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/* -*- c++ -*- */
/* @file
* @author (C) 2015 by Piotr Krysik <ptrkrysik@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 "tmsi_dumper_impl.h"
#include "grgsm/gsmtap.h"
#include <iostream>
#include <boost/format.hpp>
namespace gr {
namespace gsm {
void tmsi_dumper_impl::dump_tmsi(pmt::pmt_t msg)
{
time_t t = time(0);
tm *now = localtime(&t);
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 * m = (uint8_t *)(message_plus_header+sizeof(gsmtap_hdr)); //message content
uint8_t msg_len = m[0];
uint8_t direction_and_protocol = m[1];
uint8_t msg_type = m[2];
if( direction_and_protocol == 0x06 && //direction from originating site, transaction id==0, Radio Resouce Management protocol
(msg_type==0x21 || msg_type==0x22 || msg_type==0x24) //types corresponding to paging requests
)
{
//write timestamp
switch(msg_type) {
case 0x21: //Paging Request Type 1
{
uint8_t mobile_identity_type = m[5] & 0x07;
unsigned int next_element_index = 0; //position of the next element
bool found_id_element = false;
if(mobile_identity_type == 0x04) //identity type: TMSI
{
write_tmsi(m+6);
dump_file << "-";
write_timestamp(now);
dump_file << "-0";
dump_file << std::endl;
next_element_index = 10;
found_id_element = true;
} else if(mobile_identity_type == 0x01) //identity type: IMSI
{
dump_file << "0-";
write_timestamp(now);
dump_file << "-";
write_imsi(m+5);
dump_file << std::endl;
next_element_index = 13;
found_id_element = true;
}
if(found_id_element == true)
{
//check if there is additional id element
uint8_t element_id = m[next_element_index];
if((next_element_index < (msg_len+1)) && (element_id == 0x17)) {
//check if there is another element
uint8_t element_len = m[next_element_index+1];
mobile_identity_type = m[next_element_index+2] & 0x07;
if(mobile_identity_type == 0x04) //identity type: TMSI
{
write_tmsi(m+next_element_index+3); //write starting from position of the TMSI in the message
dump_file << "-";
write_timestamp(now);
dump_file << "-0";
dump_file << std::endl;
} else if(mobile_identity_type == 0x01) //identity type: IMSI
{
dump_file << "0-";
write_timestamp(now);
dump_file << "-";
write_imsi(m+next_element_index+2); //write starting from position of the IMSI in the message
dump_file << std::endl;
}
}
int ii;
}
}
break;
case 0x22: //Paging Request Type 2
{
uint8_t mobile_identity_type = m[14] & 0x07;
write_tmsi(m+4);//1st tmsi location
dump_file << "-";
write_timestamp(now);
dump_file << "-0";
dump_file << std::endl;
write_tmsi(m+8);//2nd tmsi location
dump_file << "-";
write_timestamp(now);
dump_file << "-0";
dump_file << std::endl;
if(mobile_identity_type == 0x04) //identity type: TMSI
{
write_tmsi(m+15);
dump_file << "-";
write_timestamp(now);
dump_file << "-0";
dump_file << std::endl;
} else if(mobile_identity_type == 0x01) //identity type: IMSI
{
dump_file << "0-";
write_timestamp(now);
dump_file << "-";
write_imsi(m+14);
dump_file << std::endl;
}
}
break;
case 0x24: //Paging Request Type 3
{
int TMSI_INDEX[4] = {4,8,12,16}; // indexes of the 4 tmsi's
for(int x =0; x < 4; x++)
{
write_tmsi(m+TMSI_INDEX[x]);
dump_file << "-";
write_timestamp(now);
dump_file << "-0";
dump_file << std::endl;
}
}
break;
}
}
}
inline void tmsi_dumper_impl::write_timestamp(tm * now)
{
dump_file << boost::format("%d%02d%02d%02d%02d%02d")
% (now->tm_year + 1900-2000) //year -2000 here after the 1900 leaves you with 15 instead of 2015 (delivery reports format is 150112223501)
% (now->tm_mon + 1) //month
% now->tm_mday //day
% now->tm_hour % now->tm_min % now->tm_sec; //time of day
return;
}
inline int swap(uint8_t c)
{
uint8_t temp1, temp2;
temp1 = c & 0x0F;
temp2 = c & 0xF0;
temp1=temp1 << 4;
temp2=temp2 >> 4;
return(temp2|temp1);
}
void tmsi_dumper_impl::write_imsi(uint8_t * imsi)
{
dump_file << boost::format("%1x%02x%02x%02x%02x%02x%02x%02x")
% (swap(imsi[0]) & 0x0f)
% swap(imsi[1]) % swap(imsi[2]) % swap(imsi[3]) % swap(imsi[4]) % swap(imsi[5]) % swap(imsi[6]) % swap(imsi[7]);
return;
}
void tmsi_dumper_impl::write_tmsi(uint8_t * tmsi)
{
dump_file << boost::format("%02x%02x%02x%02x")
% (int)tmsi[0] % (int)tmsi[1] % (int)tmsi[2] % (int)tmsi[3];
return;
}
tmsi_dumper::sptr
tmsi_dumper::make()
{
return gnuradio::get_initial_sptr
(new tmsi_dumper_impl());
}
/*
* The private constructor
*/
tmsi_dumper_impl::tmsi_dumper_impl()
: gr::block("tmsi_dumper",
gr::io_signature::make(0, 0, 0),
gr::io_signature::make(0, 0, 0))
{
dump_file.open("tmsicount.txt", std::ios_base::app);
message_port_register_in(pmt::mp("msgs"));
set_msg_handler(pmt::mp("msgs"), boost::bind(&tmsi_dumper_impl::dump_tmsi, this, _1));
}
/*
* Our virtual destructor.
*/
tmsi_dumper_impl::~tmsi_dumper_impl()
{
dump_file.close();
}
} /* namespace gsm */
} /* namespace gr */
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