135 lines
4.2 KiB
Python
135 lines
4.2 KiB
Python
"""
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homeassistant.components.device_tracker.nmap
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Device tracker platform that supports scanning a network with nmap.
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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.nmap_scanner/
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"""
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import logging
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import re
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import subprocess
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from collections import namedtuple
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from datetime import timedelta
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import homeassistant.util.dt as dt_util
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from homeassistant.components.device_tracker import DOMAIN
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from homeassistant.const import CONF_HOSTS
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from homeassistant.helpers import validate_config
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from homeassistant.util import Throttle, convert
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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=5)
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_LOGGER = logging.getLogger(__name__)
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# interval in minutes to exclude devices from a scan while they are home
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CONF_HOME_INTERVAL = "home_interval"
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REQUIREMENTS = ['python-nmap==0.4.3']
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def get_scanner(hass, config):
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""" Validates config and returns a Nmap scanner. """
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if not validate_config(config, {DOMAIN: [CONF_HOSTS]},
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_LOGGER):
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return None
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scanner = NmapDeviceScanner(config[DOMAIN])
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return scanner if scanner.success_init else None
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Device = namedtuple("Device", ["mac", "name", "ip", "last_update"])
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def _arp(ip_address):
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""" Get the MAC address for a given IP. """
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cmd = ['arp', '-n', ip_address]
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arp = subprocess.Popen(cmd, stdout=subprocess.PIPE)
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out, _ = arp.communicate()
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match = re.search(r'(([0-9A-Fa-f]{1,2}\:){5}[0-9A-Fa-f]{1,2})', str(out))
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if match:
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return match.group(0)
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_LOGGER.info("No MAC address found for %s", ip_address)
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return None
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class NmapDeviceScanner(object):
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""" This class scans for devices using nmap. """
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def __init__(self, config):
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self.last_results = []
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self.hosts = config[CONF_HOSTS]
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minutes = convert(config.get(CONF_HOME_INTERVAL), int, 0)
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self.home_interval = timedelta(minutes=minutes)
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self.success_init = self._update_info()
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_LOGGER.info("nmap scanner initialized")
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def scan_devices(self):
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"""
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Scans for new devices and return a list containing found device ids.
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"""
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self._update_info()
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return [device.mac for device in self.last_results]
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def get_device_name(self, mac):
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""" Returns the name of the given device or None if we don't know. """
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filter_named = [device.name for device in self.last_results
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if device.mac == mac]
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if filter_named:
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return filter_named[0]
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else:
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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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"""
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Scans the network for devices.
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Returns boolean if scanning successful.
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"""
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_LOGGER.info("Scanning")
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from nmap import PortScanner, PortScannerError
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scanner = PortScanner()
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options = "-F --host-timeout 5s"
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if self.home_interval:
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boundary = dt_util.now() - self.home_interval
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last_results = [device for device in self.last_results
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if device.last_update > boundary]
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if last_results:
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# Pylint is confused here.
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# pylint: disable=no-member
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options += " --exclude {}".format(",".join(device.ip for device
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in last_results))
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else:
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last_results = []
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try:
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result = scanner.scan(hosts=self.hosts, arguments=options)
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except PortScannerError:
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return False
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now = dt_util.now()
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for ipv4, info in result['scan'].items():
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if info['status']['state'] != 'up':
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continue
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name = info['hostnames'][0]['name'] if info['hostnames'] else ipv4
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# Mac address only returned if nmap ran as root
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mac = info['addresses'].get('mac') or _arp(ipv4)
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if mac is None:
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continue
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last_results.append(Device(mac.upper(), name, ipv4, now))
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self.last_results = last_results
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_LOGGER.info("nmap scan successful")
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return True
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