112 lines
3.5 KiB
Python
112 lines
3.5 KiB
Python
"""
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Support for fetching WiFi associations through SNMP.
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For more details about this platform, please refer to the documentation at
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https://home-assistant.io/components/device_tracker.snmp/
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"""
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import binascii
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import logging
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import threading
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from datetime import timedelta
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from homeassistant.components.device_tracker import DOMAIN
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from homeassistant.const import CONF_HOST
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from homeassistant.helpers import validate_config
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from homeassistant.util import Throttle
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# Return cached results if last scan was less then this time ago.
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MIN_TIME_BETWEEN_SCANS = timedelta(seconds=10)
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_LOGGER = logging.getLogger(__name__)
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REQUIREMENTS = ['pysnmp==4.2.5']
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CONF_COMMUNITY = "community"
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CONF_BASEOID = "baseoid"
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# pylint: disable=unused-argument
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def get_scanner(hass, config):
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"""Validate the configuration and return an snmp scanner."""
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if not validate_config(config,
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{DOMAIN: [CONF_HOST, CONF_COMMUNITY, CONF_BASEOID]},
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_LOGGER):
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return None
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scanner = SnmpScanner(config[DOMAIN])
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return scanner if scanner.success_init else None
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class SnmpScanner(object):
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"""Queries any SNMP capable Access Point for connected devices."""
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def __init__(self, config):
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"""Initialize the scanner."""
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from pysnmp.entity.rfc3413.oneliner import cmdgen
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self.snmp = cmdgen.CommandGenerator()
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self.host = cmdgen.UdpTransportTarget((config[CONF_HOST], 161))
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self.community = cmdgen.CommunityData(config[CONF_COMMUNITY])
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self.baseoid = cmdgen.MibVariable(config[CONF_BASEOID])
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self.lock = threading.Lock()
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self.last_results = []
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# Test the router is accessible
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data = self.get_snmp_data()
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self.success_init = data is not None
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def scan_devices(self):
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"""Scan for new devices and return a list with found device IDs."""
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self._update_info()
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return [client['mac'] for client in self.last_results
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if client.get('mac')]
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# Supressing no-self-use warning
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# pylint: disable=R0201
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def get_device_name(self, device):
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"""Return the name of the given device or None if we don't know."""
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# We have no names
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return None
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@Throttle(MIN_TIME_BETWEEN_SCANS)
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def _update_info(self):
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"""Ensure the information from the WAP is up to date.
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Return boolean if scanning successful.
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"""
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if not self.success_init:
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return False
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with self.lock:
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data = self.get_snmp_data()
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if not data:
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return False
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self.last_results = data
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return True
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def get_snmp_data(self):
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"""Fetch MAC addresses from WAP via SNMP."""
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devices = []
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errindication, errstatus, errindex, restable = self.snmp.nextCmd(
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self.community, self.host, self.baseoid)
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if errindication:
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_LOGGER.error("SNMPLIB error: %s", errindication)
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return
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if errstatus:
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_LOGGER.error('SNMP error: %s at %s', errstatus.prettyPrint(),
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errindex and restable[-1][int(errindex)-1] or '?')
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return
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for resrow in restable:
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for _, val in resrow:
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mac = binascii.hexlify(val.asOctets()).decode('utf-8')
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_LOGGER.debug('Found mac %s', mac)
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mac = ':'.join([mac[i:i+2] for i in range(0, len(mac), 2)])
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devices.append({'mac': mac})
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return devices
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