Module: PWN::SDR::Decoder::DECT

Defined in:
lib/pwn/sdr/decoder/dect.rb

Overview

Pure-Ruby DECT (1.88–1.90 GHz EU / 1.92–1.93 GHz US) activity detector.

1.152 Mbit/s GFSK across 10 TDMA carriers — native mode reports slot bursts (417 μs) and derives carrier index from freq_obj. parse_line retained for offline text analysis.

Class Method Summary collapse

Class Method Details

.authors ⇒ Object

Author(s)

0day Inc. support@0dayinc.com



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# File 'lib/pwn/sdr/decoder/dect.rb', line 50

public_class_method def self.authors
  "AUTHOR(S):\n  0day Inc. <support@0dayinc.com>\n"
end

.decode(opts = {}) ⇒ Object

Supported Method Parameters

PWN::SDR::Decoder::DECT.decode( freq_obj: 'required - freq_obj returned from PWN::SDR::GQRX.init_freq' )



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# File 'lib/pwn/sdr/decoder/dect.rb', line 17

public_class_method def self.decode(opts = {})
  freq_obj = opts[:freq_obj]
  hz = PWN::SDR.hz_to_i(freq: freq_obj[:freq])
  ch = ((1_897_344_000 - hz) / 1_728_000.0).round.clamp(0, 9)
  PWN::SDR::Decoder::Base.run_detector(
    freq_obj: freq_obj,
    protocol: 'DECT',
    note: '1.152 Mbit/s GFSK 24-slot TDMA — native mode reports slot bursts and carrier index.',
    threshold: 7.0,
    describe: proc { |b|
      slots = (b[:duration_ms] / 0.417).round
      { modulation: 'GFSK', carrier: ch, tdma_slots: slots, classification: slots >= 24 ? 'FP-beacon-frame' : 'PP-burst' }
    }
  )
end

.help ⇒ Object

Display Usage for this Module



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# File 'lib/pwn/sdr/decoder/dect.rb', line 56

public_class_method def self.help
  puts "USAGE (ruby-native detector, no external binaries):
    #{self}.decode(
      freq_obj: 'required - freq_obj returned from PWN::SDR::GQRX.init_freq'
    )

    #{self}.parse_line(line: 'RFPI: 01 23 45 67 89 slot 4 carrier 3')

    #{self}.authors
  "
end

.parse_line(opts = {}) ⇒ Object

Supported Method Parameters

PWN::SDR::Decoder::DECT.parse_line(line: 'RFPI: 01 23 45 67 89 slot 4 carrier 3 RSSI -55')



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# File 'lib/pwn/sdr/decoder/dect.rb', line 36

public_class_method def self.parse_line(opts = {})
  line = opts[:line].to_s
  out  = { protocol: 'DECT' }
  out[:rfpi]    = ::Regexp.last_match(1).delete(' ') if line =~ /RFPI[:=]?\s*((?:[0-9A-Fa-f]{2}\s*){5})/
  out[:slot]    = ::Regexp.last_match(1) if line =~ /slot\s*(\d+)/i
  out[:carrier] = ::Regexp.last_match(1) if line =~ /carrier\s*(\d+)/i
  out[:rssi]    = ::Regexp.last_match(1) if line =~ /RSSI[:=]?\s*(-?\d+)/i
  out[:role]    = ::Regexp.last_match(1) if line =~ /\b(FP|PP)\b/
  out[:summary] = "DECT RFPI=#{out[:rfpi]} slot=#{out[:slot]} carrier=#{out[:carrier]}"
  out.compact
end