From e5ddab3e1d81059f8ace8fddcd4482e089ce56ef Mon Sep 17 00:00:00 2001
From: Roman Khassraf <roman@khassraf.at>
Date: Sun, 4 Dec 2016 16:19:40 +0100
Subject: #240: Implemented block for extraction of information from cipher
 mode command messages

---
 lib/CMakeLists.txt                 |  1 +
 lib/misc_utils/extract_cmc_impl.cc | 90 ++++++++++++++++++++++++++++++++++++++
 lib/misc_utils/extract_cmc_impl.h  | 45 +++++++++++++++++++
 3 files changed, 136 insertions(+)
 create mode 100755 lib/misc_utils/extract_cmc_impl.cc
 create mode 100755 lib/misc_utils/extract_cmc_impl.h

(limited to 'lib')

diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 660bbfd..a0913d9 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -62,6 +62,7 @@ list(APPEND grgsm_sources
     misc_utils/bursts_printer_impl.cc
     misc_utils/extract_system_info_impl.cc
     misc_utils/extract_immediate_assignment_impl.cc
+    misc_utils/extract_cmc_impl.cc
     qa_utils/burst_sink_impl.cc
     qa_utils/burst_source_impl.cc
     qa_utils/message_source_impl.cc
diff --git a/lib/misc_utils/extract_cmc_impl.cc b/lib/misc_utils/extract_cmc_impl.cc
new file mode 100755
index 0000000..b367def
--- /dev/null
+++ b/lib/misc_utils/extract_cmc_impl.cc
@@ -0,0 +1,90 @@
+/* -*- c++ -*- */
+/*
+ * @file
+ * @author 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;
+
+            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;
+    }
+    
+    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 */
diff --git a/lib/misc_utils/extract_cmc_impl.h b/lib/misc_utils/extract_cmc_impl.h
new file mode 100755
index 0000000..fe97f22
--- /dev/null
+++ b/lib/misc_utils/extract_cmc_impl.h
@@ -0,0 +1,45 @@
+/* -*- c++ -*- */
+/*
+ * @file
+ * @author 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.
+ */
+
+#ifndef INCLUDED_GSM_EXTRACT_CMC_IMPL_H
+#define INCLUDED_GSM_EXTRACT_CMC_IMPL_H
+
+#include <grgsm/misc_utils/extract_cmc.h>
+#include <vector>
+
+namespace gr {
+  namespace gsm {          
+    class extract_cmc_impl : public extract_cmc
+    {
+     private:
+      void process_messages(pmt::pmt_t msg);
+      std::vector<int> d_framenumbers;
+      std::vector<int> d_a5_versions;
+     public:
+      virtual std::vector<int> get_framenumbers();
+      virtual std::vector<int> get_a5_versions();
+      extract_cmc_impl();
+      ~extract_cmc_impl();
+    };
+  } // namespace gsm
+} // namespace gr
+#endif /* INCLUDED_GSM_EXTRACT_CMC_IMPL_H */
-- 
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