braviatv, nmap_tracker: use getmac for getting MAC addresses (#24628)

* braviatv, nmap_tracker: use getmac for getting MAC addresses

Refs https://github.com/home-assistant/home-assistant/pull/24601

* Move getmac imports to top level

homeassistant/components/nmap_tracker/device_tracker.py

@@ -1,10 +1,9 @@
 """Support for scanning a network with nmap."""
 import logging
-import re
-import subprocess
 from collections import namedtuple
 from datetime import timedelta
 
+from getmac import get_mac_address
 import voluptuous as vol
 
 import homeassistant.helpers.config_validation as cv
@@ -40,18 +39,6 @@ def get_scanner(hass, config):
 Device = namedtuple('Device', ['mac', 'name', 'ip', 'last_update'])
 
 
-def _arp(ip_address):
-    """Get the MAC address for a given IP."""
-    cmd = ['arp', '-n', ip_address]
-    arp = subprocess.Popen(cmd, stdout=subprocess.PIPE)
-    out, _ = arp.communicate()
-    match = re.search(r'(([0-9A-Fa-f]{1,2}\:){5}[0-9A-Fa-f]{1,2})', str(out))
-    if match:
-        return ':'.join([i.zfill(2) for i in match.group(0).split(':')])
-    _LOGGER.info('No MAC address found for %s', ip_address)
-    return None
-
-
 class NmapDeviceScanner(DeviceScanner):
     """This class scans for devices using nmap."""
 
@@ -132,8 +119,9 @@ class NmapDeviceScanner(DeviceScanner):
                 continue
             name = info['hostnames'][0]['name'] if info['hostnames'] else ipv4
             # Mac address only returned if nmap ran as root
-            mac = info['addresses'].get('mac') or _arp(ipv4)
+            mac = info['addresses'].get('mac') or get_mac_address(ip=ipv4)
             if mac is None:
+                _LOGGER.info('No MAC address found for %s', ipv4)
                 continue
             last_results.append(Device(mac.upper(), name, ipv4, now))