public static IPAddress GetPublicIPAddress(string stunServer)
{
try
{
logger.Debug("STUNClient attempting to determine public IP from " + stunServer + ".");
using (UdpClient udpClient = new UdpClient(stunServer, m_defaultSTUNPort))
{
STUNMessage initMessage = new STUNMessage(STUNMessageTypesEnum.BindingRequest);
byte[] stunMessageBytes = initMessage.ToByteBuffer();
udpClient.Send(stunMessageBytes, stunMessageBytes.Length);
IPAddress publicIPAddress = null;
ManualResetEvent gotResponseMRE = new ManualResetEvent(false);
udpClient.BeginReceive((ar) =>
{
try
{
IPEndPoint stunResponseEndPoint = null;
byte[] stunResponseBuffer = udpClient.EndReceive(ar, ref stunResponseEndPoint);
if (stunResponseBuffer != null && stunResponseBuffer.Length > 0)
{
logger.Debug("STUNClient Response to initial STUN message received from " + stunResponseEndPoint + ".");
STUNMessage stunResponse = STUNMessage.ParseSTUNMessage(stunResponseBuffer, stunResponseBuffer.Length);
if (stunResponse.Attributes.Count > 0)
{
foreach (STUNAttribute stunAttribute in stunResponse.Attributes)
{
if (stunAttribute.AttributeType == STUNAttributeTypesEnum.MappedAddress)
{
publicIPAddress = ((STUNAddressAttribute)stunAttribute).Address;
logger.Debug("STUNClient Public IP=" + publicIPAddress.ToString() + ".");
}
}
}
}
gotResponseMRE.Set();
}
catch (Exception recvExcp)
{
logger.Warn("Exception STUNClient Receive. " + recvExcp.Message);
}
}, null);
if (gotResponseMRE.WaitOne(STUN_SERVER_RESPONSE_TIMEOUT * 1000))
{
return(publicIPAddress);
}
else
{
logger.Warn("STUNClient server response timedout after " + STUN_SERVER_RESPONSE_TIMEOUT + "s.");
return(null);
}
}
}
catch (Exception excp)
{
logger.Error("Exception STUNClient GetPublicIPAddress. " + excp.Message);
return(null);
//throw;
}
}
public void STUNPrimaryReceived(IPEndPoint localEndPoint, IPEndPoint receivedEndPoint, byte[] buffer, int bufferLength)
{
try
{
//Console.WriteLine("\n=> received from " + IPSocketAddress.GetSocketString(receivedEndPoint) + " on " + IPSocketAddress.GetSocketString(receivedOnEndPoint));
//Console.WriteLine(Utility.PrintBuffer(buffer));
STUNMessage stunRequest = STUNMessage.ParseSTUNMessage(buffer, bufferLength);
//Console.WriteLine(stunRequest.ToString());
FireSTUNPrimaryRequestInTraceEvent(localEndPoint, receivedEndPoint, stunRequest);
STUNMessage stunResponse = GetResponse(receivedEndPoint, stunRequest, true);
byte[] stunResponseBuffer = stunResponse.ToByteBuffer();
bool changeAddress = false;
bool changePort = false;
foreach (STUNAttribute attr in stunRequest.Attributes)
{
if (attr.AttributeType == STUNAttributeTypesEnum.ChangeRequest)
{
STUNChangeRequestAttribute changeReqAttr = (STUNChangeRequestAttribute)attr;
changeAddress = changeReqAttr.ChangeAddress;
changePort = changeReqAttr.ChangePort;
break;
}
}
if (!changeAddress)
{
if (!changePort)
{
//Console.WriteLine("<= sending to " + IPSocketAddress.GetSocketString(receivedEndPoint) + " from " + IPSocketAddress.GetSocketString(m_primaryEndPoint));
m_primarySend(receivedEndPoint, stunResponseBuffer);
FireSTUNPrimaryResponseOutTraceEvent(m_primaryEndPoint, receivedEndPoint, stunResponse);
}
else
{
//Console.WriteLine("<= sending to " + IPSocketAddress.GetSocketString(receivedEndPoint) + " from " + IPSocketAddress.GetSocketString(m_primaryDiffPortEndPoint));
m_primaryDiffPortSocket.Send(stunResponseBuffer, stunResponseBuffer.Length, receivedEndPoint);
FireSTUNPrimaryResponseOutTraceEvent(m_primaryDiffPortEndPoint, receivedEndPoint, stunResponse);
}
}
else
{
if (!changePort)
{
//Console.WriteLine("<= sending to " + IPSocketAddress.GetSocketString(receivedEndPoint) + " from " + IPSocketAddress.GetSocketString(m_secondaryEndPoint));
m_secondarySend(receivedEndPoint, stunResponseBuffer);
FireSTUNSecondaryResponseOutTraceEvent(m_secondaryEndPoint, receivedEndPoint, stunResponse);
}
else
{
//Console.WriteLine("<= sending to " + IPSocketAddress.GetSocketString(receivedEndPoint) + " from " + IPSocketAddress.GetSocketString(m_secondaryDiffPortEndPoint));
m_secondaryDiffPortSocket.Send(stunResponseBuffer, stunResponseBuffer.Length, receivedEndPoint);
FireSTUNSecondaryResponseOutTraceEvent(m_secondaryDiffPortEndPoint, receivedEndPoint, stunResponse);
}
}
}
catch (Exception excp)
{
logger.Debug("Exception STUNPrimaryReceived. " + excp.Message);
}
}
