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Set IOControl to disable ICMP unreachable messages #3

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Set IOControl to disable ICMP unreachable messages #3

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23 changes: 23 additions & 0 deletions CoreOSC/OscListener.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,29 @@ public class OscListener : IDisposable, IOscListener
public OscListener(IPEndPoint listenerEndPoint)
{
UdpClient = new UdpClient(listenerEndPoint);

// Set the SIO_UDP_CONNRESET ioctl to true for this UDP socket. If this UDP socket
// ever sends a UDP packet to a remote destination that exists but there is
// no socket to receive the packet, an ICMP port unreachable message is returned
// to the sender. By default, when this is received the next operation on the
// UDP socket that send the packet will receive a SocketException. The native
// (Winsock) error that is received is WSAECONNRESET (10054). Since we don't want
// to wrap each UDP socket operation in a try/except, we'll disable this error
// for the socket with this ioctl call.
try
{
uint IOC_IN = 0x80000000;
uint IOC_VENDOR = 0x18000000;
uint SIO_UDP_CONNRESET = IOC_IN | IOC_VENDOR | 12;

byte[] optionInValue = { Convert.ToByte(false) };
byte[] optionOutValue = new byte[4];
UdpClient.Client.IOControl((int)SIO_UDP_CONNRESET, optionInValue, optionOutValue);
}
catch
{
// Unable to set SIO_UDP_CONNRESET, maybe not supported
}
}

public async Task<OscMessage> ReceiveMessageAsync()
Expand Down