allow callback to handle returned IP addresses (e.g. to add to firewall)

dnsrewriteproxy.py

@@ -57,12 +57,15 @@ def get_resolver_logger_adapter_default(parent_adapter):
         return ResolverLoggerAdapter(parent_adapter, dns_extra)
     return _get_resolver_logger_adapter_default
 
+async def process_addresses_default(addresses):
+	return
 
 def DnsProxy(
         get_resolver=get_resolver_default,
         get_logger_adapter=get_logger_adapter_default,
         get_resolver_logger_adapter=get_resolver_logger_adapter_default,
         get_socket=get_socket_default, num_workers=1000,
+        process_addresses=process_addresses_default,
         rules=(),
 ):
 
@@ -178,6 +181,7 @@ def DnsProxy(
             return error(query, dns_response_code_error.args[0])
 
         request_logger.info('Resolved to %s', ip_addresses)
+        await process_addresses(ip_addresses)
         now = loop.time()
 
         def ttl(ip_address):