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| 1 | +"""Finds nearby strangers. Basically a low-pass filter that alerts on infrequently seen (or unseen) nearby devices.""" |
| 2 | +import os |
| 3 | +import time |
| 4 | +import pickle |
| 5 | +import datetime |
| 6 | + |
| 7 | +__author__ = 'Caleb Madrigal' |
| 8 | + |
| 9 | +__version__ = '0.0.1' |
| 10 | +__apiversion__ = 1 |
| 11 | +__config__ = {'power': -100, 'trigger_cooldown': 60, 'channel_switch_scheme': 'round_robin', 'time_per_channel': 0.1} |
| 12 | + |
| 13 | +DEVS_TO_IGNORE = {'ff:ff:ff:ff:ff:ff', '00:00:00:00:00:00'} |
| 14 | +POWER_THRESHOLD = -50 |
| 15 | +TIME_THRESHOLD = 15 * 60 # 15 minutes |
| 16 | +SAVE_PERIOD = 30 # seconds |
| 17 | +SAVE_FILE = 'find_nearby_strangers.pkl' |
| 18 | + |
| 19 | + |
| 20 | +class Trigger: |
| 21 | + def __init__(self): |
| 22 | + self.mac_to_seen = {} |
| 23 | + self.last_save = time.time() |
| 24 | + if os.path.exists(SAVE_FILE): |
| 25 | + with open(SAVE_FILE, 'rb') as f: |
| 26 | + self.mac_to_seen = pickle.load(f) |
| 27 | + print('Loaded {} devices from disk: {}'.format(len(self.mac_to_seen), list(self.mac_to_seen.keys()))) |
| 28 | + |
| 29 | + def __call__(self, dev_id=None, dev_type=None, power=None, vendor=None, **kwargs): |
| 30 | + # Only look at individual devices (device and bssids), and only look when power is present |
| 31 | + if ((not power) or |
| 32 | + (not dev_id) or |
| 33 | + (dev_type == 'ssid') or |
| 34 | + (dev_id in DEVS_TO_IGNORE) or |
| 35 | + (power < POWER_THRESHOLD)): |
| 36 | + return |
| 37 | + |
| 38 | + seen_first_time = False |
| 39 | + |
| 40 | + if dev_id not in self.mac_to_seen: |
| 41 | + seen_first_time = True |
| 42 | + last_seen = time.time() |
| 43 | + self.mac_to_seen[dev_id] = [last_seen] |
| 44 | + else: |
| 45 | + last_seen = self.mac_to_seen[dev_id][-1] |
| 46 | + self.mac_to_seen[dev_id].append(time.time()) |
| 47 | + |
| 48 | + if time.time() - last_seen > TIME_THRESHOLD: |
| 49 | + self.alert_stranger(dev_id, vendor, last_seen, power) |
| 50 | + elif seen_first_time: |
| 51 | + self.alert_stranger(dev_id, vendor, last_seen, power, first_seen=True) |
| 52 | + |
| 53 | + if time.time() - self.last_save > SAVE_PERIOD: |
| 54 | + self.save_to_disk() |
| 55 | + |
| 56 | + def alert_stranger(self, dev_id, vendor, last_seen, power, first_seen=False): |
| 57 | + # visual indicator |
| 58 | + if first_seen: |
| 59 | + msg = '[!] ' |
| 60 | + else: |
| 61 | + msg = '[*] ' |
| 62 | + |
| 63 | + # timestamp |
| 64 | + msg += '{} - '.format(str(datetime.datetime.now().replace(microsecond=0))) |
| 65 | + |
| 66 | + # device id |
| 67 | + msg += '{} '.format(dev_id) |
| 68 | + if vendor: |
| 69 | + msg += '({}) '.format(vendor) |
| 70 | + |
| 71 | + # spotted at |
| 72 | + msg += 'spotted at {:+d} '.format(power) |
| 73 | + |
| 74 | + # last seen |
| 75 | + if first_seen: |
| 76 | + msg += '(never before seen)' |
| 77 | + else: |
| 78 | + msg += '(last seen {} seconds ago)'.format(int(time.time() - last_seen)) |
| 79 | + |
| 80 | + # actually display msg |
| 81 | + print(msg) |
| 82 | + |
| 83 | + def save_to_disk(self): |
| 84 | + with open(SAVE_FILE, 'wb') as f: |
| 85 | + pickle.dump(self.mac_to_seen, f) |
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