| #!/usr/bin/env python |
| # -*- coding: utf-8 -*- |
| # @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. |
| # |
| # |
| |
| from gnuradio import blocks |
| from gnuradio import eng_notation |
| from gnuradio import gr |
| from gnuradio.eng_option import eng_option |
| from optparse import OptionParser, OptionGroup |
| import collections |
| import grgsm |
| import pmt |
| import socket |
| |
| |
| class grgsm_decoder(gr.top_block): |
| |
| def __init__(self, timeslot=0, subslot=None, chan_mode='BCCH', |
| burst_file=None, |
| cfile=None, fc=939.4e6, samp_rate=2e6, arfcn=None, |
| a5=1, a5_kc=None, |
| speech_file=None, speech_codec=None, |
| verbose=False): |
| |
| gr.top_block.__init__(self, "Gr-gsm Decode") |
| |
| ################################################## |
| # Parameters |
| ################################################## |
| self.timeslot = timeslot |
| self.subslot = subslot |
| self.chan_mode = chan_mode |
| self.burst_file = burst_file |
| self.cfile = cfile |
| self.fc = fc |
| self.samp_rate = samp_rate |
| self.arfcn = arfcn |
| self.a5 = a5 |
| self.kc = a5_kc |
| if len(a5_kc) < 8: |
| self.kc = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00] |
| self.speech_file = speech_file |
| self.speech_codec = speech_codec |
| self.verbose = verbose |
| |
| ################################################## |
| # Blocks |
| ################################################## |
| |
| if self.burst_file: |
| self.burst_file_source = grgsm.burst_file_source(burst_file) |
| elif self.cfile: |
| self.file_source = blocks.file_source(gr.sizeof_gr_complex*1, self.cfile, False) |
| self.receiver = grgsm.receiver(4, ([0]), ([])) |
| self.input_adapter = grgsm.gsm_input( |
| ppm=0, |
| osr=4, |
| fc=fc, |
| samp_rate_in=samp_rate, |
| ) |
| self.offset_control = grgsm.clock_offset_control(fc) |
| |
| self.dummy_burst_filter = grgsm.dummy_burst_filter() |
| self.timeslot_filter = grgsm.burst_timeslot_filter(self.timeslot) |
| |
| self.subslot_filter = None |
| if self.chan_mode == 'BCCH_SDCCH4' and self.subslot is not None: |
| self.subslot_filter = grgsm.burst_sdcch_subslot_filter(grgsm.SS_FILTER_SDCCH4, self.subslot) |
| elif self.chan_mode == 'SDCCH8' and self.subslot is not None: |
| self.subslot_filter = grgsm.burst_sdcch_subslot_filter(grgsm.SS_FILTER_SDCCH8, self.subslot) |
| |
| if self.chan_mode == 'BCCH': |
| self.bcch_demapper = grgsm.universal_ctrl_chans_demapper(self.timeslot, |
| ([2, 6, 12, 16, 22, 26, 32, 36, 42, 46]), |
| ([1, 2, 2, 2, 2, 2, 2, 2, 2, 2])) |
| elif self.chan_mode == 'BCCH_SDCCH4': |
| self.bcch_sdcch4_demapper = grgsm.universal_ctrl_chans_demapper(self.timeslot, |
| ([2, 6, 12, 16, 22, 26, 32, 36, 42, 46]), |
| ([1, 2, 2, 2, 7, 7, 7, 7, 135, 135])) |
| elif self.chan_mode == 'SDCCH8': |
| self.sdcch8_demapper = grgsm.universal_ctrl_chans_demapper(self.timeslot, |
| ([0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44]), |
| ([8, 8, 8, 8, 8, 8, 8, 8, 136, 136, 136, 136])) |
| elif self.chan_mode == 'TCHF': |
| self.tch_f_demapper = grgsm.tch_f_chans_demapper(self.timeslot) |
| self.tch_f_decoder = grgsm.tch_f_decoder(speech_codec, speech_file) |
| |
| if self.kc != [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]: |
| self.decryption = grgsm.decryption(self.kc, self.a5) |
| self.cch_decoder_decrypted = grgsm.control_channels_decoder() |
| if self.chan_mode == 'TCHF': |
| self.decryption_tch_sacch = grgsm.decryption(self.kc, self.a5) |
| |
| self.cch_decoder = grgsm.control_channels_decoder() |
| |
| self.socket_pdu = blocks.socket_pdu("UDP_CLIENT", "127.0.0.1", "4729", 10000, False) |
| if self.verbose: |
| self.message_printer = grgsm.message_printer(pmt.intern(""), True, True, False) |
| |
| |
| ################################################## |
| # Asynch Message Connections |
| ################################################## |
| |
| if self.burst_file: |
| self.msg_connect(self.burst_file_source, "out", self.dummy_burst_filter, "in") |
| elif self.cfile: |
| self.connect((self.file_source, 0), (self.input_adapter, 0)) |
| self.connect((self.input_adapter, 0), (self.receiver, 0)) |
| self.msg_connect(self.offset_control, "ppm", self.input_adapter, "ppm_in") |
| self.msg_connect(self.receiver, "measurements", self.offset_control, "measurements") |
| self.msg_connect(self.receiver, "C0", self.dummy_burst_filter, "in") |
| |
| self.msg_connect(self.dummy_burst_filter, "out", self.timeslot_filter, "in") |
| |
| if (self.chan_mode == 'BCCH_SDCCH4' or self.chan_mode == 'SDCCH8') and self.subslot_filter is not None: |
| self.msg_connect(self.timeslot_filter, "out", self.subslot_filter, "in") |
| |
| if self.chan_mode == 'BCCH': |
| if self.subslot_filter is not None: |
| self.msg_connect(self.subslot_filter, "out", self.bcch_demapper, "bursts") |
| else: |
| self.msg_connect(self.timeslot_filter, "out", self.bcch_demapper, "bursts") |
| |
| self.msg_connect(self.bcch_demapper, "bursts", self.cch_decoder, "bursts") |
| self.msg_connect(self.cch_decoder, "msgs", self.socket_pdu, "pdus") |
| if self.verbose: |
| self.msg_connect(self.cch_decoder, "msgs", self.message_printer, "msgs") |
| |
| elif self.chan_mode == 'BCCH_SDCCH4': |
| if self.subslot_filter is not None: |
| self.msg_connect(self.subslot_filter, "out", self.bcch_sdcch4_demapper, "bursts") |
| else: |
| self.msg_connect(self.timeslot_filter, "out", self.bcch_sdcch4_demapper, "bursts") |
| |
| if self.kc != [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]: |
| self.msg_connect(self.bcch_sdcch4_demapper, "bursts", self.decryption, "bursts") |
| self.msg_connect(self.decryption, "bursts", self.cch_decoder_decrypted, "bursts") |
| self.msg_connect(self.cch_decoder_decrypted, "msgs", self.socket_pdu, "pdus") |
| if self.verbose: |
| self.msg_connect(self.cch_decoder_decrypted, "msgs", self.message_printer, "msgs") |
| |
| self.msg_connect(self.bcch_sdcch4_demapper, "bursts", self.cch_decoder, "bursts") |
| self.msg_connect(self.cch_decoder, "msgs", self.socket_pdu, "pdus") |
| if self.verbose: |
| self.msg_connect(self.cch_decoder, "msgs", self.message_printer, "msgs") |
| |
| elif self.chan_mode == 'SDCCH8': |
| if self.subslot_filter is not None: |
| self.msg_connect(self.subslot_filter, "out", self.sdcch8_demapper, "bursts") |
| else: |
| self.msg_connect(self.timeslot_filter, "out", self.sdcch8_demapper, "bursts") |
| |
| if self.kc != [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]: |
| self.msg_connect(self.sdcch8_demapper, "bursts", self.decryption, "bursts") |
| self.msg_connect(self.decryption, "bursts", self.cch_decoder_decrypted, "bursts") |
| self.msg_connect(self.cch_decoder_decrypted, "msgs", self.socket_pdu, "pdus") |
| if self.verbose: |
| self.msg_connect(self.cch_decoder_decrypted, "msgs", self.message_printer, "msgs") |
| |
| self.msg_connect(self.sdcch8_demapper, "bursts", self.cch_decoder, "bursts") |
| self.msg_connect(self.cch_decoder, "msgs", self.socket_pdu, "pdus") |
| if self.verbose: |
| self.msg_connect(self.cch_decoder, "msgs", self.message_printer, "msgs") |
| |
| elif self.chan_mode == 'TCHF': |
| self.msg_connect(self.timeslot_filter, "out", self.tch_f_demapper, "bursts") |
| if self.kc != [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]: |
| self.msg_connect(self.tch_f_demapper, "acch_bursts", self.decryption_tch_sacch, "bursts") |
| self.msg_connect(self.tch_f_demapper, "tch_bursts", self.decryption, "bursts") |
| |
| self.msg_connect(self.decryption_tch_sacch, "bursts", self.cch_decoder, "bursts") |
| self.msg_connect(self.decryption, "bursts", self.tch_f_decoder, "bursts") |
| else: |
| self.msg_connect(self.tch_f_demapper, "acch_bursts", self.cch_decoder, "bursts") |
| self.msg_connect(self.tch_f_demapper, "tch_bursts", self.tch_f_decoder, "bursts") |
| |
| self.msg_connect(self.tch_f_decoder, "msgs", self.socket_pdu, "pdus") |
| self.msg_connect(self.cch_decoder, "msgs", self.socket_pdu, "pdus") |
| if self.verbose: |
| self.msg_connect(self.tch_f_decoder, "msgs", self.message_printer, "msgs") |
| self.msg_connect(self.cch_decoder, "msgs", self.message_printer, "msgs") |
| |
| |
| if __name__ == '__main__': |
| |
| # List of channel configurations |
| channel_modes = ['BCCH', 'BCCH_SDCCH4', 'SDCCH8', 'TCHF'] |
| |
| # mapping options to grgsm's enums |
| tch_codecs = collections.OrderedDict([ |
| ('FR', grgsm.TCH_FS), |
| ('EFR', grgsm.TCH_EFR), |
| ('AMR12.2', grgsm.TCH_AFS12_2), |
| ('AMR10.2', grgsm.TCH_AFS10_2), |
| ('AMR7.95', grgsm.TCH_AFS7_95), |
| ('AMR7.4', grgsm.TCH_AFS7_4), |
| ('AMR6.7', grgsm.TCH_AFS6_7), |
| ('AMR5.9', grgsm.TCH_AFS5_9), |
| ('AMR5.15', grgsm.TCH_AFS5_15), |
| ('AMR4.75', grgsm.TCH_AFS4_75) |
| ]) |
| |
| kc = [] |
| |
| parser = OptionParser(option_class=eng_option, usage="%prog: [options]") |
| |
| def kc_callback(option, opt_str, value, parser): |
| |
| """ Callback function that parses Kc """ |
| |
| # format 0x12,0x34,0x56,0x78,0x90,0xAB,0xCD,0xEF |
| if ',' in value: |
| value_str = value.split(',') |
| |
| for s in value_str: |
| val = int(s, 16) |
| if val < 0 or val > 255: |
| parser.error("Invalid Kc % s\n" % s) |
| kc.append(val) |
| if len(kc) != 8: |
| parser.error("Invalid Kc length") |
| # format: 1234567890ABCDEF |
| elif len(value) == 16: |
| for i in range(8): |
| s = value[2*i: 2*i + 2] |
| val = int(s, 16) |
| if val < 0 or val > 255: |
| parser.error("Invalid Kc % s\n" % s) |
| kc.append(val) |
| else: |
| parser.error("Invalid Kc format") |
| |
| # define options |
| parser.add_option("-m", "--mode", dest="chan_mode", default='BCCH', |
| type='choice', choices=channel_modes, |
| help="Channel mode. Valid options are 'BCCH' (Non-combined C0), " |
| "'BCCH_SDCCH4'(Combined C0), 'SDCCH8' (Stand-alone control channel) " |
| "and 'TCHF' (Traffic Channel, Full rate) ") |
| parser.add_option("-t", "--timeslot", dest="timeslot", type="intx", default=0, |
| help="Timeslot to decode [default=%default]") |
| parser.add_option("-u", "--subslot", dest="subslot", type="intx", |
| help="Subslot to decode. Use in combination with channel type BCCH_SDCCH4 and SDCCH8") |
| parser.add_option("-b", "--burst-file", dest="burst_file", help="Input file (bursts)") |
| parser.add_option("-c", "--cfile", dest="cfile", help="Input file (cfile)") |
| parser.add_option("-v", "--verbose", action="store_true", |
| help="If set, the decoded messages (with frame number and count) are printed to stdout") |
| |
| # group cfile options together |
| cfile_options = OptionGroup( |
| parser, 'Cfile Options', 'Options for decoding cfile input.', |
| ) |
| cfile_options.add_option("-f", "--fc", dest="fc", type="eng_float", |
| help="Frequency of cfile capture [default=eng_notation.num_to_str(939.4e6)]") |
| cfile_options.add_option("-a", "--arfcn", dest="arfcn", type="intx", |
| help="Set ARFCN instead of frequency. " |
| "In some cases you may have to provide the GSM band also") |
| cfile_options.add_option("--band", dest="band", |
| help="Specify the GSM band for the frequency.\nAvailable bands are: " |
| + ", ".join(grgsm.arfcn.get_bands()) + "." |
| + "If no band is specified, it will be determined automatically, defaulting to 0.") |
| cfile_options.add_option("-s", "--samp-rate", dest="samp_rate", type="eng_float", |
| default=eng_notation.num_to_str(2e6), |
| help="Sample rate of cfile capture [default=%default]") |
| parser.add_option_group(cfile_options) |
| |
| # group decryption options |
| decryption_options = OptionGroup( |
| parser, 'Decryption Options', 'Options for setting the A5 decryption parameters.', |
| ) |
| decryption_options.add_option("-e", "--a5", dest="a5", type="intx", default=1, |
| help="A5 version [default=%default]. A5 versions 1 - 3 supported") |
| decryption_options.add_option("-k", "--kc", action="callback", callback=kc_callback, type="string", |
| help="A5 session key Kc. Valid formats are " |
| "'0x12,0x34,0x56,0x78,0x90,0xAB,0xCD,0xEF' and '1234567890ABCDEF'") |
| parser.add_option_group(decryption_options) |
| |
| # group TCH options |
| tch_options = OptionGroup( |
| parser, 'TCH Options', 'Options for setting Traffic channel decoding parameters.', |
| ) |
| tch_options.add_option("-d", "--speech-codec", dest="speech_codec", default='FR', |
| type='choice', choices=tch_codecs.keys(), |
| help="TCH-F speech codec [default=%default]. " |
| "Valid options are " + ", ".join(tch_codecs.keys())) |
| tch_options.add_option("-o", "--output-tch", dest="speech_output_file", default="/tmp/speech.au.gsm", |
| help="TCH/F speech output file [default=%default].") |
| parser.add_option_group(tch_options) |
| |
| # parse |
| (options, args) = parser.parse_args() |
| |
| # some verifications |
| if (options.cfile is None and options.burst_file is None) or \ |
| (options.cfile is not None and options.burst_file is not None): |
| parser.error("Please provide a cfile or a burst file (but not both) as input\n") |
| |
| if options.timeslot < 0 or options.timeslot > 7: |
| parser.error("Invalid timeslot. Must be a in range 0-7\n") |
| |
| if options.subslot is not None and (options.subslot < 0 or options.subslot > 7): |
| parser.error("Invalid subslot. Must be a in range 0-7\n") |
| |
| if options.a5 < 0 or options.a5 > 3: |
| parser.error("Invalid A5 version\n") |
| |
| if options.cfile and (options.fc is None and options.arfcn is None) or (options.fc is not None and options.arfcn is not None): |
| parser.error("You have to provide either a frequency or an ARFCN (but not both).\n") |
| |
| # handle frequency / arfcn input |
| arfcn = 0 |
| fc = 939.4e6 |
| if options.arfcn: |
| if options.band: |
| if options.band not in grgsm.arfcn.get_bands(): |
| parser.error("Invalid GSM band\n") |
| elif not grgsm.arfcn.is_valid_arfcn(options.arfcn, options.band): |
| parser.error("ARFCN is not valid in the specified band\n") |
| else: |
| arfcn = options.arfcn |
| fc = grgsm.arfcn.arfcn2downlink(arfcn, options.band) |
| else: |
| arfcn = options.arfcn |
| for band in grgsm.arfcn.get_bands(): |
| if grgsm.arfcn.is_valid_arfcn(arfcn, band): |
| fc = grgsm.arfcn.arfcn2downlink(arfcn, band) |
| break |
| elif options.fc: |
| fc = options.fc |
| if options.band: |
| if options.band not in grgsm.arfcn.get_bands(): |
| parser.error("Invalid GSM band\n") |
| elif not grgsm.arfcn.is_valid_downlink(options.fc, options.band): |
| parser.error("Frequency is not valid in the specified band\n") |
| else: |
| arfcn = grgsm.arfcn.downlink2arfcn(options.fc, options.band) |
| else: |
| for band in grgsm.arfcn.get_bands(): |
| if grgsm.arfcn.is_valid_downlink(options.fc, band): |
| arfcn = grgsm.arfcn.downlink2arfcn(options.fc, band) |
| break |
| |
| # open udp port 4729 to avoid icmp messages |
| sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) |
| sock.bind(("localhost", 4729)) |
| |
| # instanciate decoder |
| tb = grgsm_decoder(timeslot=options.timeslot, subslot=options.subslot, chan_mode=options.chan_mode, |
| burst_file=options.burst_file, |
| cfile=options.cfile, arfcn=arfcn, fc=fc, samp_rate=options.samp_rate, |
| a5=options.a5, a5_kc=kc, |
| speech_file=options.speech_output_file, speech_codec=tch_codecs.get(options.speech_codec), |
| verbose=options.verbose) |
| |
| # run |
| tb.start() |
| tb.wait() |
| |
| # we are done, close socket |
| sock.close() |