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481c51b4c7541c6bcfaa8be34d7b93a59fa81010
libtins/src/radiotap.cpp
Matias Fontanini 38239be472 Remove unused cassert header inclusions
2015-12-27 04:38:31 -08:00

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/*
* Copyright (c) 2014, Matias Fontanini
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "radiotap.h"
#ifdef HAVE_DOT11
#include <cstring>
#include <stdexcept>
#include "macros.h"
#ifndef _WIN32
#if defined(BSD) || defined(__FreeBSD_kernel__)
#include <net/if_dl.h>
#else
#include <netpacket/packet.h>
#include <sys/socket.h>
#endif
#include <net/ethernet.h>
#endif
#include "dot11/dot11_base.h"
#include "utils.h"
#include "packet_sender.h"
#include "exceptions.h"
#include "memory_helpers.h"
using Tins::Memory::OutputMemoryStream;
namespace Tins {
void check_size(uint32_t total_sz, size_t field_size) {
if(total_sz < field_size)
throw malformed_packet();
}
template<typename T>
void read_field(const uint8_t* &buffer, uint32_t &total_sz, T& field) {
check_size(total_sz, sizeof(field));
memcpy(&field, buffer, sizeof(field));
buffer += sizeof(field);
total_sz -= sizeof(field);
}
RadioTap::RadioTap() : _radio()
{
init();
}
RadioTap::RadioTap(const uint8_t *buffer, uint32_t total_sz)
{
check_size(total_sz, sizeof(_radio));
const uint8_t *buffer_start = buffer;
std::memcpy(&_radio, buffer, sizeof(_radio));
uint32_t radiotap_hdr_size = length();
check_size(total_sz, radiotap_hdr_size);
// We start on the first flags field, skipping version, pad and length.
const flags_type* current_flags = (const flags_type*)(buffer + sizeof(uint32_t));
const uint32_t extra_flags_size = find_extra_flag_fields_size(
buffer + sizeof(uint32_t), total_sz);
// Find and skip the extra flag fields.
buffer += extra_flags_size;
radiotap_hdr_size -= extra_flags_size;
// Also skip the header
buffer += sizeof(_radio);
radiotap_hdr_size -= sizeof(_radio);
while(true) {
_radio.flags_32 |= *(const uint32_t*)current_flags;
if(current_flags->tsft) {
align_buffer<8>(buffer_start, buffer, radiotap_hdr_size);
read_field(buffer, radiotap_hdr_size, _tsft);
}
if(current_flags->flags)
read_field(buffer, radiotap_hdr_size, _flags);
if(current_flags->rate)
read_field(buffer, radiotap_hdr_size, _rate);
if(current_flags->channel) {
align_buffer<2>(buffer_start, buffer, radiotap_hdr_size);
read_field(buffer, radiotap_hdr_size, _channel_freq);
read_field(buffer, radiotap_hdr_size, _channel_type);
}
if(current_flags->dbm_signal)
read_field(buffer, radiotap_hdr_size, _dbm_signal);
if(current_flags->dbm_noise)
read_field(buffer, radiotap_hdr_size, _dbm_noise);
if(current_flags->lock_quality)
read_field(buffer, radiotap_hdr_size, _signal_quality);
if(current_flags->antenna)
read_field(buffer, radiotap_hdr_size, _antenna);
if(current_flags->db_signal)
read_field(buffer, radiotap_hdr_size, _db_signal);
if(current_flags->rx_flags) {
align_buffer<2>(buffer_start, buffer, radiotap_hdr_size);
read_field(buffer, radiotap_hdr_size, _rx_flags);
}
if(current_flags->tx_flags) {
align_buffer<2>(buffer_start, buffer, radiotap_hdr_size);
read_field(buffer, radiotap_hdr_size, _tx_flags);
}
if(current_flags->data_retries) {
read_field(buffer, radiotap_hdr_size, _data_retries);
}
if(current_flags->channel_plus) {
align_buffer<4>(buffer_start, buffer, radiotap_hdr_size);
uint32_t dummy;
read_field(buffer, radiotap_hdr_size, dummy);
// nasty Big Endian fix
_channel_type = Endian::le_to_host<uint16_t>(Endian::host_to_le<uint32_t>(dummy));
read_field(buffer, radiotap_hdr_size, _channel_freq);
read_field(buffer, radiotap_hdr_size, _channel);
read_field(buffer, radiotap_hdr_size, _max_power);
}
if(current_flags->mcs) {
read_field(buffer, radiotap_hdr_size, _mcs.known);
read_field(buffer, radiotap_hdr_size, _mcs.flags);
read_field(buffer, radiotap_hdr_size, _mcs.mcs);
}
// We can do this safely because we checked the size on find_extra_flags...
if(current_flags->ext == 1) {
current_flags++;
}
else {
break;
}
}
total_sz -= length();
buffer += radiotap_hdr_size;
if(_radio.flags.flags && (flags() & FCS) != 0) {
check_size(total_sz, sizeof(uint32_t));
total_sz -= sizeof(uint32_t);
if((flags() & FAILED_FCS) !=0)
throw malformed_packet();
}
if(total_sz)
inner_pdu(Dot11::from_bytes(buffer, total_sz));
}
void RadioTap::init() {
channel(Utils::channel_to_mhz(1), 0xa0);
flags(FCS);
tsft(0);
dbm_signal(-50);
rx_flags(0);
antenna(0);
}
// This method finds the extra flags field size, taking into account other
// set of flags that may appear if the "ext" bit is on/.
uint32_t RadioTap::find_extra_flag_fields_size(const uint8_t* buffer, uint32_t total_sz) {
const flags_type* ptr = (const flags_type*)buffer;
while (ptr->ext == 1) {
if (total_sz < sizeof(flags_type)) {
throw malformed_packet();
}
++ptr;
}
return static_cast<uint32_t>((const uint8_t*)ptr - buffer);
}
// Setter for RadioTap fields
void RadioTap::version(uint8_t new_version) {
_radio.it_version = new_version;
}
void RadioTap::padding(uint8_t new_padding) {
_radio.it_pad = new_padding;
}
void RadioTap::length(uint16_t new_length) {
_radio.it_len = Endian::host_to_le(new_length);
}
void RadioTap::tsft(uint64_t new_tsft) {
_tsft = Endian::host_to_le(new_tsft);
_radio.flags.tsft = 1;
}
void RadioTap::flags(FrameFlags new_flags) {
_flags = (uint8_t)new_flags;
_radio.flags.flags = 1;
}
void RadioTap::rate(uint8_t new_rate) {
_rate = new_rate;
_radio.flags.rate = 1;
}
void RadioTap::channel(uint16_t new_freq, uint16_t new_type) {
_channel_freq = Endian::host_to_le(new_freq);
_channel_type = Endian::host_to_le(new_type);
_radio.flags.channel = 1;
}
void RadioTap::dbm_signal(int8_t new_dbm_signal) {
_dbm_signal = new_dbm_signal;
_radio.flags.dbm_signal = 1;
}
void RadioTap::dbm_noise(int8_t new_dbm_noise) {
_dbm_noise = new_dbm_noise;
_radio.flags.dbm_noise = 1;
}
void RadioTap::signal_quality(uint8_t new_signal_quality) {
_signal_quality = new_signal_quality;
_radio.flags.lock_quality = 1;
}
void RadioTap::data_retries(uint8_t new_data_retries) {
_data_retries = new_data_retries;
_radio.flags.data_retries = 1;
}
void RadioTap::antenna(uint8_t new_antenna) {
_antenna = new_antenna;
_radio.flags.antenna = 1;
}
void RadioTap::db_signal(uint8_t new_db_signal) {
_db_signal = new_db_signal;
_radio.flags.db_signal = 1;
}
void RadioTap::rx_flags(uint16_t new_rx_flag) {
_rx_flags = Endian::host_to_le(new_rx_flag);
_radio.flags.rx_flags = 1;
}
void RadioTap::tx_flags(uint16_t new_tx_flag) {
_tx_flags = Endian::host_to_le(new_tx_flag);
_radio.flags.tx_flags = 1;
}
void RadioTap::mcs(const mcs_type& new_mcs) {
_mcs = new_mcs;
_radio.flags.mcs = 1;
}
uint32_t RadioTap::header_size() const {
uint32_t total_bytes = 0;
if(_radio.flags.tsft)
total_bytes += sizeof(_tsft);
if(_radio.flags.flags)
total_bytes += sizeof(_flags);
if(_radio.flags.rate)
total_bytes += sizeof(_rate);
if(_radio.flags.channel) {
total_bytes += (total_bytes & 1);
total_bytes += sizeof(uint16_t) * 2;
}
if(_radio.flags.dbm_signal)
total_bytes += sizeof(_dbm_signal);
if(_radio.flags.dbm_noise)
total_bytes += sizeof(_dbm_noise);
if(_radio.flags.lock_quality) {
total_bytes += (total_bytes & 1);
total_bytes += sizeof(_signal_quality);
}
if(_radio.flags.antenna)
total_bytes += sizeof(_antenna);
if(_radio.flags.db_signal)
total_bytes += sizeof(_db_signal);
if(_radio.flags.rx_flags) {
total_bytes += (total_bytes & 1);
total_bytes += sizeof(_rx_flags);
}
if(_radio.flags.tx_flags) {
total_bytes += (total_bytes & 1);
total_bytes += sizeof(_tx_flags);
}
if(_radio.flags.data_retries)
total_bytes += sizeof(_data_retries);
if(_radio.flags.channel_plus) {
uint32_t offset = total_bytes % 4;
if(offset)
total_bytes += 4 - offset;
total_bytes += 8;
}
if(_radio.flags.mcs) {
total_bytes += sizeof(_mcs);
}
return sizeof(_radio) + total_bytes;
}
uint32_t 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;
}
// Getter for RadioTap fields
uint8_t RadioTap::version() const {
return _radio.it_version;
}
uint8_t RadioTap::padding() const {
return _radio.it_pad;
}
uint16_t RadioTap::length() const {
return Endian::le_to_host(_radio.it_len);
}
uint64_t RadioTap::tsft() const {
if(!_radio.flags.tsft)
throw field_not_present();
return Endian::le_to_host(_tsft);
}
RadioTap::FrameFlags RadioTap::flags() const {
if(!_radio.flags.flags)
throw field_not_present();
return (FrameFlags)_flags;
}
uint8_t RadioTap::rate() const {
if(!_radio.flags.rate)
throw field_not_present();
return _rate;
}
uint16_t RadioTap::channel_freq() const {
if(!_radio.flags.channel)
throw field_not_present();
return Endian::le_to_host(_channel_freq);
}
uint16_t RadioTap::channel_type() const {
if(!_radio.flags.channel)
throw field_not_present();
return Endian::le_to_host(_channel_type);
}
int8_t RadioTap::dbm_signal() const {
if(!_radio.flags.dbm_signal)
throw field_not_present();
return _dbm_signal;
}
int8_t RadioTap::dbm_noise() const {
if(!_radio.flags.dbm_noise)
throw field_not_present();
return _dbm_noise;
}
uint16_t RadioTap::signal_quality() const {
if(!_radio.flags.lock_quality)
throw field_not_present();
return _signal_quality;
}
uint8_t RadioTap::antenna() const {
if(!_radio.flags.antenna)
throw field_not_present();
return _antenna;
}
RadioTap::mcs_type RadioTap::mcs() const {
if(!_radio.flags.mcs)
throw field_not_present();
return _mcs;
}
uint8_t RadioTap::db_signal() const {
if(!_radio.flags.db_signal)
throw field_not_present();
return _db_signal;
}
uint32_t RadioTap::channel_plus() const {
if(!_radio.flags.channel_plus)
throw field_not_present();
return Endian::le_to_host<uint32_t>(_channel_type);
}
uint16_t RadioTap::rx_flags() const {
if(!_radio.flags.rx_flags)
throw field_not_present();
return Endian::le_to_host(_rx_flags);
}
uint16_t RadioTap::tx_flags() const {
if(!_radio.flags.tx_flags)
throw field_not_present();
return Endian::le_to_host(_tx_flags);
}
uint8_t RadioTap::data_retries() const {
if(!_radio.flags.data_retries)
throw field_not_present();
return _data_retries;
}
#ifndef _WIN32
void RadioTap::send(PacketSender &sender, const NetworkInterface &iface) {
if(!iface)
throw invalid_interface();
#if !defined(BSD) && !defined(__FreeBSD_kernel__)
struct sockaddr_ll addr;
memset(&addr, 0, sizeof(struct sockaddr_ll));
addr.sll_family = Endian::host_to_be<uint16_t>(PF_PACKET);
addr.sll_protocol = Endian::host_to_be<uint16_t>(ETH_P_ALL);
addr.sll_halen = 6;
addr.sll_ifindex = iface.id();
const Tins::Dot11 *wlan = tins_cast<Tins::Dot11*>(inner_pdu());
if(wlan) {
Tins::Dot11::address_type dot11_addr(wlan->addr1());
std::copy(dot11_addr.begin(), dot11_addr.end(), addr.sll_addr);
}
sender.send_l2(*this, (struct sockaddr*)&addr, (uint32_t)sizeof(addr));
#else
sender.send_l2(*this, 0, 0, iface);
#endif
}
#endif
bool RadioTap::matches_response(const uint8_t *ptr, uint32_t total_sz) const {
if(sizeof(_radio) < total_sz)
return false;
const radiotap_hdr *radio_ptr = (const radiotap_hdr*)ptr;
if(radio_ptr->it_len <= total_sz) {
ptr += radio_ptr->it_len;
total_sz -= radio_ptr->it_len;
return inner_pdu() ? inner_pdu()->matches_response(ptr, total_sz) : true;
}
return false;
}
void RadioTap::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent) {
OutputMemoryStream stream(buffer, total_sz);
uint8_t *buffer_start = buffer;
_radio.it_len = Endian::host_to_le<uint16_t>(header_size());
stream.write(_radio);
if(_radio.flags.tsft) {
stream.write(_tsft);
}
if(_radio.flags.flags) {
stream.write(_flags);
}
if(_radio.flags.rate) {
stream.write(_rate);
}
if(_radio.flags.channel) {
if(((buffer - buffer_start) & 1) == 1) {
stream.write<uint8_t>(0);
}
stream.write(_channel_freq);
stream.write(_channel_type);
}
if(_radio.flags.dbm_signal) {
stream.write(_dbm_signal);
}
if(_radio.flags.dbm_noise) {
stream.write(_dbm_noise);
}
if(_radio.flags.lock_quality) {
if(((buffer - buffer_start) & 1) == 1) {
stream.write<uint8_t>(0);
}
stream.write(_signal_quality);
}
if(_radio.flags.antenna) {
stream.write(_antenna);
}
if(_radio.flags.db_signal) {
stream.write(_db_signal);
}
if(_radio.flags.rx_flags) {
if(((buffer - buffer_start) & 1) == 1) {
stream.write<uint8_t>(0);
}
stream.write(_rx_flags);
}
if(_radio.flags.channel_plus) {
const uint32_t padding = ((stream.pointer() - buffer_start) % 4);
if (padding != 0) {
stream.fill(4 - padding, 0);
}
uint32_t dummy = _channel_type;
// nasty Big Endian fix
dummy = Endian::le_to_host<uint32_t>(Endian::host_to_le<uint16_t>(dummy));
stream.write(dummy);
stream.write(_channel_freq);
stream.write(_channel);
stream.write(_max_power);
}
if ((_flags & 0x10) != 0 && inner_pdu()) {
uint32_t crc32 = Endian::host_to_le(
Utils::crc32(stream.pointer(), inner_pdu()->size())
);
stream.skip(inner_pdu()->size());
stream.write(crc32);
}
}
}
#endif // HAVE_DOT11
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