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Code Issues Releases Wiki Activity

fix radiotap header parsing

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Signed-off-by: Matias Fontanini <matias.fontanini@gmail.com>
This commit is contained in:
Piotr Haber
2013-04-16 17:03:52 +02:00
committed by Matias Fontanini
parent 58c8eccc46
commit 9bcfd07896
1 changed files with 26 additions and 19 deletions
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45
src/radiotap.cpp
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@@ -71,60 +71,67 @@ 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 = Endian::le_to_host(_radio.it_len);
check_size(total_sz, radiotap_hdr_size);
buffer += sizeof(_radio);
total_sz -= sizeof(_radio);
radiotap_hdr_size -= sizeof(_radio);
if(_radio.tsft)
read_field(buffer, total_sz, _tsft);
read_field(buffer, radiotap_hdr_size, _tsft);
if(_radio.flags)
read_field(buffer, total_sz, _flags);
read_field(buffer, radiotap_hdr_size, _flags);
if(_radio.rate)
read_field(buffer, total_sz, _rate);
read_field(buffer, radiotap_hdr_size, _rate);
if(_radio.channel) {
if(((buffer - buffer_start) & 1) == 1) {
buffer++;
total_sz--;
radiotap_hdr_size--;
}
read_field(buffer, total_sz, _channel_freq);
read_field(buffer, radiotap_hdr_size, _channel_freq);
uint16_t dummy;
read_field(buffer, total_sz, dummy);
read_field(buffer, radiotap_hdr_size, dummy);
_channel_type = dummy;
}
if(_radio.dbm_signal)
read_field(buffer, total_sz, _dbm_signal);
read_field(buffer, radiotap_hdr_size, _dbm_signal);
if(_radio.dbm_noise)
read_field(buffer, total_sz, _dbm_noise);
read_field(buffer, radiotap_hdr_size, _dbm_noise);
if(_radio.antenna)
read_field(buffer, total_sz, _antenna);
read_field(buffer, radiotap_hdr_size, _antenna);
if(_radio.rx_flags) {
if(((buffer - buffer_start) & 1) == 1) {
buffer++;
total_sz--;
radiotap_hdr_size--;
}
read_field(buffer, total_sz, _rx_flags);
read_field(buffer, radiotap_hdr_size, _rx_flags);
}
if(_radio.channel_plus) {
uint32_t offset = ((buffer - buffer_start) % 4);
if(offset) {
offset = 4 - offset;
buffer += offset;
total_sz -= offset;
radiotap_hdr_size -= offset;
}
read_field(buffer, total_sz, _channel_type);
read_field(buffer, total_sz, _channel_freq);
read_field(buffer, total_sz, _channel);
read_field(buffer, total_sz, _max_power);
read_field(buffer, radiotap_hdr_size, _channel_type);
read_field(buffer, radiotap_hdr_size, _channel_freq);
read_field(buffer, radiotap_hdr_size, _channel);
read_field(buffer, radiotap_hdr_size, _max_power);
}
if((flags() & FCS) != 0) {
check_size(total_sz, sizeof(uint32_t));
total_sz -= sizeof(uint32_t);
check_size(radiotap_hdr_size, sizeof(uint32_t));
radiotap_hdr_size -= sizeof(uint32_t);
}
total_sz -= _radio.it_len;
buffer += radiotap_hdr_size;
if(total_sz)
inner_pdu(Dot11::from_bytes(buffer, total_sz));
}