ibc · June 9, 2020 10:12 · Jun 9, 2020
diff --git a/mediasoup-get-bindable-ip.ts b/mediasoup-get-bindable-ip.ts
@@ -0,0 +1,64 @@
+import * as os from 'os';
+import * as dgram from 'dgram';
+
+async function detectBindableIp(family: 'IPv4' | 'IPv6'): Promise<string> {
+  const ifaces = os.networkInterfaces();
+
+  // Iterate all network interfaces.
+  for (const iface of Object.keys(ifaces)) {
+    // Iterate all network addresses in each network interface.
+    for (const address of ifaces[iface]) {
+      // Ignore if family doesn't match.
+      if (address.family !== family) {
+        continue;
+      }
+
+      // Ignore if internal.
+      if (address.internal) {
+        continue;
+      }
+
+      const ip = address.address;
+
+      console.log(`detectBindableIp() | testing iface:${iface}, ip:${ip}`);
+
+      try {
+        await new Promise((resolve, reject) => {
+          // Verify we can bind into it.
+          const socketType = family === 'IPv4' ? 'udp4' : 'udp6';
+          const socket = dgram.createSocket({ type: socketType });
+
+          socket.on('error', error => {
+            socket.close();
+            reject(error);
+          });
+
+          try {
+            socket.bind({ port: 0, address: ip }, () => {
+              socket.close();
+              resolve();
+            });
+          } catch (error) {
+            socket.close();
+            reject(error);
+          }
+        });
+
+        // Resolve with this IP.
+        console.log(`detectBindableIp() | got bindable ${family}: ${ip}`);
+
+        return ip;
+      } catch (error) {
+        console.warn(
+          `detectBindableIp() | bind test failed for ${ip}: ${error}`,
+        );
+      }
+    }
+  }
+
+  // If we are here if means that we got no bindable IP for the requested
+  // family, so throw.
+  console.error(`detectBindableIp() | no bindable ${family} found`);
+
+  throw new Error(`no bindable ${family} found`);
+}