private void StunRequest(EndPoint stunEndPoint, StunPacket packet, Action <StunPacket> callback)
{
bool hasresponded = false;
Action <EndPoint, byte[]> action = null;
//---------------------------------------
// the stun response handler.
//---------------------------------------
action = new Action <EndPoint, byte[]>((endpoint, data) => {
//---------------------------------------------
// here, we try and catch any parse errors, which
// may originate from other things attempting to
// send data to this socket.
//---------------------------------------------
try {
StunPacket response = new StunPacket();
response.Parse(data);
this.OnMessage -= action;
hasresponded = true;
callback(response);
}
catch {
}
});
//---------------------------------------
// setup timeout in case of no response.
//---------------------------------------
Reactor.Timeout.Create(() => {
if (!hasresponded)
{
this.OnMessage -= action;
callback(null);
}
}, 2000);
//---------------------------------------
// set on response, make request.
//---------------------------------------
this.OnMessage += action;
this.Send(stunEndPoint, packet.ToByteData());
}
private void StunRequest(EndPoint stunEndPoint, StunPacket packet, Action<StunPacket> callback)
{
bool hasresponded = false;
Action<EndPoint, byte[]> action = null;
//---------------------------------------
// the stun response handler.
//---------------------------------------
action = new Action<EndPoint, byte[]>((endpoint, data) => {
//---------------------------------------------
// here, we try and catch any parse errors, which
// may originate from other things attempting to
// send data to this socket.
//---------------------------------------------
try {
StunPacket response = new StunPacket();
response.Parse(data);
this.OnMessage -= action;
hasresponded = true;
callback(response);
}
catch {
}
});
//---------------------------------------
// setup timeout in case of no response.
//---------------------------------------
Reactor.Timeout.Create(() => {
if (!hasresponded) {
this.OnMessage -= action;
callback(null);
}
}, 2000);
//---------------------------------------
// set on response, make request.
//---------------------------------------
this.OnMessage += action;
this.Send(stunEndPoint, packet.ToByteData());
}
/// <summary>
/// Pings a stun server and obtains a limited time public ip and port for this UDP socket.
/// </summary>
/// <param name="Host">The IP address of the Stun Server.</param>
/// <param name="Port">The port of the Stun Server.</param>
/// <param name="callback">A callback with the Stun response.</param>
public void Stun(string Host, int Port, Action <Exception, StunResponse> callback)
{
//----------------------------------------------------------------
// save any events on this socket.
//----------------------------------------------------------------
var actions = new List <Action <EndPoint, byte[]> >();
if (this.OnMessage != null)
{
foreach (var _action in this.OnMessage.GetInvocationList())
{
var action = (Action <EndPoint, byte[]>)_action;
actions.Add(action);
this.OnMessage -= action;
}
}
//----------------------------------------------------------------
// resolve stun endpoint.
//----------------------------------------------------------------
Reactor.Net.Dns.GetHostAddresses(Host, (exception0, addresses) => {
if (exception0 != null)
{
callback(exception0, null);
return;
}
var remoteEP = new IPEndPoint(addresses[0], Port);
StunPacket test1 = new StunPacket();
test1.Type = PacketType.BindingRequest;
this.StunRequest(remoteEP, test1, (test1response) =>
{
if (test1response == null)
{
foreach (var action in actions)
{
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.UdpBlocked, null));
}
else
{
if (this.LocalEndPoint.Equals(test1response.MappedAddress))
{
StunPacket test2 = new StunPacket();
test2.Type = PacketType.BindingRequest;
test2.ChangeRequest = new ChangeRequest(true, true);
this.StunRequest(remoteEP, test2, (test2response) =>
{
if (test2response == null)
{
foreach (var action in actions)
{
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.SymmetricUdpFirewall, test1response.MappedAddress));
}
else
{
foreach (var action in actions)
{
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.OpenInternet, test1response.MappedAddress));
}
});
}
else
{
StunPacket test2 = new StunPacket();
test2.Type = PacketType.BindingRequest;
test2.ChangeRequest = new ChangeRequest(true, true);
this.StunRequest(remoteEP, test2, (test2response) =>
{
if (test2response != null)
{
foreach (var action in actions)
{
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.FullCone, test1response.MappedAddress));
}
else
{
// Test I(II)
StunPacket test12 = new StunPacket();
test12.Type = PacketType.BindingRequest;
this.StunRequest(remoteEP, test12, (test12response) =>
{
if (test12response == null)
{
foreach (var action in actions)
{
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.UdpBlocked, null));
}
else
{
StunPacket test3 = new StunPacket();
test3.Type = PacketType.BindingRequest;
test3.ChangeRequest = new ChangeRequest(false, true);
this.StunRequest(remoteEP, test3, (test3response) =>
{
if (test3response == null)
{
foreach (var action in actions)
{
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.PortRestrictedCone, test1response.MappedAddress));
}
else
{
foreach (var action in actions)
{
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.RestrictedCone, test1response.MappedAddress));
}
});
}
});
}
});
}
}
});
});
}
/// <summary>
/// Pings a stun server and obtains a limited time public ip and port for this UDP socket.
/// </summary>
/// <param name="Host">The IP address of the Stun Server.</param>
/// <param name="Port">The port of the Stun Server.</param>
/// <param name="callback">A callback with the Stun response.</param>
public void Stun(string Host, int Port, Action<Exception, StunResponse> callback)
{
//----------------------------------------------------------------
// save any events on this socket.
//----------------------------------------------------------------
var actions = new List<Action<EndPoint, byte[]>>();
if(this.OnMessage != null) {
foreach(var _action in this.OnMessage.GetInvocationList()) {
var action = (Action<EndPoint, byte[]>)_action;
actions.Add(action);
this.OnMessage -= action;
}
}
//----------------------------------------------------------------
// resolve stun endpoint.
//----------------------------------------------------------------
Reactor.Net.Dns.GetHostAddresses(Host, (exception0, addresses) => {
if (exception0 != null)
{
callback(exception0, null);
return;
}
var remoteEP = new IPEndPoint(addresses[0], Port);
StunPacket test1 = new StunPacket();
test1.Type = PacketType.BindingRequest;
this.StunRequest(remoteEP, test1, (test1response) =>
{
if (test1response == null)
{
foreach(var action in actions) {
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.UdpBlocked, null));
}
else
{
if (this.LocalEndPoint.Equals(test1response.MappedAddress))
{
StunPacket test2 = new StunPacket();
test2.Type = PacketType.BindingRequest;
test2.ChangeRequest = new ChangeRequest(true, true);
this.StunRequest(remoteEP, test2, (test2response) =>
{
if (test2response == null)
{
foreach(var action in actions) {
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.SymmetricUdpFirewall, test1response.MappedAddress));
}
else
{
foreach(var action in actions) {
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.OpenInternet, test1response.MappedAddress));
}
});
}
else
{
StunPacket test2 = new StunPacket();
test2.Type = PacketType.BindingRequest;
test2.ChangeRequest = new ChangeRequest(true, true);
this.StunRequest(remoteEP, test2, (test2response) =>
{
if (test2response != null)
{
foreach(var action in actions) {
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.FullCone, test1response.MappedAddress));
}
else
{
// Test I(II)
StunPacket test12 = new StunPacket();
test12.Type = PacketType.BindingRequest;
this.StunRequest(remoteEP, test12, (test12response) =>
{
if (test12response == null)
{
foreach(var action in actions) {
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.UdpBlocked, null));
}
else
{
StunPacket test3 = new StunPacket();
test3.Type = PacketType.BindingRequest;
test3.ChangeRequest = new ChangeRequest(false, true);
this.StunRequest(remoteEP, test3, (test3response) =>
{
if (test3response == null)
{
foreach(var action in actions) {
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.PortRestrictedCone, test1response.MappedAddress));
}
else
{
foreach(var action in actions) {
this.OnMessage += action;
}
callback(null, new StunResponse(NatType.RestrictedCone, test1response.MappedAddress));
}
});
}
});
}
});
}
}
});
});
}