Detect if port is already used

[devomage]

Is there a built in way to test if another application is using the port set (UDP and/or TCP) when starting a server?

if (TNServerInstance.isActive) of course will not work if the port is being used by another application...


Code I'm using:

1. using (TcpClient tcpClient = new TcpClient())
2. {
3.         try
4.         {
5.                 tcpClient.Connect(Tools.localAddress, serverTcpPort);
6.                 Debug.Log("Port open");
7.         }
8.         catch
9.         {
10.                 Debug.Log("Port closed");
11.         }
12. }
13.  

[TNet] Udp.Start: Only one usage of each socket address (protocol/network address/port) is normally permitted.

[devomage]

Ended up using the following code to detect:  network, internet and port

I'll try/catch when executing the server start function

Any optimization or feedback welcome...

1. //Note: For LAN use
2.  
3.  
4. using System.Linq;
5. using System.Net.Sockets;
6. using System.Runtime.InteropServices;
7. using TNet;
8. using UnityEngine;
9.  
10. //http://www.c-sharpcorner.com/uploadfile/nipuntomar/check-internet-connection/
11. public class InternetCS
12. {
13.     //Creating the extern function...
14.     [DllImport("wininet.dll")]
15.     private extern static bool InternetGetConnectedState(out int Description, int ReservedValue);
16.     //Creating a function that uses the API function...
17.     public static bool IsConnectedToInternet()
18.     {
19.         int Desc;
20.         return InternetGetConnectedState(out Desc, 0);
21.     }
22. }
23.  
24.  
25.  
26.  
27. public bool isNetworkAvailable
28. {
29.         get
30.         {
31.                 return System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable();
32.         }
33. }
34.  
35. public bool isInternetAvailable
36. {
37.         get
38.         {
39.                 return InternetCS.IsConnectedToInternet();
40.         }
41. }
42.  
43. public bool isPortAvailable
44. {
45.         get
46.         {
47.                 ServerList.Entry[] list = TNLobbyClient.knownServers.list.ToArray();
48.                
49.                 if (list.FirstOrDefault(i => i.internalAddress.Port == serverTcpPort) == null) return true;
50.                 else return false;
51.         }
52. }
53.  
54.  

[ArenMook]

wininet.dll, eh? Hope you aren't planning for this to work somewhere other than Windows

[devomage]

It was that or a Ping...  but, yeah - windows only.