SocketFactory: Remove redundant code

ExclusiveAddressUse should be false by default afaik

Emby.Server.Implementations/Net/SocketFactory.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 using System;
@@ -63,18 +61,13 @@ namespace Emby.Server.Implementations.Net
         }
 
         /// <inheritdoc />
-        public ISocket CreateUdpMulticastSocket(string ipAddress, int multicastTimeToLive, int localPort)
+        public ISocket CreateUdpMulticastSocket(IPAddress ipAddress, int multicastTimeToLive, int localPort)
         {
             if (ipAddress == null)
             {
                 throw new ArgumentNullException(nameof(ipAddress));
             }
 
-            if (ipAddress.Length == 0)
-            {
-                throw new ArgumentException("ipAddress cannot be an empty string.", nameof(ipAddress));
-            }
-
             if (multicastTimeToLive <= 0)
             {
                 throw new ArgumentException("multicastTimeToLive cannot be zero or less.", nameof(multicastTimeToLive));
@@ -87,15 +80,6 @@ namespace Emby.Server.Implementations.Net
 
             var retVal = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
 
-            try
-            {
-                // not supported on all platforms. throws on ubuntu with .net core 2.0
-                retVal.ExclusiveAddressUse = false;
-            }
-            catch (SocketException)
-            {
-            }
-
             try
             {
                 // seeing occasional exceptions thrown on qnap
@@ -114,7 +98,7 @@ namespace Emby.Server.Implementations.Net
 
                 var localIp = IPAddress.Any;
 
-                retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse(ipAddress), localIp));
+                retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(ipAddress, localIp));
                 retVal.MulticastLoopback = true;
 
                 return new UdpSocket(retVal, localPort, localIp);

MediaBrowser.Model/Net/ISocketFactory.cs

@@ -26,6 +26,6 @@ namespace MediaBrowser.Model.Net
         /// <param name="multicastTimeToLive">The multicast time to live value. Actually a maximum number of network hops for UDP packets.</param>
         /// <param name="localPort">The local port to bind to.</param>
         /// <returns>A <see cref="ISocket"/> implementation.</returns>
-        ISocket CreateUdpMulticastSocket(string ipAddress, int multicastTimeToLive, int localPort);
+        ISocket CreateUdpMulticastSocket(IPAddress ipAddress, int multicastTimeToLive, int localPort);
     }
 }

RSSDP/SsdpCommunicationsServer.cs

@@ -338,7 +338,7 @@ namespace Rssdp.Infrastructure
 
         private ISocket ListenForBroadcastsAsync()
         {
-            var socket = _SocketFactory.CreateUdpMulticastSocket(SsdpConstants.MulticastLocalAdminAddress, _MulticastTtl, SsdpConstants.MulticastPort);
+            var socket = _SocketFactory.CreateUdpMulticastSocket(IPAddress.Parse(SsdpConstants.MulticastLocalAdminAddress), _MulticastTtl, SsdpConstants.MulticastPort);
             _ = ListenToSocketInternal(socket);
 
             return socket;