141 lines
4.5 KiB
Python
141 lines
4.5 KiB
Python
""" Supports scanning using nmap. """
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import logging
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from datetime import timedelta, datetime
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from collections import namedtuple
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import subprocess
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import re
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from libnmap.process import NmapProcess
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from libnmap.parser import NmapParser, NmapParserException
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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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from homeassistant.components.device_tracker import DOMAIN
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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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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 ''
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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 = True
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self._update_info()
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_LOGGER.info("nmap scanner initialized")
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def scan_devices(self):
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""" Scans for new devices and return a
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list containing found device ids. """
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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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def _parse_results(self, stdout):
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""" Parses results from an nmap scan.
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Returns True if successful, False otherwise. """
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try:
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results = NmapParser.parse(stdout)
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now = datetime.now()
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self.last_results = []
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for host in results.hosts:
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if host.is_up():
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if host.hostnames:
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name = host.hostnames[0]
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else:
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name = host.ipv4
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if host.mac:
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mac = host.mac
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else:
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mac = _arp(host.ipv4)
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if mac:
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device = Device(mac, name, host.ipv4, now)
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self.last_results.append(device)
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_LOGGER.info("nmap scan successful")
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return True
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except NmapParserException as parse_exc:
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_LOGGER.error("failed to parse nmap results: %s", parse_exc.msg)
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self.last_results = []
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return False
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@Throttle(MIN_TIME_BETWEEN_SCANS)
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def _update_info(self):
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""" Scans the network for devices.
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Returns boolean if scanning successful. """
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if not self.success_init:
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return False
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_LOGGER.info("Scanning")
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options = "-F --host-timeout 5"
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exclude_targets = set()
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if self.home_interval:
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now = datetime.now()
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for host in self.last_results:
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if host.last_update + self.home_interval > now:
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exclude_targets.add(host)
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if len(exclude_targets) > 0:
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target_list = [t.ip for t in exclude_targets]
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options += " --exclude {}".format(",".join(target_list))
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nmap = NmapProcess(targets=self.hosts, options=options)
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nmap.run()
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if nmap.rc == 0:
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if self._parse_results(nmap.stdout):
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self.last_results.extend(exclude_targets)
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else:
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self.last_results = []
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_LOGGER.error(nmap.stderr)
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return False
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