16_t new_rx_flag) {
_rx_flags = new_rx_flag;
if(!_radio.rx_flags)
_options_size += sizeof(_rx_flags);
_radio.rx_flags = 1;
}
uint32_t Tins::RadioTap::header_size() const {
uint8_t padding = 0;
if((_radio.flags ^ _radio.rate) == 1)
padding++;
if((_radio.dbm_signal ^ _radio.antenna) == 1)
padding++;
return sizeof(_radio) + _options_size + padding;
}
uint32_t Tins::RadioTap::trailer_size() const {
// will be sizeof(uint32_t) if the FCS-at-the-end bit is on.
return ((_flags & 0x10) != 0) ? sizeof(uint32_t) : 0;
}
bool Tins::RadioTap::send(PacketSender* sender) {
struct sockaddr_ll addr;
memset(&addr, 0, sizeof(struct sockaddr_ll));
addr.sll_family = Utils::net_to_host_s(PF_PACKET);
addr.sll_protocol = Utils::net_to_host_s(ETH_P_ALL);
addr.sll_halen = 6;
addr.sll_ifindex = _iface_index;
Tins::Dot11 *wlan = dynamic_cast<Tins::Dot11*>(inner_pdu());
if(wlan)
memcpy(&(addr.sll_addr), wlan->addr1(), 6);
return sender->send_l2(this, (struct sockaddr*)&addr, (uint32_t)sizeof(addr));
}
void Tins::RadioTap::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent) {
uint32_t sz = header_size();
uint8_t *buffer_start = buffer;
assert(total_sz >= sz);
if(!_radio.it_len)
_radio.it_len = sz;
memcpy(buffer, &_radio, sizeof(_radio));
buffer += sizeof(_radio);
if(_radio.tsft) {
memcpy(buffer, &_tsft, sizeof(_tsft));
buffer += sizeof(_tsft);
}
if(_radio.flags) {
memcpy(buffer, &_flags, sizeof(_flags));
buffer += sizeof(_flags);
}
if(_radio.rate) {
memcpy(buffer, &_rate, sizeof(_rate));
buffer += sizeof(_rate);
}
if(_radio.channel) {
if(((buffer_start - buffer) & 1) == 1)
*(buffer++) = 0;
memcpy(buffer, &_channel_freq, sizeof(_channel_freq));
buffer += sizeof(_channel_freq);
memcpy(buffer, &_channel_type, sizeof(_channel_type));
buffer += sizeof(_channel_type);
}
if(_radio.dbm_signal) {
memcpy(buffer, &_dbm_signal, sizeof(_dbm_signal));
buffer += sizeof(_dbm_signal);
}
if(_radio.antenna) {
memcpy(buffer, &_antenna, sizeof(_antenna));
buffer += sizeof(_antenna);
}
if(_radio.rx_flags) {
if(((buffer_start - buffer) & 1) == 1)
*(buffer++) = 0;
memcpy(buffer, &_rx_flags, sizeof(_rx_flags));
buffer += sizeof(_rx_flags);
}
if((_flags & 0x10) != 0 && inner_pdu())
*(uint32_t*)(buffer + inner_pdu()->size()) = Utils::crc32(buffer, inner_pdu()->size());
}
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