Get device mac addresses

snap.py

@@ -2,7 +2,7 @@ from zeroconf import ServiceBrowser, Zeroconf
 import snapcast.control
 import asyncio
 import ipaddress
-# import netifaces
+import netifaces
 
 
 class Scanner:
@@ -43,11 +43,31 @@ def get_snapcast_server():
 
 
 def get_mac_addresses():
-    pass
+    '''Get list of all IPv4 MAC addresses for this device.'''
+    def contains_loopback(af_inet_addresses):
+        '''Check if list of IPv4 addresses contains loopback.'''
+        for ip in af_inet_addresses:
+            if ipaddress.IPv4Address(ip['addr']).is_loopback:
+                return True
+        return False
+
+    mac_addresses = []
+    for interface in netifaces.interfaces():
+        addresses = netifaces.ifaddresses(interface)
+        # Skip interfaces without an IPv4 address
+        if netifaces.AF_INET not in addresses:
+            continue
+        if contains_loopback(addresses[netifaces.AF_INET]):
+            continue
+        for mac in addresses[netifaces.AF_LINK]:
+            # Add to list if address has 'addr' key
+            if mac['addr']:
+                mac_addresses.append(mac['addr'])
+    return mac_addresses
 
 
 def get_snapcast_client(server):
-    '''scan through list of clients to find correct one'''
+    '''Scan through list of clients to find correct one.'''
     for client in server.clients:
         print(client.name)
         print(client.identifier)