public async Task SendingAndReceiving()
{
var transationId = StunTransactionId.Generate();
var mappedAddresses = new List <IPEndPoint>();
var datagramBlock = new DatagramBlock(new DatagramOptions
{
ListeningPoint = new IPEndPoint(IPAddress.Any, 50000)
});
var stunMessage = new StunBuilderStep().SetType(StunMessageType.BindingRequest)
.SetTransactionId(transationId)
.Build();
var datagram = new Datagram(stunMessage, new byte[] { 64, 233, 161, 127 }, 19302); //stun1.l.google.com:19302
var stunMessageHandler = new ActionBlock <StunMessage>(response =>
{
if (response.Type != StunMessageType.BindingResponse || response.TransactionId != transationId)
{
return;
}
foreach (var attribute in response.Attributes)
{
if (StunMappedAddressAttribute.TryParse(attribute, out var mappedAddressAttribute))
{
mappedAddresses.Add(new IPEndPoint(new IPAddress(mappedAddressAttribute.EndPoint.Address.ToArray()), mappedAddressAttribute.EndPoint.Port));
}
}
});
var stunMessagePipe = new StunPipeBlock();
datagramBlock.LinkTo(stunMessagePipe, new DataflowLinkOptions {
PropagateCompletion = true
});
stunMessagePipe.LinkTo(stunMessageHandler, new DataflowLinkOptions {
PropagateCompletion = true
});
stunMessagePipe.LinkTo(DataflowBlock.NullTarget <Datagram>());
using (new Timer(context => datagramBlock.Post(datagram), null, TimeSpan.FromSeconds(1), TimeSpan.FromSeconds(1)))
{
datagramBlock.Start();
await datagramBlock.Initialization;
await Task.Delay(4000);
datagramBlock.Complete();
await Task.WhenAll(datagramBlock.Completion,
stunMessagePipe.Completion,
stunMessageHandler.Completion);
}
mappedAddresses.Should().HaveCountGreaterOrEqualTo(3);
}
public static bool TryParse(StunAttribute attribute, out StunMappedAddressAttribute result)
{
result = new StunMappedAddressAttribute();
if (attribute.Type != StunAttributeType.MappedAddress)
{
return(false);
}
if (!StunIPEndPoint.TryParse(attribute.Content, out var stunEndPoint))
{
return(false);
}
result = new StunMappedAddressAttribute(stunEndPoint);
return(true);
}
