Send out of address space errors to sites and clients

server/routers/newt/error.ts

@@ -0,0 +1,24 @@
+import { sendToClient } from "#dynamic/routers/ws";
+
+// Error codes for registration failures
+export const NewtErrorCodes = {
+    NO_AVAILABLE_SUBNET: {
+        code: "NO_AVAILABLE_SUBNET",
+        message:
+            "No available subnet could be assigned to this site on its exit node. Please contact your administrator to increase the available address space for this exit node's subnet."
+    }
+} as const;
+
+// Helper function to send registration error
+export async function sendNewtError(
+    error: (typeof NewtErrorCodes)[keyof typeof NewtErrorCodes],
+    newtId: string
+) {
+    sendToClient(newtId, {
+        type: "newt/error",
+        data: {
+            code: error.code,
+            message: error.message
+        }
+    });
+}

server/routers/newt/handleNewtRegisterMessage.ts

@@ -14,6 +14,7 @@ import { getUniqueSubnetForExitNode } from "@server/lib/exitNodes";
 import { fetchContainers } from "./dockerSocket";
 import { buildTargetConfigurationForNewtClient } from "./buildConfiguration";
 import { canCompress } from "@server/lib/clientVersionChecks";
+import { NewtErrorCodes, sendNewtError } from "./error";
 
 export const handleNewtRegisterMessage: MessageHandler = async (context) => {
     const { message, client, sendToClient } = context;
@@ -116,6 +117,7 @@ export const handleNewtRegisterMessage: MessageHandler = async (context) => {
             logger.error(
                 `No available subnets found for the new exit node id ${exitNodeId} and site id ${siteId}`
             );
+            sendNewtError(NewtErrorCodes.NO_AVAILABLE_SUBNET, newt.newtId);
             return;
         }