Someone was nice enough to writez the code, see https://searchcode.com/codesearch/view/7464800/
private static IPEndPoint QueryRoutingInterface(
Socket socket,
IPEndPoint remoteEndPoint)
{
SocketAddress address = remoteEndPoint.Serialize();
byte[] remoteAddrBytes = new byte[address.Size];
for (int i = 0; i < address.Size; i++) {
remoteAddrBytes[i] = address[i];
}
byte[] outBytes = new byte[remoteAddrBytes.Length];
socket.IOControl(
IOControlCode.RoutingInterfaceQuery,
remoteAddrBytes,
outBytes);
for (int i = 0; i < address.Size; i++) {
address[i] = outBytes[i];
}
EndPoint ep = remoteEndPoint.Create(address);
return (IPEndPoint)ep;
}
which is used like (example!):
IPAddress remoteIp = IPAddress.Parse("192.168.1.55");
IpEndPoint remoteEndPoint = new IPEndPoint(remoteIp, 0);
Socket socket = new Socket(
AddressFamily.InterNetwork,
SocketType.Dgram,
ProtocolType.Udp);
IPEndPoint localEndPoint = QueryRoutingInterface(socket, remoteEndPoint );
Console.WriteLine("Local EndPoint is: {0}", localEndPoint);
Please note that although one is specifying an IpEndPoint
with a Port, the port is irrelevant. Also, the returned IpEndPoint.Port
is always 0
.
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