233 lines
7.3 KiB
C++
233 lines
7.3 KiB
C++
/* -*- c++ -*- */
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/* @file
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* @author (C) 2015 by Piotr Krysik <ptrkrysik@gmail.com>
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* @section LICENSE
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*
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* Gr-gsm is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* Gr-gsm is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with gr-gsm; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gnuradio/io_signature.h>
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#include "tmsi_dumper_impl.h"
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#include "grgsm/gsmtap.h"
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#include <iostream>
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#include <boost/format.hpp>
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namespace gr {
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namespace gsm {
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void tmsi_dumper_impl::dump_tmsi(pmt::pmt_t msg)
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{
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time_t t = time(0);
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tm *now = localtime(&t);
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pmt::pmt_t message_plus_header_blob = pmt::cdr(msg);
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uint8_t * message_plus_header = (uint8_t *)pmt::blob_data(message_plus_header_blob);
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gsmtap_hdr * header = (gsmtap_hdr *)message_plus_header;
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uint8_t * m = (uint8_t *)(message_plus_header+sizeof(gsmtap_hdr)); //message content
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uint8_t msg_len = m[0];
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uint8_t direction_and_protocol = m[1];
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uint8_t msg_type = m[2];
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if( direction_and_protocol == 0x06 && //direction from originating site, transaction id==0, Radio Resouce Management protocol
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(msg_type==0x21 || msg_type==0x22 || msg_type==0x24) //types corresponding to paging requests
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)
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{
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//write timestamp
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switch(msg_type) {
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case 0x21: //Paging Request Type 1
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{
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uint8_t mobile_identity_type = m[5] & 0x07;
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unsigned int next_element_index = 0; //position of the next element
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bool found_id_element = false;
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if(mobile_identity_type == 0x04) //identity type: TMSI
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{
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write_tmsi(m+6);
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dump_file << "-";
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write_timestamp(now);
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dump_file << "-0";
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dump_file << std::endl;
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next_element_index = 10;
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found_id_element = true;
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} else if(mobile_identity_type == 0x01) //identity type: IMSI
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{
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dump_file << "0-";
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write_timestamp(now);
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dump_file << "-";
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write_imsi(m+5);
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dump_file << std::endl;
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next_element_index = 13;
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found_id_element = true;
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}
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if(found_id_element == true)
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{
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//check if there is additional id element
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uint8_t element_id = m[next_element_index];
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if((next_element_index < (msg_len+1)) && (element_id == 0x17)) {
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//check if there is another element
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uint8_t element_len = m[next_element_index+1];
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mobile_identity_type = m[next_element_index+2] & 0x07;
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if(mobile_identity_type == 0x04) //identity type: TMSI
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{
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write_tmsi(m+next_element_index+3); //write starting from position of the TMSI in the message
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dump_file << "-";
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write_timestamp(now);
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dump_file << "-0";
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dump_file << std::endl;
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} else if(mobile_identity_type == 0x01) //identity type: IMSI
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{
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dump_file << "0-";
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write_timestamp(now);
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dump_file << "-";
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write_imsi(m+next_element_index+2); //write starting from position of the IMSI in the message
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dump_file << std::endl;
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}
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}
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int ii;
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}
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}
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break;
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case 0x22: //Paging Request Type 2
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{
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uint8_t mobile_identity_type = m[14] & 0x07;
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write_tmsi(m+4);//1st tmsi location
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dump_file << "-";
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write_timestamp(now);
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dump_file << "-0";
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dump_file << std::endl;
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write_tmsi(m+8);//2nd tmsi location
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dump_file << "-";
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write_timestamp(now);
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dump_file << "-0";
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dump_file << std::endl;
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if(mobile_identity_type == 0x04) //identity type: TMSI
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{
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write_tmsi(m+15);
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dump_file << "-";
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write_timestamp(now);
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dump_file << "-0";
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dump_file << std::endl;
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} else if(mobile_identity_type == 0x01) //identity type: IMSI
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{
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dump_file << "0-";
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write_timestamp(now);
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dump_file << "-";
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write_imsi(m+14);
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dump_file << std::endl;
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}
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}
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break;
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case 0x24: //Paging Request Type 3
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{
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int TMSI_INDEX[4] = {4,8,12,16}; // indexes of the 4 tmsi's
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for(int x =0; x < 4; x++)
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{
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write_tmsi(m+TMSI_INDEX[x]);
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dump_file << "-";
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write_timestamp(now);
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dump_file << "-0";
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dump_file << std::endl;
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}
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}
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break;
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}
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}
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}
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inline void tmsi_dumper_impl::write_timestamp(tm * now)
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{
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dump_file << boost::format("%d%02d%02d%02d%02d%02d")
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% (now->tm_year + 1900-2000) //year -2000 here after the 1900 leaves you with 15 instead of 2015 (delivery reports format is 150112223501)
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% (now->tm_mon + 1) //month
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% now->tm_mday //day
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% now->tm_hour % now->tm_min % now->tm_sec; //time of day
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return;
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}
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inline int swap(uint8_t c)
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{
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uint8_t temp1, temp2;
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temp1 = c & 0x0F;
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temp2 = c & 0xF0;
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temp1=temp1 << 4;
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temp2=temp2 >> 4;
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return(temp2|temp1);
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}
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void tmsi_dumper_impl::write_imsi(uint8_t * imsi)
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{
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dump_file << boost::format("%1x%02x%02x%02x%02x%02x%02x%02x")
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% (swap(imsi[0]) & 0x0f)
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% swap(imsi[1]) % swap(imsi[2]) % swap(imsi[3]) % swap(imsi[4]) % swap(imsi[5]) % swap(imsi[6]) % swap(imsi[7]);
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return;
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}
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void tmsi_dumper_impl::write_tmsi(uint8_t * tmsi)
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{
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dump_file << boost::format("%02x%02x%02x%02x")
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% (int)tmsi[0] % (int)tmsi[1] % (int)tmsi[2] % (int)tmsi[3];
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return;
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}
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tmsi_dumper::sptr
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tmsi_dumper::make()
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{
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return gnuradio::get_initial_sptr
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(new tmsi_dumper_impl());
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}
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/*
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* The private constructor
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*/
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tmsi_dumper_impl::tmsi_dumper_impl()
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: gr::block("tmsi_dumper",
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gr::io_signature::make(0, 0, 0),
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gr::io_signature::make(0, 0, 0))
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{
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dump_file.open("tmsicount.txt", std::ios_base::app);
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message_port_register_in(pmt::mp("msgs"));
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set_msg_handler(pmt::mp("msgs"), boost::bind(&tmsi_dumper_impl::dump_tmsi, this, boost::placeholders::_1));
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}
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/*
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* Our virtual destructor.
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*/
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tmsi_dumper_impl::~tmsi_dumper_impl()
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{
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dump_file.close();
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}
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} /* namespace gsm */
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} /* namespace gr */
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