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/* -*- c++ -*- */
/*
* @file
* @author (C) 2016 by Roman Khassraf <rkhassraf@gmail.com>
* @section LICENSE
*
* Gr-gsm is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* Gr-gsm 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with gr-gsm; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gnuradio/io_signature.h>
#include <grgsm/gsmtap.h>
#include <unistd.h>
#include <grgsm/endian.h>
#include "extract_cmc_impl.h"
namespace gr {
namespace gsm {
void extract_cmc_impl::process_messages(pmt::pmt_t msg)
{
pmt::pmt_t message_plus_header_blob = pmt::cdr(msg);
uint8_t * message_plus_header = (uint8_t *)pmt::blob_data(message_plus_header_blob);
gsmtap_hdr * header = (gsmtap_hdr *)message_plus_header;
uint8_t * msg_elements = (uint8_t *)(message_plus_header+sizeof(gsmtap_hdr));
if((msg_elements[3] & 0xF) == 0x6 && msg_elements[4] == 0x35)
{
int frame_nr = be32toh(header->frame_number);
int a5_version = ((msg_elements[5] & 0xE) >> 1) + 1; //10.5.2.9 Cipher Mode Setting
int start_ciphering = ((msg_elements[5] & 0x1));
d_start_ciphering.push_back(start_ciphering);
d_framenumbers.push_back(frame_nr);
d_a5_versions.push_back(a5_version);
}
}
std::vector<int> extract_cmc_impl::get_framenumbers()
{
return d_framenumbers;
}
std::vector<int> extract_cmc_impl::get_a5_versions()
{
return d_a5_versions;
}
std::vector<int> extract_cmc_impl::get_start_ciphering()
{
return d_start_ciphering;
}
extract_cmc::sptr
extract_cmc::make()
{
return gnuradio::get_initial_sptr
(new extract_cmc_impl());
}
/*
* The private constructor
*/
extract_cmc_impl::extract_cmc_impl()
: gr::block("extract_cmc",
gr::io_signature::make(0, 0, 0),
gr::io_signature::make(0, 0, 0))
{
message_port_register_in(pmt::mp("msgs"));
set_msg_handler(pmt::mp("msgs"), boost::bind(&extract_cmc_impl::process_messages, this, _1));
}
/*
* Our virtual destructor.
*/
extract_cmc_impl::~extract_cmc_impl()
{
}
} /* namespace gsm */
} /* namespace gr */
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