Merge pull request #183 from immutable/feat/volstro-webview-multiple-instances

[DX-2771] feat: check for available ports when setting up uwb tcp

Author: nattb8

src/Packages/Passport/Runtime/ThirdParty/UnityWebBrowser/Runtime/Communication/TCPCommunicationLayer.cs

@@ -6,6 +6,7 @@
 // This project is under the MIT license. See the LICENSE.md file for more details.
 
 using System.Net;
+using System.Net.NetworkInformation;
 using UnityEngine;
 using VoltRpc.Communication;
 using VoltRpc.Communication.TCP;
@@ -32,6 +33,18 @@ public sealed class TCPCommunicationLayer : CommunicationLayer
         [Tooltip("The out port to communicate on")]
         public int outPort = 5556;
 
+        public TCPCommunicationLayer()
+        {
+            // If ports are not available, use different ports
+            System.Random rnd = new System.Random();
+            while (!CheckAvailableServerPort(inPort) || !CheckAvailableServerPort(outPort))
+            {
+                int port = rnd.Next(1024, 65353);
+                inPort = port;
+                outPort = port + 1;
+            }
+        }
+
         public override Client CreateClient()
         {
             IPEndPoint ipEndPoint = new(IPAddress.Loopback, inPort);
@@ -50,6 +63,25 @@ public override void GetIpcSettings(out object outLocation, out object inLocatio
             inLocation = inPort;
             assemblyLocation = null;
         }
+
+        private bool CheckAvailableServerPort(int port) {
+            Debug.Log($"Checking Port {port}");
+            bool isAvailable = true;
+
+            IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();
+            IPEndPoint[] tcpConnInfoArray = ipGlobalProperties.GetActiveTcpListeners();
+
+            foreach (IPEndPoint endpoint in tcpConnInfoArray) {
+                if (endpoint.Port == port) {
+                    isAvailable = false;
+                    break;
+                }
+            }
+
+            Debug.Log($"Port {port} available = {isAvailable}");
+
+            return isAvailable;
+        }
     }
 }