private void OnPacketReceived(UdpReceiver receiver, int localPort, IPEndPoint remoteEndPoint, byte[] packet)
{
STUNMessage stunMessage = STUNMessage.ParseSTUNMessage(packet, packet.Length);
switch (stunMessage.Header.MessageType)
{
case STUNMessageTypesEnum.Allocate:
logger.LogDebug($"MockTurnServer received Allocate request from {remoteEndPoint}.");
if (_relaySocket == null)
{
_clientEndPoint = remoteEndPoint;
// Create a new relay socket.
NetServices.CreateRtpSocket(false, _listenAddress, 0, out _relaySocket, out _);
_relayEndPoint = _relaySocket.LocalEndPoint as IPEndPoint;
logger.LogDebug($"MockTurnServer created relay socket on {_relayEndPoint}.");
_relayListener = new UdpReceiver(_relaySocket);
_relayListener.OnPacketReceived += OnRelayPacketReceived;
_relayListener.OnClosed += (reason) => logger.LogDebug($"MockTurnServer relay on {_relayEndPoint} closed.");
_relayListener.BeginReceiveFrom();
}
STUNMessage allocateResponse = new STUNMessage(STUNMessageTypesEnum.AllocateSuccessResponse);
allocateResponse.Header.TransactionId = stunMessage.Header.TransactionId;
allocateResponse.AddXORMappedAddressAttribute(remoteEndPoint.Address, remoteEndPoint.Port);
allocateResponse.AddXORAddressAttribute(STUNAttributeTypesEnum.XORRelayedAddress, _relayEndPoint.Address, _relayEndPoint.Port);
_clientSocket.SendTo(allocateResponse.ToByteBuffer(null, false), remoteEndPoint);
break;
case STUNMessageTypesEnum.BindingRequest:
logger.LogDebug($"MockTurnServer received Binding request from {remoteEndPoint}.");
STUNMessage stunResponse = new STUNMessage(STUNMessageTypesEnum.BindingSuccessResponse);
stunResponse.Header.TransactionId = stunMessage.Header.TransactionId;
stunResponse.AddXORMappedAddressAttribute(remoteEndPoint.Address, remoteEndPoint.Port);
_clientSocket.SendTo(stunResponse.ToByteBuffer(null, false), remoteEndPoint);
break;
case STUNMessageTypesEnum.CreatePermission:
logger.LogDebug($"MockTurnServer received CreatePermission request from {remoteEndPoint}.");
STUNMessage permResponse = new STUNMessage(STUNMessageTypesEnum.CreatePermissionSuccessResponse);
permResponse.Header.TransactionId = stunMessage.Header.TransactionId;
_clientSocket.SendTo(permResponse.ToByteBuffer(null, false), remoteEndPoint);
break;
case STUNMessageTypesEnum.SendIndication:
logger.LogDebug($"MockTurnServer received SendIndication request from {remoteEndPoint}.");
var buffer = stunMessage.Attributes.Single(x => x.AttributeType == STUNAttributeTypesEnum.Data).Value;
var destEP = (stunMessage.Attributes.Single(x => x.AttributeType == STUNAttributeTypesEnum.XORPeerAddress) as STUNXORAddressAttribute).GetIPEndPoint();
logger.LogDebug($"MockTurnServer relaying {buffer.Length} bytes to {destEP}.");
_relaySocket.SendTo(buffer, destEP);
break;
default:
logger.LogDebug($"MockTurnServer received unknown STUN message from {remoteEndPoint}.");
break;
}
}
private void ListenForXMPPServerMedia(UdpClient localSocket)
{
try
{
logger.Debug("Commencing listen for media from XMPP server on local socket " + m_localSIPEndPoint + ".");
bool stunResponseSent = false;
IPEndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, 0);
byte[] buffer = localSocket.Receive(ref remoteEndPoint);
while (buffer != null && buffer.Length > 0 && !m_exit)
{
//if (!stunResponseSent && buffer[0] >> 0xef == 0)
if (!stunResponseSent)
{
//logger.Debug(buffer.Length + " bytes read on media socket from " + remoteEndPoint.ToString() + ", byte[0]=" + buffer[0].ToString() + ".");
STUNMessage stunMessage = STUNMessage.ParseSTUNMessage(buffer, buffer.Length);
logger.Debug("STUN message received " + stunMessage.Header.MessageType + ".");
if (stunMessage.Header.MessageType == STUNMessageTypesEnum.BindingRequest)
{
logger.Debug("Sending STUN response to " + remoteEndPoint + ".");
stunResponseSent = true;
STUNMessage stunResponse = new STUNMessage();
stunResponse.Header.MessageType = STUNMessageTypesEnum.BindingResponse;
stunResponse.Header.TransactionId = stunMessage.Header.TransactionId;
stunResponse.AddUsernameAttribute(Encoding.UTF8.GetString(stunMessage.Attributes[0].Value));
byte[] stunRespBytes = stunResponse.ToByteBuffer();
m_xmppMediaSocket.Send(stunRespBytes, stunRespBytes.Length, remoteEndPoint);
}
else
{
//if (stunMessage.Attributes.Count > 0)
//{
// foreach (STUNAttribute stunAttribute in stunMessage.Attributes)
// {
// Console.WriteLine(" " + stunAttribute.AttributeType + "=" + stunAttribute.Value + ".");
// }
//}
}
}
if (buffer.Length > 100)
{
m_sipMediaSocket.Send(buffer, buffer.Length, m_sipPhoneRTPEndPoint);
}
buffer = localSocket.Receive(ref remoteEndPoint);
}
}
catch (SocketException)
{ }
catch (Exception excp)
{
logger.Error("Exception ListenForXMPPServerMedia. " + excp.Message);
}
finally
{
logger.Debug("Shutting down listen for SIP phone media on local socket " + m_localSIPEndPoint + ".");
}
}