detect loopback and coturn option

src/apps/cli/testdeno/helpers/docker.ts

@@ -625,7 +625,7 @@ export async function startP2pRelay(): Promise<void> {
 }
 
 export function isLocalP2pRelay(relayUrl: string): boolean {
-    return relayUrl === "ws://localhost:4000" || relayUrl === "ws://localhost:4000/";
+    return relayUrl.includes("localhost") || relayUrl.includes("127.0.0.1") || relayUrl.includes("[::1]");
 }
 
 // ---------------------------------------------------------------------------
@@ -648,7 +648,10 @@ export async function startCoturn(
     console.log("[INFO] stopping leftover Coturn container if present");
     await stopCoturn().catch(() => {});
 
-    console.log("[INFO] starting local Coturn container");
+    const { getOptimalLoopbackIp } = await import("./net.ts");
+    const externalIp = await getOptimalLoopbackIp();
+
+    console.log(`[INFO] starting local Coturn container with external-ip ${externalIp}`);
     await dockerOrFail(
         "run",
         "-d",
@@ -660,7 +663,7 @@ export async function startCoturn(
         `${port}:${port}/udp`,
         COTURN_IMAGE,
         "--log-file=stdout",
-        "--external-ip=127.0.0.1",
+        `--external-ip=${externalIp}`,
         `--user=${user}:${pass}`,
         `--realm=${realm}`
     );

src/apps/cli/testdeno/helpers/net.ts

@@ -47,3 +47,22 @@ export async function waitForPort(hostname: string, port: number, options: WaitF
             (lastError ? ` (last error: ${String(lastError)})` : "")
     );
 }
+
+export async function getOptimalLoopbackIp(): Promise<string> {
+    const ipv4 = "127.0.0.1";
+    const ipv6 = "::1";
+
+    try {
+        const l = Deno.listen({ hostname: ipv4, port: 0 });
+        l.close();
+        return ipv4;
+    } catch {
+        try {
+            const l = Deno.listen({ hostname: ipv6, port: 0 });
+            l.close();
+            return ipv6;
+        } catch {
+            return ipv4; // fallback to default
+        }
+    }
+}

src/apps/cli/testdeno/helpers/p2p.ts

@@ -97,7 +97,7 @@ export async function stopLocalRelayIfStarted(started: boolean): Promise<void> {
 }
 
 export async function maybeStartCoturn(turnServers: string): Promise<boolean> {
-    if (turnServers.includes("localhost") || turnServers.includes("127.0.0.1")) {
+    if (turnServers.includes("localhost") || turnServers.includes("127.0.0.1") || turnServers.includes("[::1]")) {
         await startCoturn();
         return true;
     }