route-update.sh: detect lost routes/rules on hash-mismatch path

router/route-update.sh

@@ -322,6 +322,16 @@ process_routes()
             vlog "[$name]$label state: force=$FORCE resolve=$RESOLVE hash_exists=$([ -f "$STATE_DIR/$state/hash" ] && echo yes || echo no)"
         fi
 
+        # Detect routes/rules lost even when hash changed (e.g. DNS availability)
+        if [ -z "$FORCE" ] && [ -z "$need_reload" ] ; then
+            local cur_rules=$($ipcmd -N rule show | grep -c "lookup $table")
+            local cur_routes=$($ipcmd route show table "$table" 2>/dev/null | grep -c '^[^[:space:]]')
+            if [ "$cur_rules" = "0" ] || [ "$cur_routes" = "0" ] ; then
+                need_reload=1
+                log "[$name]$label Rules/routes lost, forcing reload"
+            fi
+        fi
+
         # Skip re-resolve if only gateway/options changed (lists unchanged)
         local resolved_new="$STATE_DIR/$state/resolved.new"
         if [ -z "$FORCE" ] && [ -z "$RESOLVE" ] && [ -f "$STATE_DIR/$state/lists_hash" ] && [ -f "$STATE_DIR/$state/resolved" ] ; then