/// <summary>
/// Re initializes the socket
/// </summary>
/// <param name="socket">The socket which should be reinitialized</param>
private void Renew(UdpClient socket)
{
UdpClient newsocket = null;
if (socket is UdpClientMulticast mcastSocket)
{
newsocket = new UdpClientMulticast(mcastSocket.Address, mcastSocket.MulticastAddress, mcastSocket.Port);
}
else if (socket is UdpClientBroadcast bcastSocket)
{
newsocket = new UdpClientBroadcast(bcastSocket.Address, bcastSocket.Port, bcastSocket.PubSubContext);
}
else if (socket is UdpClientUnicast ucastSocket)
{
newsocket = new UdpClientUnicast(ucastSocket.Address, ucastSocket.Port);
}
m_subscriberUdpClients.Remove(socket);
m_subscriberUdpClients.Add(newsocket);
socket.Close();
socket.Dispose();
newsocket.BeginReceive(new AsyncCallback(OnUadpReceive), newsocket);
}
/// <summary>
/// Create specific <see cref="UdpClient"/> for specified <see cref="NetworkInterface"/> and <see cref="IPEndPoint"/>.
/// </summary>
/// <param name="pubSubContext">Is the method called in a publisher context or a subscriber context</param>
/// <param name="networkInterface"></param>
/// <param name="configuredEndpoint"></param>
/// <returns></returns>
private static UdpClient CreateUdpClientForNetworkInterface(UsedInContext pubSubContext, NetworkInterface networkInterface, IPEndPoint configuredEndpoint)
{
UdpClient udpClient = null;
IPInterfaceProperties ipProps = networkInterface.GetIPProperties();
IPAddress localAddress = IPAddress.Any;
foreach (var address in ipProps.UnicastAddresses)
{
if (address.Address.AddressFamily == AddressFamily.InterNetwork)
{
localAddress = address.Address;
}
}
try
{
//detect the port used for binding
int port = 0;
if (pubSubContext == UsedInContext.Subscriber)
{
port = configuredEndpoint.Port;
}
if (IsIPv4MulticastAddress(configuredEndpoint.Address))
{
//instantiate multi-cast UdpClient
udpClient = new UdpClientMulticast(localAddress, configuredEndpoint.Address, port);
}
else if (IsIPv4BroadcastAddress(configuredEndpoint.Address, networkInterface))
{
//instantiate broadcast UdpClient depending on publisher/subscriber usage context
udpClient = new UdpClientBroadcast(localAddress, port, pubSubContext);
}
else
{
//instantiate unicast UdpClient depending on publisher/subscriber usage context
udpClient = new UdpClientUnicast(localAddress, port);
}
if (pubSubContext == UsedInContext.Publisher)
{
//try to send 1 byte for target IP
udpClient.Send(new byte[] { 0 }, 1, configuredEndpoint);
}
// On Windows Only since Linux does not support this
if (!RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
{
// Disable exceptions raised by ICMP Port Unreachable messages
udpClient.Client.IOControl((IOControlCode)SIO_UDP_CONNRESET, new byte[] { 0, 0, 0, 0 }, null);
}
}
catch (Exception ex)
{
Utils.Trace(Utils.TraceMasks.Information, "Cannot use Network interface '{0}'. Exception: {1}",
networkInterface.Name, ex.Message);
if (udpClient != null)
{
//cleanup
udpClient.Dispose();
udpClient = null;
}
}
return(udpClient);
}
