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047635c30460a8638dc45c7acf5a4be371180047
bigbrother/net_alerter/net_alerter.py
T
Cobra 047635c304 Fix arrival/departure gates dropping LAA MACs; halve ARP scan interval 
The phone/wearable gate used a manual OUI check that missed privately-addressed
MACs (iOS 14+/Android 10+ randomize per network). Any phone not pre-configured
in device_labels was silently enrolled with no alert, causing ARRIVED/OCCUPIED
to never fire. Replacing the gate with is_personal_device() catches OUI, labels,
and LAA bit uniformly.

ARP scan interval drops from 30s to 15s so worst-case arrival detection is 15s.
2026-04-15 15:25:32 -04:00

2205 lines
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#!/usr/bin/env python3
"""
net_alerter.py — Net alerter persistent daemon.
Monitors device presence via DHCP sniffing + Netlink neighbor events.
Zero active probing. No traffic generated.
Three concurrent threads:
1. DHCP sniffer — AF_PACKET raw socket, captures DHCP traffic passively
2. RTM_NEWNEIGH watcher — Netlink socket, kernel pushes new ARP neighbor events
3. RTM_DELNEIGH watcher — Netlink socket, kernel pushes deleted ARP neighbor events
"""
import hashlib
import json
import logging
import os
import re
import socket
import struct
import subprocess
import sys
import threading
import time
import urllib.parse
import urllib.request
import sqlite3
from pathlib import Path
# --- Config (from .env or env vars) ---
LOG_FILE = "/opt/net_alerter/net_alerter.log"
OUI_DB_PATH = "/opt/net_alerter/oui.db"
ENV_PATH = Path(os.getenv("NET_ALERTER_ENV", "/opt/net_alerter/.env"))
BLE_NAMES_FILE = Path("/opt/net_alerter/ble_names.json")
BLE_CORRELATION_WINDOW = 60 # seconds — how far back to look for nearby BLE devices
ARP_SCAN_INTERVAL = int(os.getenv("NET_ALERTER_ARP_SCAN_INTERVAL", "15"))
known_devices = {} # {mac: {ip, hostname, vendor, first_seen, last_seen, infrastructure (opt)}}
known_lock = threading.Lock()
infrastructure_ips = set() # IPs that should never trigger alerts (gateway, broadcast, self)
infrastructure_macs = set() # MACs that should never be treated as personal devices
departure_timers = {} # {mac: threading.Timer} for 15-min departure debounce
departure_lock = threading.Lock() # Protects departure_timers and last_departed_time
last_departed_time = {} # {mac: timestamp} when device was actually alerted as departed
# Passive observation tracking for iOS departure detection
last_seen = {} # {mac: float} — updated by passive ARP/mDNS capture
last_seen_lock = threading.Lock()
# Interface flap detection — suppresses departure storms
_flap_window = [] # [(timestamp, mac)]
_flap_lock = threading.Lock()
_interface_recovering = False
_recovery_timer = None
# Network equipment OUI prefixes (first 3 octets, uppercase no colons)
# Auto-exclusion for known infrastructure devices
NETWORK_EQUIPMENT_OUIS = {
# Ubiquiti
"0418D6", "24A43C", "44D9E7", "68729C", "788A20", "802AA8",
"9C05D6", "DC9FDB", "E063DA", "F09FC2", "6C63F8", "B4FBE4",
"00156D", "002722", "04186F",
# Cisco
"000C29", "001A2F", "001BB1", "001E13", "001F26", "002155",
"0060B0", "00902B", "008024", "0090AB", "00E014", "001011",
# Aruba
"000B86", "00FC8B", "040E3C", "1C28AF", "40E3D6", "6C29D1",
"84D47E", "884774", "94B40F", "AC3744",
# TP-Link
"000AEB", "001777", "1C61B4", "5C63BF", "6046D9", "A84E3F",
"B4B024", "C46AB7", "EC086B", "F81A67",
# Netgear
"001B2F", "00146C", "002196", "00A0CC", "081102", "1C1E29",
"206A8A", "30469A", "4F2AFF", "6CB0CE", "8C3BAD",
# MikroTik
"4C5E0C", "B8069F", "C4AD34", "CC2DE0", "D4CA6D", "E48D8C",
# Ruckus
"000C67", "00249B", "04BD88", "14778B", "2C5D93", "34A84E",
}
# Churn tracking — auto-suppresses devices that cycle 3+ times in 30min
_churn_tracker = {} # {mac: [timestamps of departure events]}
_churn_lock = threading.Lock()
CHURN_THRESHOLD = 3 # cycles in window before suppression
CHURN_WINDOW_SEC = 1800 # 30 minutes
WATCHDOG_TIMEOUT_SEC = int(os.getenv("NET_ALERTER_WATCHDOG_TIMEOUT", "180"))
DEPARTURE_DEBOUNCE_SEC = int(os.getenv("NET_ALERTER_DEPARTURE_DEBOUNCE", "180"))
# Mobile device OUI prefixes for personal device detection
MOBILE_DEVICE_OUIS = {
# Apple
"28A02E", "A4C3F0", "00A0C6", "38C086", "5C4950", "7061D0", "88A29E",
"A81D6A", "A8BBCF", "AC3744", "B0EE7B", "B82DFE", "BC9674", "C8DFC0",
"D4996F", "D8BB85", "E0D55E", "F4CE46", "F8FF9B", "FCFC48",
# Google Pixel
"28876D", "34E5FB", "4C80F3", "70EBF2", "AC16E5", "D0A05F", "E4C547",
# Samsung
"00166B", "001843", "001D67", "001FAF", "0060B0", "084ECE", "0825F3",
"088038", "0A49EF", "0C1432", "0EBB1B", "1851BF", "205C85", "20C18B",
"240A64", "2C5A7B", "32A639", "360DFE", "3A590D", "3CC06C", "441735",
"44B16C", "48D76E", "58D55C", "5C2EE4", "68C903", "6AC4C6", "6EAA0A",
"7045AC", "7499EA", "74D4DD", "781F02", "789098", "7C59B9", "7E0A6D",
# OnePlus
"00166B", "001BF3", "001C47", "002000", "0026F2", "3C28CB", "38DB23",
"42BAFC", "5C55F9", "681E7D", "A8178E", "AA6B1F", "BC1E1A", "EA96D7",
# Xiaomi
"0022AA", "002255", "003677", "3418C2", "48EE0C", "54EF25", "7418DB",
"7C8B5C", "7E4A5D", "868A5A", "8A6FB8", "8C8E14", "8EBE59", "A0871B",
"B8328D", "B832D6", "BA5294", "BC7C47", "C8816D", "E4AF17", "E899C3",
# Huawei
"00E04C", "001097", "001093", "001A2B", "001D3C", "001E37", "001F3E",
"001ECE", "002074", "00207B", "0020E2", "0020F1", "0020F5", "002268",
"002269", "00226A",
# LG
"001E4B", "001E8D", "00218B", "002215", "0022FB", "0023B2", "0023F8",
"002655", "00266C", "00AB8B", "30F9ED", "D8D0DF",
# HTC
"001072", "001058", "0010C6", "001153", "001167", "0011BD", "00121F",
"00121C", "001212", "001236", "00124B", "00131D", "0013D4", "0013E8",
# Motorola
"001555", "001620", "001645", "001693", "0016B8", "001730", "0017F6",
"001822", "001888", "0018F8", "001913", "001985", "001A45", "001A92",
"001AFC",
# Garmin (GPS watches/wearables with WiFi — do not use private MACs)
"086698", "F8B5AB", "E87941", "1430C6", "801F02", "68F3B1", "283B96", "24DEC6",
# Fitbit (wearables with WiFi sync — do not use private MACs)
"E890AC", "88A70E", "E407AA", "A41566", "008B17",
}
# Personal device tracking
personal_devices = set() # {mac: ...} of detected personal device MACs
personal_names = set() # {name: ...} device names for auto-discovery via mDNS
device_labels: dict = {} # {normalized_mac: friendly_name} from NET_ALERTER_DEVICE_LABELS
personal_lock = threading.Lock()
location_occupancy = "UNKNOWN" # Current location state: VACANT, OCCUPIED, UNKNOWN
occupancy_lock = threading.Lock()
# Multi-source device identity store (zero-config enrollment)
# Key: stable identity (BLE Handoff sequence anchor or DHCP Option 55 hash)
# Value: {identity_id, wifi_macs, ble_macs, last_seen, signal_count, enrolled, dhcp_fingerprint, handoff_seq, first_seen}
device_store = {} # {identity_id: device_record}
device_store_lock = threading.RLock()
# BLE advertisement parsing constants
BLE_COMPANY_ID_APPLE = 0x004C # Little-endian in AD structure
BLE_HANDOFF_MSG_TYPE = 0x0C
BLE_HANDOFF_SEQ_OFFSET = 4 # Bytes 4-5 of handoff payload contain seq number
# --- Multi-source device identity functions ---
def _dhcp_fingerprint_hash(option55_bytes: bytes) -> str:
"""Compute stable fingerprint of DHCP Option 55 (Parameter Request List).
Returns hex digest of first 8 bytes of SHA256 hash.
"""
if not option55_bytes:
return ""
return hashlib.sha256(option55_bytes).hexdigest()[:16]
def _create_identity_record(identity_id: str) -> dict:
"""Create a new device identity record."""
return {
'identity_id': identity_id,
'wifi_macs': set(),
'ble_macs': set(),
'last_seen': {}, # {mac: timestamp}
'signal_types': set(), # Set of distinct signal categories: {'ble'} or {'wifi'} or both
'enrolled': False,
'dhcp_fingerprint': "", # DHCP Option 55 fingerprint (hex string)
'handoff_seq': None, # Last BLE Handoff sequence number seen
'first_seen': time.time(),
}
def _fire_active_probes(identity_id: str, mac: str, signal_type: str, dhcp_fp: str) -> None:
"""Disabled — passive-only operation. No active probes sent."""
return
def _fire_active_probes_DISABLED(identity_id: str, mac: str, signal_type: str, dhcp_fp: str) -> None:
def _probe_worker():
try:
with device_store_lock:
if identity_id not in device_store:
return
dev = device_store[identity_id]
# Collect all known MACs for this identity
all_macs = dev['wifi_macs'] | dev['ble_macs']
# Try to find IP from last_seen tracking
ip_for_probe = None
for m in all_macs:
if m in dev['last_seen']:
# Check if we can infer IP from known_devices (if MAC was previously seen)
with known_lock:
if m in known_devices:
ip_for_probe = known_devices[m].get('ip')
break
if ip_for_probe:
logging.info(f"New device identity {identity_id}: firing active probes for IP {ip_for_probe}")
try:
# Attempt ARP ping using subprocess arping (lightweight, no extra deps)
subprocess.run(['arping', '-c', '1', '-w', '1', ip_for_probe],
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, timeout=2)
logging.debug(f"ARP probe sent to {ip_for_probe} (identity {identity_id})")
except (FileNotFoundError, subprocess.TimeoutExpired, Exception):
# arping not available or timed out — try ping as fallback
try:
subprocess.run(['ping', '-c', '1', '-W', '1', ip_for_probe],
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, timeout=2)
logging.debug(f"ICMP ping sent to {ip_for_probe} (identity {identity_id})")
except (subprocess.TimeoutExpired, Exception):
pass
else:
logging.debug(f"New device identity {identity_id}: no IP available for active probes yet")
except Exception as e:
logging.debug(f"Error in active probe thread for {identity_id}: {e}")
# Fire probe in background thread to avoid blocking
probe_thread = threading.Thread(target=_probe_worker, daemon=True)
probe_thread.start()
def _fire_enrollment_callback(identity_id: str) -> None:
"""Called when a device meets enrollment criteria (1+ signal types).
Logs enrollment, sends no alert (silent enrollment).
Caller must hold device_store_lock.
"""
if identity_id not in device_store:
return
dev = device_store[identity_id]
if not dev['enrolled']:
dev['enrolled'] = True
all_macs = dev['wifi_macs'] | dev['ble_macs']
logging.info(f"Device enrolled (multi-source identity {identity_id}): {len(all_macs)} MAC(s), signal_types={dev['signal_types']}")
def _correlate_or_create_identity(mac: str, signal_type: str, dhcp_fp: str = "", handoff_seq: int = None) -> str:
"""
Correlate a MAC with an existing identity or create a new one.
signal_type: "ble", "dhcp", "arp", or "mdns"
Lookup strategy:
0. Check if MAC already exists in any identity's MAC sets
1. If handoff_seq provided, look for matching BLE handoff seq anchor
2. If dhcp_fp provided, look for matching DHCP fingerprint
3. If neither, create new provisional identity
Returns the identity_id (stable key).
"""
with device_store_lock:
# Determine signal category: 'ble', 'mdns', or 'wifi' (for dhcp/arp)
if signal_type == 'ble':
signal_category = 'ble'
elif signal_type == 'mdns':
signal_category = 'mdns'
else: # dhcp, arp
signal_category = 'wifi'
# Strategy 0: Check if MAC already exists in any identity
for iid, dev in device_store.items():
if mac in dev['wifi_macs'] or mac in dev['ble_macs']:
# Found existing identity for this MAC — update instead of creating new
dev['last_seen'][mac] = time.time()
dev['signal_types'].add(signal_category)
logging.debug(f"MAC {mac} already linked to identity {iid}, updated {signal_category} signal")
# Check if meets enrollment criteria: (2+ signal types) OR (mdns present)
if not dev['enrolled'] and len(dev['signal_types']) >= 1:
_fire_enrollment_callback(iid)
return iid
# Strategy 1: Match by BLE Handoff sequence (most stable)
if handoff_seq is not None:
for iid, dev in device_store.items():
if dev['handoff_seq'] == handoff_seq:
# Found matching handoff anchor — add this MAC
dev['ble_macs'].add(mac)
dev['last_seen'][mac] = time.time()
dev['signal_types'].add('ble')
logging.debug(f"BLE MAC rotation detected: {mac} linked to identity {iid} (seq {handoff_seq})")
return iid
# Strategy 2: Match by DHCP fingerprint
if dhcp_fp:
for iid, dev in device_store.items():
if dev['dhcp_fingerprint'] == dhcp_fp and dev['dhcp_fingerprint']:
# Found matching DHCP fingerprint — add this WiFi MAC
if mac not in dev['wifi_macs']:
old_macs = dev['wifi_macs'].copy()
dev['wifi_macs'].add(mac)
dev['last_seen'][mac] = time.time()
if old_macs:
logging.debug(f"MAC rotation (DHCP fingerprint match): {old_macs} → {mac}, identity {iid}")
# Add wifi signal type if not already present
dev['signal_types'].add('wifi')
# Check if meets enrollment criteria: (2+ signal types) OR (mdns present)
if not dev['enrolled'] and len(dev['signal_types']) >= 1:
_fire_enrollment_callback(iid)
return iid
# Strategy 3: Create new provisional identity
# Use DHCP fingerprint or handoff seq as primary key if available, else random
if dhcp_fp:
identity_id = f"dhcp:{dhcp_fp}"
elif handoff_seq is not None:
identity_id = f"ble_seq:{handoff_seq}"
else:
# Provisional identity based on first MAC seen
identity_id = f"prov:{mac}"
# Check if this identity already exists (e.g., multiple mDNS/ARP signals for same MAC)
if identity_id in device_store:
dev = device_store[identity_id]
# Update existing record instead of overwriting
if signal_type == "ble":
dev['ble_macs'].add(mac)
if handoff_seq is not None:
dev['handoff_seq'] = handoff_seq
dev['signal_types'].add('ble')
else:
dev['wifi_macs'].add(mac)
if dhcp_fp:
dev['dhcp_fingerprint'] = dhcp_fp
dev['signal_types'].add(signal_category)
dev['last_seen'][mac] = time.time()
# Check if meets enrollment criteria: (2+ signal types) OR (mdns present)
if not dev['enrolled'] and len(dev['signal_types']) >= 1:
_fire_enrollment_callback(identity_id)
logging.debug(f"Updated device identity {identity_id} with {signal_type} signal (MAC: {mac})")
else:
# Create new identity
dev = _create_identity_record(identity_id)
is_new_identity = True
# Add initial signal
if signal_type == "ble":
dev['ble_macs'].add(mac)
if handoff_seq is not None:
dev['handoff_seq'] = handoff_seq
dev['signal_types'].add('ble')
else:
dev['wifi_macs'].add(mac)
if dhcp_fp:
dev['dhcp_fingerprint'] = dhcp_fp
dev['signal_types'].add(signal_category)
dev['last_seen'][mac] = time.time()
device_store[identity_id] = dev
logging.debug(f"Created new device identity {identity_id} from {signal_type} signal")
# Fire active probes for new identity (non-blocking)
_fire_active_probes(identity_id, mac, signal_type, dhcp_fp)
return identity_id
def _ingest_signal(mac: str, signal_type: str, dhcp_fp: str = "", handoff_seq: int = None) -> str:
"""
Ingest a signal from a device source (BLE, DHCP, ARP, mDNS).
Returns the identity_id it was correlated to.
Handles enrollment when signal_count reaches 2+ from distinct types or when mdns signal is present.
"""
identity_id = _correlate_or_create_identity(mac, signal_type, dhcp_fp, handoff_seq)
with device_store_lock:
if identity_id not in device_store:
return identity_id
dev = device_store[identity_id]
dev['last_seen'][mac] = time.time()
# Enrollment check: if we have (2+ distinct signal types) OR (mdns present) and not yet enrolled
if not dev['enrolled'] and len(dev['signal_types']) >= 1:
_fire_enrollment_callback(identity_id)
# Eviction: if device_store exceeds 500 entries, evict 100 oldest by first_seen
if len(device_store) > 500:
sorted_ids = sorted(device_store.keys(), key=lambda iid: device_store[iid]['first_seen'])
for iid in sorted_ids[:100]:
del device_store[iid]
logging.debug(f"Evicted 100 oldest device identities; store size now {len(device_store)}")
return identity_id
def _check_flap(mac: str) -> bool:
"""Return True if this departure is part of an interface flap (suppress it)."""
global _interface_recovering, _recovery_timer
now = time.time()
with _flap_lock:
_flap_window[:] = [(t, m) for t, m in _flap_window if now - t < 3.0]
_flap_window.append((now, mac))
if len(_flap_window) >= 3 and not _interface_recovering:
_interface_recovering = True
if _recovery_timer:
_recovery_timer.cancel()
_recovery_timer = threading.Timer(60.0, _clear_recovery)
_recovery_timer.daemon = True
_recovery_timer.start()
logging.info("Interface flap detected — suppressing departures for 60s")
return _interface_recovering
def _clear_recovery():
global _interface_recovering
_interface_recovering = False
logging.info("Interface flap recovery window ended")
def _check_churn(mac: str, ip: str) -> bool:
"""Return True and suppress if this device churns too frequently."""
# Explicitly labeled personal devices are never churn-suppressed into infrastructure
with personal_lock:
if mac in device_labels or mac in personal_devices:
return False
now = time.time()
with _churn_lock:
events = _churn_tracker.get(mac, [])
events = [t for t in events if now - t < CHURN_WINDOW_SEC]
events.append(now)
_churn_tracker[mac] = events
if len(events) >= CHURN_THRESHOLD:
infrastructure_ips.add(ip)
logging.info(f"Churn suppression: {ip} (MAC:{mac}) cycled {len(events)}x in {CHURN_WINDOW_SEC//60}min — auto-added to infrastructure")
return True
return False
# Top 200 common device OUI prefixes (MAC first 3 octets)
OUI_DICT = {
"88A29E": "Apple",
"001A7D": "Apple",
"185F3F": "Apple",
"A4C3F0": "Apple",
"0899D8": "Apple",
"004096": "Apple",
"00219B": "Apple",
"0021E9": "Apple",
"005973": "Apple",
"006377": "Apple",
"0064B9": "Apple",
"0084F3": "Apple",
"00A04D": "Apple",
"00D04B": "Apple",
"28879F": "Google",
"2887BA": "Google",
"5427EB": "Google",
"542758": "Google",
"341513": "Amazon",
"0C47C2": "Amazon",
"B827EB": "Raspberry Pi",
"2C56DC": "Raspberry Pi",
"E45F01": "Raspberry Pi",
"000D82": "Intel",
"001025": "Intel",
"001ABA": "Intel",
"001F3B": "Intel",
"001F3C": "Intel",
"001BA9": "Intel",
"001BFB": "Intel",
"001D7A": "Intel",
"001DB8": "Intel",
"001E67": "Intel",
"001F29": "Intel",
"F44DA2": "Intel",
"B03C1C": "Intel",
"00166B": "Qualcomm",
"001BF3": "Qualcomm",
"001C47": "Qualcomm",
"002000": "Qualcomm",
"0026F2": "Qualcomm",
"0026F3": "Qualcomm",
"0026F4": "Qualcomm",
"002618": "Qualcomm",
"FFFFFF": "Espressif",
"687DA8": "Espressif",
"A01D48": "Espressif",
"30AEA4": "Espressif",
"B4E63B": "Espressif",
"80E386": "TP-Link",
"8CBF26": "TP-Link",
"90843F": "TP-Link",
"A838B4": "TP-Link",
"C81F66": "TP-Link",
"DCFEEE": "TP-Link",
"F81A67": "TP-Link",
"689B5A": "Netgear",
"6C46CB": "Netgear",
"78A21B": "Netgear",
"94B3D5": "Netgear",
"B0EE7B": "Netgear",
"B4FBE4": "Netgear",
"C8D7B4": "Netgear",
"D8BB85": "Netgear",
"F8AB05": "Netgear",
"001D2F": "Cisco",
"001930": "Cisco",
"001A2F": "Cisco",
"001C0E": "Cisco",
"001CED": "Cisco",
"001EBD": "Cisco",
"001F6C": "Cisco",
"0021A0": "Cisco",
"002678": "Cisco",
"0026CB": "Cisco",
"00266E": "Cisco",
"00269F": "Cisco",
"0026A6": "Cisco",
"002700": "Cisco",
"0026FA": "Cisco",
"00267B": "Cisco",
"0C1234": "Cisco",
"001BD7": "Dell",
"001BDB": "Dell",
"001A6B": "Dell",
"003067": "Dell",
"00188B": "Dell",
"001B21": "Dell",
"001E67": "Dell",
"0026F7": "Dell",
"00242A": "Dell",
"001C23": "HP",
"001E0B": "HP",
"001EBB": "HP",
"001F2F": "HP",
"001BFC": "HP",
"002219": "HP",
"0022A6": "HP",
"002264": "HP",
"0024A9": "HP",
"0026B9": "HP",
"0026DF": "HP",
"001A6C": "Lenovo",
"001DFB": "Lenovo",
"001F3A": "Lenovo",
"001A73": "Lenovo",
"00238B": "Lenovo",
"002264": "Lenovo",
"00B0D0": "Lenovo",
"9C2EBF": "Lenovo",
"F0DE8D": "Lenovo",
"00E04C": "Huawei",
"001097": "Huawei",
"001093": "Huawei",
"001A2B": "Huawei",
"001D3C": "Huawei",
"001E37": "Huawei",
"001F3E": "Huawei",
"001ECE": "Huawei",
"002074": "Huawei",
"00207B": "Huawei",
"0020E2": "Huawei",
"0020F1": "Huawei",
"0020F5": "Huawei",
"002268": "Huawei",
"002269": "Huawei",
"00226A": "Huawei",
"0022AA": "Xiaomi",
"002255": "Xiaomi",
"003677": "Xiaomi",
"3418C2": "Xiaomi",
"50EB71": "Xiaomi",
"5CF4D4": "Xiaomi",
"78111D": "Xiaomi",
"78E1D3": "Xiaomi",
"A4ABDA": "Xiaomi",
"E4F47A": "Xiaomi",
"F45EAB": "Xiaomi",
"A4D18D": "OnePlus",
"50F5DA": "OnePlus",
"8C03BE": "OnePlus",
"002261": "LG",
"002265": "LG",
"0022D2": "LG",
"0022D3": "LG",
"000426": "LG",
"001854": "LG",
"001E8F": "LG",
"001F5B": "LG",
"002038": "LG",
"0020A6": "LG",
"0020F8": "LG",
"002220": "LG",
"00222D": "LG",
"0027E4": "LG",
"00242C": "LG",
"002531": "LG",
"001054": "Sony",
"001458": "Sony",
"0014EA": "Sony",
"001525": "Sony",
"00188A": "Sony",
"001B44": "Sony",
"00215E": "Sony",
"002178": "Sony",
"0021C5": "Sony",
"002333": "Sony",
"002481": "Sony",
"0026FF": "Sony",
"002702": "Nintendo",
"0008FE": "Nintendo",
"0013F7": "Nintendo",
"001BDB": "Nintendo",
"001EEE": "Nintendo",
"001FEE": "Nintendo",
"0020F8": "Nintendo",
"002095": "Nintendo",
"0020FA": "Nintendo",
"00227B": "Nintendo",
}
def setup_logging():
"""Setup logging to file + stdout."""
formatter = logging.Formatter(
fmt='%(asctime)s [%(levelname)s] %(message)s',
datefmt='%Y-%m-%dT%H:%M:%S'
)
# File handler
Path(LOG_FILE).parent.mkdir(parents=True, exist_ok=True)
file_handler = logging.FileHandler(LOG_FILE)
file_handler.setFormatter(formatter)
# Stdout handler
stdout_handler = logging.StreamHandler(sys.stdout)
stdout_handler.setFormatter(formatter)
logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
logger.addHandler(file_handler)
logger.addHandler(stdout_handler)
return logger
# MAC address validation regex: exactly 12 hex digits (after normalization)
_MAC_RE = re.compile(r'^[0-9A-F]{12}$')
def _normalize_mac(mac: str) -> str:
"""Normalize MAC address: remove colons/hyphens, uppercase. Returns empty string if invalid."""
normalized = mac.replace(":", "").replace("-", "").upper()
if not _MAC_RE.match(normalized):
return ""
return normalized
def load_personal_macs_from_env() -> None:
"""Parse NET_ALERTER_PERSONAL_MACS and NET_ALERTER_PERSONAL_NAMES env vars.
Adds MACs from NET_ALERTER_PERSONAL_MACS to personal_devices set.
Adds device names from NET_ALERTER_PERSONAL_NAMES to personal_names set for mDNS discovery.
"""
macs_str = os.getenv("NET_ALERTER_PERSONAL_MACS", "")
names_str = os.getenv("NET_ALERTER_PERSONAL_NAMES", "")
with personal_lock:
# Load explicit MACs
if macs_str.strip():
macs = [m.strip() for m in macs_str.split(",") if m.strip()]
for mac in macs:
normalized = _normalize_mac(mac)
if not normalized: # Skip invalid MACs
logging.warning(f"Skipping invalid MAC from NET_ALERTER_PERSONAL_MACS: {mac}")
continue
personal_devices.add(normalized)
# Load device names for mDNS auto-discovery
if names_str.strip():
names = [n.strip() for n in names_str.split(",") if n.strip()]
for name in names:
personal_names.add(name)
# Load device labels (MAC=Name pairs for readable alerts)
labels_str = os.getenv("NET_ALERTER_DEVICE_LABELS", "")
if labels_str.strip():
for pair in labels_str.split(","):
if "=" not in pair:
continue
mac_part, _, name_part = pair.partition("=")
normalized = _normalize_mac(mac_part.strip())
if normalized:
device_labels[normalized] = name_part.strip()
# Log summary
if personal_devices or personal_names:
logging.info(f"Loaded {len(personal_devices)} personal device MAC(s) and {len(personal_names)} personal name(s)")
def load_infrastructure_macs_from_env() -> None:
"""Parse NET_ALERTER_INFRA_MACS env var into infrastructure_macs set."""
global infrastructure_macs
macs_str = _read_env_value("NET_ALERTER_INFRA_MACS") or os.getenv("NET_ALERTER_INFRA_MACS", "")
for mac in (m.strip() for m in macs_str.split(",") if m.strip()):
normalized = _normalize_mac(mac)
if normalized:
infrastructure_macs.add(normalized)
logging.info(f"Seeded infrastructure MAC {mac} — excluded from personal device detection")
else:
logging.warning(f"Skipping invalid MAC from NET_ALERTER_INFRA_MACS: {mac}")
def _read_env_value(key: str) -> str:
"""Read a single environment variable from .env file or system env."""
if ENV_PATH.exists():
try:
for line in ENV_PATH.read_text().splitlines():
line = line.strip()
if not line or line.startswith("#"):
continue
if "=" not in line:
continue
k, v = line.split("=", 1)
if k == key:
return v
except Exception as e:
logging.error(f"Failed to read {key} from .env: {e}")
return os.getenv(key, "")
def load_env():
"""Parse .env file manually (key=value), no dependency required.
Note: Matrix credentials (MATRIX_HOMESERVER, MATRIX_ACCESS_TOKEN, MATRIX_ROOM_ID)
are NOT cached in globals. They are read at call time in send_alert() to minimize
credential lifetime in process memory.
"""
if not ENV_PATH.exists():
logging.warning(f".env not found at {ENV_PATH}, using env vars only")
load_personal_macs_from_env()
return
try:
for line in ENV_PATH.read_text().splitlines():
line = line.strip()
if not line or line.startswith("#"):
continue
if "=" not in line:
continue
# Only load non-credential config here
# Credentials are read at call time to minimize exposure
logging.info(f"Loaded config from {ENV_PATH}")
load_personal_macs_from_env()
except Exception as e:
logging.error(f"Failed to load .env: {e}")
def is_personal_device(mac: str) -> bool:
"""
Check if MAC belongs to a phone or wearable.
Three signals, checked in order:
1. Explicit config — device_labels or personal_devices (operator-configured)
2. OUI table — MOBILE_DEVICE_OUIS covers phones + Garmin/Fitbit (no private MACs)
3. LAA bit — locally-administered bit set = iOS 14+/Android 10+ private MAC = phone/watch
"""
mac_normalized = _normalize_mac(mac)
if not mac_normalized:
return False
oui = mac_normalized[:6]
with personal_lock:
if mac_normalized in personal_devices or mac_normalized in device_labels:
return True
if oui in MOBILE_DEVICE_OUIS:
return True
# Infrastructure MACs are never personal, regardless of LAA bit
if mac_normalized in infrastructure_macs:
return False
# Locally-administered bit: modern phones randomize MACs; TVs/infra don't
try:
return bool(int(mac_normalized[:2], 16) & 0x02)
except ValueError:
return False
def lookup_oui(mac: str) -> str:
"""
Look up OUI vendor from MAC address (first 3 octets).
Tries SQLite database first, falls back to inline dictionary.
Returns vendor name or 'unknown' if not found.
"""
if not mac or mac == "00:00:00:00:00:00":
return "unknown"
# Try database first
oui_prefix = mac[:8].lower()
try:
conn = sqlite3.connect(OUI_DB_PATH, timeout=1)
conn.row_factory = sqlite3.Row
cursor = conn.cursor()
result = cursor.execute("SELECT vendor FROM oui WHERE prefix = ?", (oui_prefix,)).fetchone()
conn.close()
if result:
return result['vendor']
except Exception:
# Log at DEBUG only, no output noise
logging.debug(f"OUI database lookup failed for {oui_prefix}", exc_info=False)
# Fall back to inline dictionary
oui_prefix_upper = oui_prefix.replace(":", "").upper()
return OUI_DICT.get(oui_prefix_upper, "unknown")
def seed_from_arp_cache():
"""Read /proc/net/arp, populate known_devices without alerting."""
global known_devices
try:
lines = Path("/proc/net/arp").read_text().splitlines()
for line in lines:
if line.startswith("IP"):
continue
fields = line.split()
if len(fields) < 4:
continue
ip = fields[0]
mac = fields[3].lower()
flags = fields[2]
if mac == "00:00:00:00:00:00" or flags == "0x0":
continue
# Personal devices (phones, wearables — any LAA MAC, known mobile OUI,
# or explicitly labeled MAC) must NOT be silently seeded. The operator
# needs ARRIVED for every device they don't already know about.
if is_personal_device(mac):
with last_seen_lock:
if mac not in last_seen:
last_seen[mac] = time.time()
continue
vendor = lookup_oui(mac)
with known_lock:
if mac not in known_devices:
dev = {
'ip': ip,
'hostname': ip,
'vendor': vendor,
'first_seen': time.time(),
'last_seen': time.time()
}
# Mark infrastructure IPs so they never alert
if ip in infrastructure_ips:
dev['infrastructure'] = True
known_devices[mac] = dev
# Seed last_seen so the watchdog has a baseline.
# Devices that are genuinely active will refresh this via ARP
# requests or mDNS; AP proxy ghosts (only ARP replies) won't.
with last_seen_lock:
if mac not in last_seen:
last_seen[mac] = time.time()
logging.info(f"Seeded {len(known_devices)} devices from ARP cache")
except Exception as e:
logging.error(f"Failed to seed from ARP cache: {e}")
def send_alert(msg: str) -> None:
"""Send alert to Matrix room.
Credentials are read at call time from .env/env vars to minimize
their lifetime in process memory.
"""
token = _read_env_value("MATRIX_ACCESS_TOKEN")
if not token:
logging.warning("No MATRIX_ACCESS_TOKEN set, skipping alert")
return
homeserver = _read_env_value("MATRIX_HOMESERVER") or "https://m.example.org"
room_id = _read_env_value("MATRIX_ROOM_ID")
if not room_id:
logging.warning("No MATRIX_ROOM_ID set, skipping alert")
return
url = (
f"{homeserver}/_matrix/client/v3/rooms/"
f"{urllib.parse.quote(room_id, safe='')}/send/m.room.message"
)
payload = json.dumps({"msgtype": "m.text", "body": msg}).encode()
req = urllib.request.Request(
url,
data=payload,
headers={
"Authorization": f"Bearer {token}",
"Content-Type": "application/json",
"User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36",
},
method="POST",
)
try:
with urllib.request.urlopen(req, timeout=10) as r:
pass
logging.debug(f"Alert sent to Matrix")
except urllib.error.HTTPError as e:
logging.error(f"Matrix send failed with HTTP {e.code}")
except Exception as e:
logging.error(f"Matrix send exception: {e}")
def fmt_duration(secs: float) -> str:
"""Format duration in seconds to human-readable format."""
if secs < 60:
return f"{int(secs)}s"
elif secs < 3600:
m = int(secs // 60)
s = int(secs % 60)
return f"{m}m {s}s" if s else f"{m}m"
else:
h = int(secs // 3600)
m = int((secs % 3600) // 60)
return f"{h}h {m}m" if m else f"{h}h"
def format_arrival(hostname: str, ip: str, vendor: str, mac: str) -> str:
"""Format arrival alert message. Label always wins when set; hostname is fallback."""
label = device_labels.get(_normalize_mac(mac))
display = label or (hostname if hostname and hostname != ip else None)
if display:
return f"[NET] ARRIVED: {display} ({ip})"
return f"[NET] ARRIVED: {ip} [{vendor}] MAC:{mac}"
def format_departure(hostname: str, ip: str, vendor: str, mac: str, duration: str) -> str:
"""Format departure alert message. Label always wins when set; hostname is fallback."""
label = device_labels.get(_normalize_mac(mac))
display = label or (hostname if hostname and hostname != ip else None)
if display:
return f"[NET] DEPARTED: {display} ({ip}) — present {duration}"
return f"[NET] DEPARTED: {ip} [{vendor}] MAC:{mac} — present {duration}"
def _update_occupancy_state_unlocked() -> None:
"""
Internal: Update location occupancy state.
Assumes known_lock AND occupancy_lock are already held by caller.
"""
global location_occupancy
# Delegate to is_personal_device: checks explicit config, OUI table (phones + Garmin/Fitbit),
# and LAA bit (iOS 14+/Android 10+ private MACs). No pre-config needed for modern phones.
_is_personal = is_personal_device
active_enrolled_count = 0
for mac, dev in known_devices.items():
if _is_personal(mac) and not dev.get('departing', False) and dev['ip'] not in infrastructure_ips:
active_enrolled_count += 1
# Determine new occupancy state
new_occupancy = "OCCUPIED" if active_enrolled_count > 0 else "VACANT"
# Fire alert on all transitions including startup UNKNOWN → OCCUPIED
if new_occupancy != location_occupancy:
if new_occupancy == "OCCUPIED":
present = []
for mac, dev in known_devices.items():
if _is_personal(mac) and not dev.get('departing', False) and dev['ip'] not in infrastructure_ips:
label = device_labels.get(_normalize_mac(mac)) or mac[-8:]
present.append(label)
msg = f"[NET] Location: OCCUPIED ({', '.join(present)})"
else:
msg = f"[NET] Location: VACANT"
logging.info(msg)
send_alert(msg)
location_occupancy = new_occupancy
logging.info(f"Location occupancy updated to {location_occupancy} ({active_enrolled_count} personal devices active)")
def update_occupancy_state() -> None:
"""
Update location occupancy state based on presence of personal devices.
Fires Matrix alerts on all VACANT/OCCUPIED transitions including startup.
Thread-safe: acquires locks in order: known_lock, then occupancy_lock.
"""
with known_lock:
with occupancy_lock:
_update_occupancy_state_unlocked()
def _log_ble_correlation(wifi_mac: str) -> None:
"""Log nearby Apple BLE devices seen within BLE_CORRELATION_WINDOW seconds of a WiFi arrival."""
try:
if not BLE_NAMES_FILE.exists():
return
data = json.loads(BLE_NAMES_FILE.read_text())
now = time.time()
nearby = []
for ble_mac, entry in data.items():
age = now - entry.get("last_seen", 0)
if age <= BLE_CORRELATION_WINDOW:
name = entry.get("name", "")
nearby.append(f"{ble_mac}" + (f" ({name})" if name else ""))
if nearby:
logging.info(f"[BLE-CORR] WiFi arrival {wifi_mac} — nearby Apple BLE: {', '.join(nearby)}")
except Exception as e:
logging.debug(f"BLE correlation read failed: {e}")
def on_arrival(mac: str, ip: str, hostname: str = "") -> None:
"""Handle device arrival."""
# Infrastructure IPs never trigger alerts
if ip in infrastructure_ips:
logging.debug(f"Ignoring infrastructure IP {ip} (MAC:{mac})")
return
# OUI-based auto-exclusion for network equipment
oui = mac.replace(":", "").upper()[:6]
if oui in NETWORK_EQUIPMENT_OUIS:
infrastructure_ips.add(ip)
logging.info(f"OUI auto-exclusion: {ip} (MAC:{mac} OUI:{oui}) — network equipment detected")
return
hostname = hostname or ip
now = time.time()
# Lock order: known_lock, then departure_lock, then occupancy_lock
# Extract timers to cancel OUTSIDE all locks to avoid deadlock
timers_to_cancel = []
with departure_lock:
if mac in departure_timers:
timers_to_cancel.append(departure_timers.pop(mac))
# Cancel all timers BEFORE acquiring any other locks
for timer in timers_to_cancel:
timer.cancel()
with known_lock:
with departure_lock:
# Check if device marked departing
if mac in known_devices and known_devices[mac].get('departing'):
depart_initiated = known_devices[mac].get('depart_initiated', now)
absence_secs = now - depart_initiated
if absence_secs < 120:
# True rapid flap (transient Netlink/DHCP event) — suppress
known_devices[mac]['departing'] = False
with occupancy_lock:
_update_occupancy_state_unlocked()
last_departed_time.pop(mac, None)
logging.debug(f"Device {mac} rapid-flap suppressed ({int(absence_secs)}s)")
return
else:
# Watchdog-confirmed absence — real re-arrival, let it alert
logging.debug(f"Device {mac} returning after {int(absence_secs)}s absence — treating as arrival")
known_devices.pop(mac)
last_departed_time.pop(mac, None)
# Log if we cancelled a timer
if timers_to_cancel:
logging.debug(f"Cancelled departure timer for {mac} — device re-arrived before debounce expired")
if mac in last_departed_time:
time_since_departure = now - last_departed_time[mac]
if time_since_departure < 300: # 5 min
logging.debug(f"Suppressing re-arrival alert for {mac} (departed {int(time_since_departure)}s ago)")
# Re-add to known_devices to track presence
if mac not in known_devices:
vendor = lookup_oui(mac)
known_devices[mac] = {
'ip': ip,
'hostname': hostname,
'vendor': vendor,
'first_seen': now,
'last_seen': now
}
else:
known_devices[mac]['last_seen'] = now
with occupancy_lock:
_update_occupancy_state_unlocked()
return
# Still inside known_lock, but not inside departure_lock now
if mac in known_devices:
# Device is already known
dev = known_devices[mac]
dev['last_seen'] = now
# Upgrade from ARP-probe placeholder to real IP
if dev.get('ip') in ('0.0.0.0', 'unknown') and ip not in ('0.0.0.0', 'unknown'):
dev['ip'] = ip
logging.debug(f"Updated {mac} IP from placeholder to {ip}")
# DHCP renewal dedup: if last_seen < 30 min, skip alert
if now - dev['first_seen'] < 1800: # 30 min
logging.debug(f"Skipping DHCP renewal alert for {mac} (seen {int(now - dev['first_seen'])}s ago)")
with occupancy_lock:
_update_occupancy_state_unlocked()
return
# Not a re-arrival, update last_seen and don't alert (already known)
with occupancy_lock:
_update_occupancy_state_unlocked()
return
# New device
vendor = lookup_oui(mac)
known_devices[mac] = {
'ip': ip,
'hostname': hostname,
'vendor': vendor,
'first_seen': now,
'last_seen': now
}
# Only alert for phones/wearables. Everything else is enrolled silently.
if not is_personal_device(mac):
logging.debug(f"Silent enroll {mac} — not a phone/wearable")
update_occupancy_state()
return
# Delay alert 2 seconds so mDNS can update the hostname before we send.
# The timer callback reads from known_devices at fire time to get the real name.
def _send_arrival_alert():
with known_lock:
dev = known_devices.get(mac)
if dev is None:
return # Device departed before timer fired
resolved_hostname = dev.get('hostname', hostname)
resolved_ip = dev.get('ip', ip)
resolved_vendor = dev.get('vendor', vendor)
msg = format_arrival(resolved_hostname, resolved_ip, resolved_vendor or "unknown", mac)
logging.info(msg)
send_alert(msg)
_log_ble_correlation(mac)
update_occupancy_state()
t = threading.Timer(2.0, _send_arrival_alert)
t.daemon = True
t.start()
def on_departure(mac: str) -> None:
"""
Handle device departure with debounce.
Only sends alert if device still gone after DEPARTURE_DEBOUNCE_SEC.
"""
with known_lock:
if mac not in known_devices:
return
# Check if infrastructure IP (never alert)
dev = known_devices[mac]
if dev['ip'] in infrastructure_ips:
logging.debug(f"Ignoring departure for infrastructure IP {dev['ip']} (MAC:{mac})")
return
# Only alert departure for phones/wearables
if not is_personal_device(mac):
known_devices.pop(mac, None)
logging.debug(f"Silent depart {mac} — not a phone/wearable")
return
# Check if this is part of an interface flap (suppress simultaneous mass-departure)
if _check_flap(mac):
logging.debug(f"Flap suppression: ignoring departure for {mac}")
return
# Churn-based auto-suppression: if device cycles 3+ times in 30min, suppress
if _check_churn(mac, dev['ip']):
return
dev_copy = dev.copy()
# Mark departing instead of popping — allows re-arrival to detect and cancel timer
known_devices[mac]['departing'] = True
known_devices[mac]['depart_initiated'] = time.time()
# Start departure debounce timer
# Extract timer to cancel outside of lock to avoid deadlock
timer_to_cancel = None
with departure_lock:
# Cancel any existing timer for this MAC
if mac in departure_timers:
timer_to_cancel = departure_timers.pop(mac)
# Cancel outside lock
if timer_to_cancel:
timer_to_cancel.cancel()
with departure_lock:
def send_departure_alert():
"""Callback to send alert after debounce expires."""
# Lock order: known_lock, then departure_lock, then occupancy_lock
with known_lock:
if not known_devices.get(mac, {}).get('departing'):
return # device re-arrived, departure was cancelled
# Device still departed — send alert and remove from tracking
known_devices.pop(mac, None)
with departure_lock:
last_departed_time[mac] = time.time()
if mac in departure_timers:
del departure_timers[mac]
# Update occupancy state after device removal (still inside known_lock)
with occupancy_lock:
_update_occupancy_state_unlocked()
duration = fmt_duration(time.time() - dev_copy['first_seen'])
msg = format_departure(dev_copy['hostname'], dev_copy['ip'], dev_copy['vendor'] or "unknown", mac, duration)
logging.info(msg)
send_alert(msg)
timer = threading.Timer(float(DEPARTURE_DEBOUNCE_SEC), send_departure_alert)
timer.daemon = True
timer.name = f'departure-debounce-{mac}'
departure_timers[mac] = timer
timer.start()
logging.debug(f"Departure debounce started for {mac}, will alert in {DEPARTURE_DEBOUNCE_SEC}s if still gone")
def get_primary_interface() -> str:
"""Get primary network interface (not lo)."""
try:
with open('/proc/net/route') as f:
for line in f.readlines()[1:]:
parts = line.split()
if len(parts) > 1 and parts[0] != 'lo' and parts[1] == '00000000':
return parts[0]
with open('/proc/net/route') as f:
for line in f.readlines()[1:]:
parts = line.split()
if parts[0] != 'lo':
return parts[0]
except Exception:
pass
return 'eth0'
def get_local_ip(iface: str) -> str:
"""Get the local IP address for the given interface."""
try:
import subprocess
result = subprocess.run(['ip', 'addr', 'show', iface], capture_output=True, text=True, timeout=5)
if result.returncode == 0:
for line in result.stdout.split('\n'):
if 'inet ' in line:
parts = line.strip().split()
if len(parts) >= 2:
ip_with_mask = parts[1]
ip = ip_with_mask.split('/')[0]
return ip
except Exception as e:
logging.warning(f"Failed to get local IP for {iface}: {e}")
return ""
def seed_infrastructure_ips(iface: str) -> None:
"""
Seed infrastructure IPs that should never trigger alerts.
Seeding steps:
1. Self IP (this device's interface IP)
2. Gateway IP (from 'ip route show default')
3. Broadcast IP (x.x.x.255)
4. Network equipment by OUI (Ubiquiti, Cisco, Aruba, TP-Link, Netgear, MikroTik, Ruckus)
5. Operator-provided IPs via NET_ALERTER_INFRA_IPS env var (comma-separated)
NET_ALERTER_INFRA_IPS is a post-deploy configuration for operators to add
infrastructure IPs known after deployment (access points, switches, etc).
"""
global infrastructure_ips
infrastructure_ips.clear()
# Get self IP
self_ip = get_local_ip(iface)
if self_ip:
infrastructure_ips.add(self_ip)
logging.info(f"Seeded self IP {self_ip} as infrastructure")
# Read gateway from 'ip route show default'
try:
import subprocess
result = subprocess.run(['ip', 'route', 'show', 'default'], capture_output=True, text=True, timeout=5)
if result.returncode == 0:
# Parse: default via 10.0.0.0 dev eth0 proto dhcp metric 100
for line in result.stdout.strip().split('\n'):
if 'via' in line:
parts = line.split()
for i, part in enumerate(parts):
if part == 'via' and i + 1 < len(parts):
gateway_ip = parts[i + 1]
infrastructure_ips.add(gateway_ip)
logging.info(f"Seeded gateway {gateway_ip} as infrastructure")
break
except Exception as e:
logging.warning(f"Failed to read gateway: {e}")
# Add broadcast (x.x.x.255 for most networks)
if self_ip:
try:
parts = self_ip.rsplit('.', 1)
if len(parts) == 2:
broadcast_ip = parts[0] + ".255"
infrastructure_ips.add(broadcast_ip)
logging.info(f"Seeded broadcast {broadcast_ip} as infrastructure")
except Exception:
pass
# Auto-exclude known network equipment by OUI
with known_lock:
for mac, dev in list(known_devices.items()):
oui = mac.replace(":", "").upper()[:6]
if oui in NETWORK_EQUIPMENT_OUIS:
infrastructure_ips.add(dev['ip'])
logging.info(f"OUI auto-exclusion: {dev['ip']} (MAC:{mac} OUI:{oui}) — network equipment detected")
logging.info(f"Infrastructure IPs: {infrastructure_ips}")
# Allow operator to add additional IPs via env var (comma-separated)
extra = os.environ.get("NET_ALERTER_INFRA_IPS", "")
for ip in (x.strip() for x in extra.split(",") if x.strip()):
infrastructure_ips.add(ip)
logging.info(f"Seeded extra infrastructure IP {ip} from env")
def _get_iface_mac(iface: str) -> bytes:
"""Return interface MAC as 6 bytes, or zero bytes on failure."""
try:
raw = open(f"/sys/class/net/{iface}/address").read().strip()
return bytes(int(x, 16) for x in raw.split(':'))
except Exception:
return b'\x00' * 6
def arp_scanner(iface: str) -> None:
"""Active ARP scan thread.
Sends ARP who-has to every IP in the local /24 subnet every ARP_SCAN_INTERVAL
seconds. Every device that replies triggers on_arrival, bypassing AP ARP proxy.
This is the reliable presence detection path for devices with existing DHCP leases
that never broadcast ARP on their own.
"""
logging.info(f"ARP scanner started on {iface} (interval={ARP_SCAN_INTERVAL}s)")
src_mac = _get_iface_mac(iface)
while True:
try:
src_ip = get_local_ip(iface)
if not src_ip:
time.sleep(ARP_SCAN_INTERVAL)
continue
prefix = '.'.join(src_ip.split('.')[:3])
src_ip_b = socket.inet_aton(src_ip)
broadcast = b'\xff\xff\xff\xff\xff\xff'
sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(0x0806))
sock.bind((iface, 0))
sock.settimeout(0.1)
# Send ARP who-has for every IP in the /24
for i in range(1, 255):
target_ip = f"{prefix}.{i}"
if target_ip == src_ip:
continue
eth = broadcast + src_mac + b'\x08\x06'
arp = struct.pack('!HHBBH', 1, 0x0800, 6, 4, 1)
arp += src_mac + src_ip_b + b'\x00' * 6 + socket.inet_aton(target_ip)
try:
sock.send(eth + arp)
except Exception:
pass
# Collect replies for 2 seconds
deadline = time.time() + 2.0
while time.time() < deadline:
try:
data = sock.recv(60)
if len(data) < 42 or data[12:14] != b'\x08\x06':
continue
if struct.unpack('!H', data[20:22])[0] != 2: # opcode must be reply
continue
sender_mac = ':'.join(f'{b:02x}' for b in data[22:28])
sender_ip = socket.inet_ntoa(data[28:32])
if sender_mac in ('00:00:00:00:00:00', 'ff:ff:ff:ff:ff:ff'):
continue
_update_last_seen(sender_mac)
on_arrival(sender_mac, sender_ip)
except socket.timeout:
continue
except Exception:
break
sock.close()
except Exception as e:
logging.error(f"ARP scanner error: {e}")
time.sleep(ARP_SCAN_INTERVAL)
def _find_monitor_iface(primary_iface: str) -> str:
"""Return a second WiFi interface name for monitor mode, or '' if none found."""
try:
result = subprocess.run(['iw', 'dev'], capture_output=True, text=True, timeout=5)
for line in result.stdout.splitlines():
line = line.strip()
if line.startswith('Interface '):
iface = line.split()[1]
if iface != primary_iface:
return iface
except Exception:
pass
return ''
def _enable_monitor_mode(iface: str) -> bool:
"""Put iface into 802.11 monitor mode. Returns True on success."""
try:
subprocess.run(['ip', 'link', 'set', iface, 'down'],
check=True, capture_output=True, timeout=5)
subprocess.run(['iw', 'dev', iface, 'set', 'type', 'monitor'],
check=True, capture_output=True, timeout=5)
subprocess.run(['ip', 'link', 'set', iface, 'up'],
check=True, capture_output=True, timeout=5)
return True
except Exception as e:
logging.warning(f"Monitor mode setup failed on {iface}: {e}")
return False
def _parse_80211_frame(frame: bytes) -> None:
"""Parse a radiotap+802.11 frame and call on_arrival for transmitting personal devices.
addr2 is always the transmitter. We care about:
- Management frames from stations (assoc req subtype=0, auth subtype=11)
- Data frames with ToDS=1 (station → AP)
Probe requests (subtype=4) are excluded — modern iOS uses random MACs for those.
"""
try:
if len(frame) < 4 or frame[0] != 0: # radiotap version must be 0
return
rt_len = struct.unpack_from('<H', frame, 2)[0]
if rt_len > len(frame) - 24:
return
dot11 = frame[rt_len:]
if len(dot11) < 24:
return
fc = struct.unpack_from('<H', dot11, 0)[0]
frame_type = (fc >> 2) & 0x3
frame_subtype = (fc >> 4) & 0xF
# addr2 = transmitter (bytes 10-15)
src_mac = ':'.join(f'{b:02x}' for b in dot11[10:16])
if src_mac in ('00:00:00:00:00:00', 'ff:ff:ff:ff:ff:ff'):
return
is_station_tx = False
if frame_type == 0 and frame_subtype in (0, 11): # assoc req, auth
is_station_tx = True
elif frame_type == 2: # data
to_ds = (fc >> 8) & 0x1
from_ds = (fc >> 9) & 0x1
if to_ds and not from_ds: # STA → AP
is_station_tx = True
if not is_station_tx:
return
_update_last_seen(src_mac)
if not is_personal_device(src_mac):
return
with known_lock:
already_known = src_mac in known_devices
if not already_known:
on_arrival(src_mac, 'unknown')
except Exception:
pass
def monitor_sniffer(iface: str) -> None:
"""802.11 monitor mode sniffer thread.
Reads raw radiotap+802.11 frames and calls on_arrival for personal devices
seen transmitting. Bypasses AP entirely — works even when AP proxy hides
all ARP/DHCP traffic.
"""
if not _enable_monitor_mode(iface):
logging.warning(f"Monitor mode unavailable on {iface}, monitor sniffer disabled")
return
logging.info(f"Monitor mode sniffer started on {iface}")
try:
sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(0x0003))
sock.bind((iface, 0))
sock.settimeout(1.0)
except Exception as e:
logging.error(f"Monitor mode socket failed on {iface}: {e}")
return
while True:
try:
frame = sock.recv(2048)
_parse_80211_frame(frame)
except socket.timeout:
continue
except Exception as e:
logging.debug(f"Monitor sniffer recv error: {e}")
time.sleep(0.1)
def ble_sniffer() -> None:
"""
BLE sniffer thread.
Parses Apple Continuity Protocol Handoff advertisements to track device identity
across BLE MAC rotations using monotonically-incrementing sequence numbers.
Attempts HCI raw socket first, falls back to hcidump subprocess.
Thread exits gracefully on hardware errors.
"""
try:
# Try raw HCI socket approach
try:
s = socket.socket(socket.AF_BLUETOOTH, socket.SOCK_RAW, socket.BTPROTO_HCI)
s.bind((0,)) # Bind to hci0 (first controller)
# Set HCI filter to receive LE Meta events only (simplification: receive all for now)
# This would require HCI_FILTER socket option, but basic approach is simpler
logging.info("BLE sniffer started (HCI raw socket)")
while True:
try:
data = s.recv(4096)
_parse_hci_event(data)
except Exception as e:
logging.debug(f"HCI socket error: {e}")
time.sleep(1)
except (FileNotFoundError, PermissionError, OSError) as e:
logging.debug(f"HCI socket unavailable ({type(e).__name__}), trying hcidump fallback")
# Fallback: run hcidump subprocess and parse output
try:
proc = subprocess.Popen(
['hcidump', '-R', '-i', 'hci0'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
text=False,
bufsize=0
)
logging.info("BLE sniffer started (hcidump subprocess)")
while True:
line = proc.stdout.readline()
if not line:
break
try:
# hcidump outputs hex dumps; parse them
_parse_hcidump_line(line)
except Exception:
pass
except FileNotFoundError:
logging.warning("hcidump not found; BLE sniffing unavailable (install bluez)")
return
except Exception as e:
logging.error(f"BLE sniffer fatal error: {e}")
def _parse_hci_event(data: bytes) -> None:
"""Parse HCI event packet for LE Meta events with Apple Continuity data."""
try:
# HCI packet: type (1) + data
# This is a simplified implementation; full HCI parsing is complex
# For now, we'll use the hcidump fallback which is more reliable
pass
except Exception:
pass
def _parse_hcidump_line(line: bytes) -> None:
"""Parse a line from hcidump output to extract Apple Continuity Handoff data.
hcidump -R outputs hex dumps like:
> 04 3E 2B 02 01 00 19 00 01 02 03 04 05 06 07 08 ...
Extracts BLE MAC and Handoff sequence number, then calls _ingest_signal().
Returns None silently if parsing fails (incomplete packet).
"""
try:
# Parse hcidump hex output: skip leading ">" or "<" and split on whitespace
hex_str = line.decode('utf-8', errors='replace').strip()
if not hex_str or hex_str[0] not in '><':
return
# Extract hex bytes
hex_parts = hex_str[1:].split()
data = bytes([int(h, 16) for h in hex_parts if h])
if len(data) < 7:
return # Too short for HCI LE advertising report
# Check for LE Meta Event (HCI packet type 04, HCI event 3E)
if data[0] != 0x04 or data[1] != 0x3E:
return
# Skip HCI event header: type(1) event(1) len(1) subevt(1) = 4 bytes
if len(data) < 12: # Need at least event header + minimal adv report
return
# HCI_LE_Meta_Event (0x3E), subevent is at offset 3
subevent = data[3]
if subevent != 0x02: # LE Advertising Report subevent
return
# LE Advertising Report structure: subevent(1) num_reports(1) event_type(1) addr_type(1) addr(6) len(1) data(variable)
if len(data) < 13: # Minimum for header + MAC
return
num_reports = data[4]
if num_reports < 1:
return
event_type = data[5]
addr_type = data[6]
# Extract BLE MAC (6 bytes, little-endian on wire)
ble_mac_raw = data[7:13]
ble_mac = ':'.join(f'{b:02x}' for b in reversed(ble_mac_raw))
# Advertisement data length
if len(data) < 14:
return
ad_data_len = data[13]
if len(data) < 14 + ad_data_len:
return # Incomplete packet
# Parse advertisement data for Apple Company ID (0x004C little-endian = 4C 00)
ad_data = data[14:14 + ad_data_len]
offset = 0
while offset < len(ad_data) - 1:
ad_len = ad_data[offset]
if ad_len == 0 or offset + 1 + ad_len > len(ad_data):
break
ad_type = ad_data[offset + 1]
ad_payload = ad_data[offset + 2:offset + 1 + ad_len]
# Look for Manufacturer Specific Data (type 0xFF) with Apple Company ID (0x004C)
if ad_type == 0xFF and len(ad_payload) >= 2:
company_id = struct.unpack('<H', ad_payload[:2])[0]
if company_id == BLE_COMPANY_ID_APPLE and len(ad_payload) >= BLE_HANDOFF_SEQ_OFFSET + 2:
# Check for Handoff message type (0x0C)
if ad_payload[2] == BLE_HANDOFF_MSG_TYPE:
# Extract sequence number from bytes 4-5 (big-endian)
seq = struct.unpack('!H', ad_payload[BLE_HANDOFF_SEQ_OFFSET:BLE_HANDOFF_SEQ_OFFSET + 2])[0]
_ingest_signal(ble_mac, 'ble', handoff_seq=seq)
return
offset += 1 + ad_len
except Exception:
return # Silently fail on malformed packets
def dhcp_sniffer(iface: str) -> None:
"""
DHCP sniffer thread.
AF_PACKET raw socket, captures DHCP traffic passively.
"""
try:
s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(0x0003))
s.bind((iface, 0))
logging.info(f"DHCP sniffer started on {iface}")
while True:
try:
data, _ = s.recvfrom(65535)
parse_frame(data)
except Exception as e:
logging.error(f"DHCP sniffer error: {e}")
time.sleep(1)
except Exception as e:
logging.error(f"Failed to start DHCP sniffer: {e}")
def _update_last_seen(mac: str) -> None:
"""Update the last_seen timestamp for a MAC address (passive observation)."""
with last_seen_lock:
last_seen[mac] = time.time()
def _extract_mdns_hostname(payload: bytes) -> str:
"""Scan mDNS DNS payload for an A record with a .local name. Returns display name (sans .local) or ''."""
try:
if len(payload) < 12:
return ""
qdcount = struct.unpack('!H', payload[4:6])[0]
ancount = struct.unpack('!H', payload[6:8])[0]
nscount = struct.unpack('!H', payload[8:10])[0]
arcount = struct.unpack('!H', payload[10:12])[0]
offset = 12
for _ in range(min(qdcount, 50)):
offset = _skip_dns_name(payload, offset)
if offset is None or offset + 4 > len(payload):
return ""
offset += 4
for _ in range(min(ancount + nscount + arcount, 200)):
if offset is None or offset + 10 > len(payload):
break
name_offset = offset
offset = _skip_dns_name(payload, offset)
if offset is None or offset + 10 > len(payload):
break
record_type = struct.unpack('!H', payload[offset:offset+2])[0]
rdlen = struct.unpack('!H', payload[offset+8:offset+10])[0]
offset += 10
if record_type == 1: # A record — name is the device hostname
name = _extract_dns_name(payload, name_offset)
if name and name.endswith('.local'):
return name[:-6]
if offset + rdlen > len(payload):
break
offset += rdlen
except Exception:
pass
return ""
def _parse_mdns_for_names(payload: bytes, mac: str) -> None:
"""Parse mDNS DNS message to extract PTR/SRV/A record names and check against personal_names.
If a record name matches a name in personal_names, add the source MAC to personal_devices.
"""
try:
if len(payload) < 12: # DNS header minimum size
return
# DNS header: ID(2) Flags(2) QDCOUNT(2) ANCOUNT(2) NSCOUNT(2) ARCOUNT(2)
qdcount = struct.unpack('!H', payload[4:6])[0]
ancount = struct.unpack('!H', payload[6:8])[0]
# Skip questions section (we only care about answers/records)
offset = 12
for _ in range(qdcount):
offset = _skip_dns_name(payload, offset)
if offset is None or offset + 4 > len(payload):
return
offset += 4 # QTYPE + QCLASS
# Parse answers/authority/additional records
nscount = struct.unpack('!H', payload[8:10])[0]
arcount = struct.unpack('!H', payload[10:12])[0]
# Cap total records to prevent unbounded loop on crafted packets
total_records = min(ancount + nscount + arcount, 1000)
for _ in range(total_records):
if offset is None or offset + 10 > len(payload):
break
# Parse record name
name_offset = offset
offset = _skip_dns_name(payload, offset)
if offset is None:
break
# Parse TYPE(2) CLASS(2) TTL(4) RDLEN(2)
if offset + 10 > len(payload):
break
record_type, record_class, ttl, rdlen = struct.unpack('!HHIH', payload[offset:offset+10])
offset += 10
# Extract the name string from the record
name = _extract_dns_name(payload, name_offset)
if name:
# A record (type 1): record name IS the Bonjour hostname (e.g. Johns-iPhone.local)
# Update known_devices hostname if currently unset or just an IP address
if record_type == 1 and name.endswith('.local'):
display_name = name[:-6] # strip .local
mac_normalized = _normalize_mac(mac)
if mac_normalized and display_name:
with known_lock:
dev = known_devices.get(mac_normalized)
if dev:
current = dev.get('hostname', '')
# Only overwrite if hostname is an IP or unset
try:
socket.inet_aton(current)
is_ip = True
except Exception:
is_ip = not current or current == mac_normalized
if is_ip or not current:
dev['hostname'] = display_name
logging.debug(f"mDNS hostname update: {mac_normalized} → {display_name}")
if personal_names:
with personal_lock:
for pname in personal_names:
if pname.lower() in name.lower():
mac_normalized = _normalize_mac(mac)
if mac_normalized:
personal_devices.add(mac_normalized)
logging.debug(f"mDNS auto-discovery: added {mac_normalized} for name match '{pname}' in '{name}'")
break
# Skip RDATA
if offset + rdlen > len(payload):
break
offset += rdlen
except Exception as e:
logging.debug(f"mDNS parse error: {e}")
def _skip_dns_name(payload: bytes, offset: int) -> int:
"""Skip a DNS name in the payload, handling compression pointers. Returns new offset or None on error."""
try:
while offset < len(payload):
length = payload[offset]
if length == 0:
return offset + 1
if (length & 0xC0) == 0xC0: # Pointer
return offset + 2
offset += 1 + length
return None
except Exception:
return None
def _extract_dns_name(payload: bytes, offset: int) -> str:
"""Extract a DNS name from payload at offset. Handles compression pointers."""
try:
parts = []
visited = set()
while offset < len(payload):
if offset in visited: # Prevent infinite loops
break
visited.add(offset)
length = payload[offset]
offset += 1
if length == 0:
break
elif (length & 0xC0) == 0xC0: # Pointer
if offset >= len(payload):
break
pointer_offset = struct.unpack('!H', bytes([(length & 0x3F), payload[offset]]))[0]
# Bounds check before recursing: pointer must not point backwards or beyond payload
if pointer_offset >= offset or pointer_offset >= len(payload):
break
offset = pointer_offset
continue
# Regular label
if offset + length > len(payload):
break
label = payload[offset:offset + length].decode('utf-8', errors='replace')
parts.append(label)
offset += length
return '.'.join(parts) if parts else ""
except Exception:
return ""
def parse_frame(data: bytes) -> None:
"""Parse Ethernet frame: ARP, mDNS, and DHCP packets for passive observation and event triggering."""
try:
if len(data) < 14:
return
# Ethernet frame — extract source MAC (bytes 6:12)
src_mac = ':'.join(f'{b:02x}' for b in data[6:12])
# Ethernet type field
eth_type = struct.unpack('!H', data[12:14])[0]
# Branch A: ARP frame (ethertype 0x0806)
if eth_type == 0x0806:
opcode = struct.unpack('!H', data[20:22])[0] if len(data) >= 22 else 0
# Opcode 1 (request) is a genuine device signal.
# Opcode 2 (reply) may be an AP ARP proxy forgery — EXCEPT for explicitly
# labeled personal devices where we trust the frame regardless, because
# iPhones with privacy MACs often only emit opcode=2 after initial association.
with personal_lock:
is_labeled = _normalize_mac(src_mac) in device_labels
if opcode == 1 or (opcode == 2 and is_labeled):
_update_last_seen(src_mac)
# Personal devices first seen via ARP get no DHCP/Netlink event.
# Fire on_arrival so they get ARRIVED alert and occupancy counts.
if is_personal_device(src_mac) and len(data) >= 32:
with known_lock:
already_known = src_mac in known_devices
if not already_known:
spa = socket.inet_ntoa(data[28:32])
on_arrival(src_mac, spa)
# Ingest ARP signal for multi-source device identity
_ingest_signal(src_mac, 'arp')
return
# For IP frames, extract IP header info
if eth_type != 0x0800: # not IPv4
return
# IP header
if len(data) < 23:
return
proto = data[23]
if proto != 17: # not UDP
return
# UDP header
if len(data) < 38:
return
src_port = struct.unpack('!H', data[34:36])[0]
dst_port = struct.unpack('!H', data[36:38])[0]
# Branch B: mDNS frame (IPv4 UDP dst port 5353)
if dst_port == 5353:
_update_last_seen(src_mac)
# mDNS is the primary arrival indicator for Apple devices — they send it
# on WiFi join before or instead of DHCP. Fire on_arrival so the device
# gets an ARRIVED alert and is counted in occupancy.
if len(data) >= 30:
src_ip = socket.inet_ntoa(data[26:30])
with known_lock:
already_known = src_mac in known_devices
if not already_known:
# Try to extract Bonjour hostname from this frame before alerting
mdns_hostname = _extract_mdns_hostname(data[42:]) if len(data) >= 42 else ""
on_arrival(src_mac, src_ip, mdns_hostname)
# Ingest mDNS signal for multi-source device identity
_ingest_signal(src_mac, 'mdns')
# Parse mDNS DNS message for device names (updates hostname on subsequent frames)
if len(data) >= 42:
_parse_mdns_for_names(data[42:], src_mac)
return
# Branch C: DHCP frame (UDP ports 67/68)
if not (src_port in (67, 68) and dst_port in (67, 68)):
return
# DHCP payload (starts at byte 42)
if len(data) < 42:
return
dhcp = data[42:]
if len(dhcp) < 236:
return
# MAC address (chaddr at offset 28, 6 bytes)
mac_bytes = dhcp[28:34]
mac = ':'.join(f'{b:02x}' for b in mac_bytes)
if mac in ('00:00:00:00:00:00', 'ff:ff:ff:ff:ff:ff'):
return
# Update last_seen for DHCP packets
_update_last_seen(mac)
# Parse DHCP options (start at byte 240)
if len(dhcp) < 240:
return
msg_type = None
hostname = ""
requested_ip = ""
ciaddr = socket.inet_ntoa(dhcp[12:16])
dhcp_option55 = None # Parameter Request List for device fingerprinting
i = 240
while i < len(dhcp):
opt = dhcp[i]
if opt == 255:
break
if opt == 0:
i += 1
continue
if i + 1 >= len(dhcp):
break
length = dhcp[i + 1]
if i + 2 + length > len(dhcp):
break
val = dhcp[i + 2:i + 2 + length]
if opt == 53 and length == 1: # DHCP message type
msg_type = val[0]
elif opt == 12: # Hostname
hostname = val.decode('utf-8', errors='replace').strip('\x00')
elif opt == 50 and length == 4: # Requested IP
requested_ip = socket.inet_ntoa(val)
elif opt == 55: # Parameter Request List (Option 55)
# Bounds check already done above; safe to use val
dhcp_option55 = val
i += 2 + length
# Ingest DHCP signal for multi-source device identity
if msg_type in (1, 3) and dhcp_option55:
dhcp_fp = _dhcp_fingerprint_hash(dhcp_option55)
_ingest_signal(mac, 'dhcp', dhcp_fp=dhcp_fp)
# Process based on message type
if msg_type in (1, 3): # Discover or Request (arrival)
ip = requested_ip or ciaddr
if ip and ip != '0.0.0.0':
on_arrival(mac, ip, hostname)
elif msg_type == 7: # Release (departure)
on_departure(mac)
except Exception as e:
logging.debug(f"Frame parse error: {e}")
# Netlink constants
NETLINK_ROUTE = 0
RTMGRP_NEIGH = 0x4
RTM_NEWNEIGH = 28
RTM_DELNEIGH = 29
NUD_REACHABLE = 0x02
NUD_STALE = 0x04
NUD_DELAY = 0x08
NUD_PROBE = 0x10
NDA_DST = 1
NDA_LLADDR = 2
def netlink_watcher() -> None:
"""
Netlink watcher thread.
Kernel pushes RTM_NEWNEIGH and RTM_DELNEIGH events.
"""
try:
s = socket.socket(socket.AF_NETLINK, socket.SOCK_RAW, NETLINK_ROUTE)
s.bind((os.getpid(), RTMGRP_NEIGH))
logging.info("Netlink neighbor watcher started")
while True:
try:
data = s.recv(65535)
parse_netlink(data)
except Exception as e:
logging.error(f"Netlink watcher error: {e}")
time.sleep(1)
except Exception as e:
logging.error(f"Failed to start Netlink watcher: {e}")
def parse_netlink(data: bytes) -> None:
"""Parse Netlink neighbor messages."""
try:
offset = 0
while offset < len(data):
if offset + 16 > len(data):
break
nlmsg_len, nlmsg_type, _, _, _ = struct.unpack_from('=IHHII', data, offset)
if nlmsg_len < 16:
break
payload = data[offset + 16:offset + nlmsg_len]
if nlmsg_type in (RTM_NEWNEIGH, RTM_DELNEIGH):
parse_ndmsg(payload, nlmsg_type)
offset += (nlmsg_len + 3) & ~3
except Exception as e:
logging.debug(f"Netlink parse error: {e}")
def parse_ndmsg(data: bytes, msg_type: int) -> None:
"""Parse ndmsg (neighbor discovery message)."""
try:
if len(data) < 12:
return
state = struct.unpack_from('=H', data, 8)[0]
mac = None
ip = None
offset = 12
while offset + 4 <= len(data):
rta_len, rta_type = struct.unpack_from('=HH', data, offset)
if rta_len < 4:
break
val = data[offset + 4:offset + rta_len]
if rta_type == NDA_LLADDR and len(val) == 6:
mac = ':'.join(f'{b:02x}' for b in val)
elif rta_type == NDA_DST:
if len(val) == 4:
ip = socket.inet_ntoa(val)
offset += (rta_len + 3) & ~3
if not mac or mac in ('00:00:00:00:00:00', 'ff:ff:ff:ff:ff:ff'):
return
if msg_type == RTM_NEWNEIGH and (state & NUD_REACHABLE):
on_arrival(mac, ip or 'unknown')
elif msg_type == RTM_DELNEIGH:
on_departure(mac)
except Exception as e:
logging.debug(f"ndmsg parse error: {e}")
def personal_watchdog() -> None:
"""Watchdog thread: fires on_departure for personal devices silent > WATCHDOG_TIMEOUT_SEC.
Monitors last_seen timestamps for personal devices and triggers departure alerts
if a device goes silent for longer than the configured timeout.
"""
while True:
try:
time.sleep(60) # Check every minute
now = time.time()
# Track all personal devices currently in known_devices (not just enrolled set)
with known_lock:
tracked = {mac for mac in known_devices if is_personal_device(mac)}
for mac in tracked:
# Get last_seen timestamp
with last_seen_lock:
ts = last_seen.get(mac)
if ts is None:
continue
# Check if device is silent
if now - ts > WATCHDOG_TIMEOUT_SEC:
# Only fire if device is currently known and not already departing
should_depart = False
with known_lock:
if mac in known_devices and not known_devices[mac].get('departing'):
should_depart = True
if should_depart:
logging.info(f"Watchdog: personal device {mac} silent >{WATCHDOG_TIMEOUT_SEC}s, triggering departure")
on_departure(mac)
except Exception as e:
logging.error(f"Watchdog thread error: {e}")
def main() -> None:
"""Main entry point."""
logger = setup_logging()
load_env()
iface = get_primary_interface()
logging.info(f"Net alerter starting on interface {iface}")
seed_infrastructure_ips(iface)
load_infrastructure_macs_from_env()
seed_from_arp_cache()
# Start monitor threads
threads = [
threading.Thread(target=dhcp_sniffer, args=(iface,), daemon=True, name='dhcp-sniffer'),
threading.Thread(target=netlink_watcher, daemon=True, name='netlink-watcher'),
threading.Thread(target=personal_watchdog, daemon=True, name='personal-watchdog'),
threading.Thread(target=ble_sniffer, daemon=True, name='ble-sniffer'),
threading.Thread(target=arp_scanner, args=(iface,), daemon=True, name='arp-scanner'),
]
monitor_iface = _find_monitor_iface(iface)
if monitor_iface:
logging.info(f"Monitor mode interface found: {monitor_iface}")
threads.append(threading.Thread(target=monitor_sniffer, args=(monitor_iface,), daemon=True, name='monitor-sniffer'))
for t in threads:
t.start()
logging.info("Net alerter running — DHCP sniffer + Netlink neighbor watcher + personal watchdog + BLE sniffer + ARP scanner active")
# Keep main thread alive
try:
while True:
time.sleep(60)
with known_lock:
num_known = len(known_devices)
with device_store_lock:
num_identities = len(device_store)
enrolled_count = sum(1 for d in device_store.values() if d['enrolled'])
logging.debug(f"Tracking {num_known} legacy devices; {num_identities} device identities ({enrolled_count} enrolled)")
except KeyboardInterrupt:
logging.info("Shutting down")
sys.exit(0)
if __name__ == '__main__':
main()
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