improve default route service to detect connected routers and use the addresses of the first one found

daemon/core/configservices/utilservices/services.py

@@ -1,10 +1,10 @@
-import logging
 from typing import Any, Dict
 
 import netaddr
 
 from core import utils
 from core.configservice.base import ConfigService, ConfigServiceMode
+from core.nodes.base import CoreNode
 
 GROUP_NAME = "Utility"
 
@@ -24,16 +24,21 @@ class DefaultRouteService(ConfigService):
     modes = {}
 
     def data(self) -> Dict[str, Any]:
-        addresses = []
-        for netif in self.node.netifs():
-            if getattr(netif, "control", False):
+        # only add default routes for linked routing nodes
+        routes = []
+        for other_node in self.node.session.nodes.values():
+            if not isinstance(other_node, CoreNode):
                 continue
-            for addr in netif.addrlist:
-                logging.info("default route address: %s", addr)
-                net = netaddr.IPNetwork(addr)
-                if net[1] != net[-2]:
-                    addresses.append(net[1])
-        return dict(addresses=addresses)
+            if other_node.type not in ["router", "mdr"]:
+                continue
+            commonnets = self.node.commonnets(other_node)
+            if commonnets:
+                _, _, router_eth = commonnets[0]
+                for x in router_eth.addrlist:
+                    addr, prefix = x.split("/")
+                    routes.append(addr)
+                break
+        return dict(routes=routes)
 
 
 class DefaultMulticastRouteService(ConfigService):