/// <summary>
/// Does STUN transaction. Returns transaction response or null if transaction failed.
/// </summary>
/// <param name="request">STUN message.</param>
/// <param name="socket">Socket to use for send/receive.</param>
/// <param name="remoteEndPoint">Remote end point.</param>
/// <param name="timeout">Timeout in milli seconds.</param>
/// <returns>Returns transaction response or null if transaction failed.</returns>
private static STUN_Message DoTransaction(STUN_Message request,Socket socket,IPEndPoint remoteEndPoint,int timeout)
{
byte[] requestBytes = request.ToByteData();
DateTime startTime = DateTime.Now;
// Retransmit with 500 ms.
while(startTime.AddMilliseconds(timeout) > DateTime.Now){
try{
socket.SendTo(requestBytes,remoteEndPoint);
// We got response.
if(socket.Poll(500 * 1000,SelectMode.SelectRead)){
byte[] receiveBuffer = new byte[512];
socket.Receive(receiveBuffer);
// Parse message
STUN_Message response = new STUN_Message();
response.Parse(receiveBuffer);
// Check that transaction ID matches or not response what we want.
if(Net_Utils.CompareArray(request.TransactionID,response.TransactionID)){
return response;
}
}
}
catch{
}
}
return null;
}
public STUN_Message continueTransaction()
{
socket.SendTo(requestBytes, remoteEndPoint);
// We got response.
if (socket.Poll(100, SelectMode.SelectRead))
{
byte[] receiveBuffer = new byte[512];
socket.Receive(receiveBuffer);
// Parse message
STUN_Message response = new STUN_Message();
response.Parse(receiveBuffer);
// Check that transaction ID matches or not response what we want.
if (request.TransactionID.Equals(response.TransactionID))
{
return response;
}
}
return null;
}
/// <summary>
/// Does STUN transaction. Returns transaction response or null if transaction failed.
/// </summary>
/// <param name="request">STUN message.</param>
/// <param name="socket">Socket to use for send/receive.</param>
/// <param name="remoteEndPoint">Remote end point.</param>
/// <returns>Returns transaction response or null if transaction failed.</returns>
private static STUN_Message DoTransaction(STUN_Message request,Socket socket,IPEndPoint remoteEndPoint)
{
byte[] requestBytes = request.ToByteData();
DateTime startTime = DateTime.Now;
// We do it only 2 sec and retransmit with 100 ms.
while(startTime.AddSeconds(2) > DateTime.Now){
try{
socket.SendTo(requestBytes,remoteEndPoint);
// We got response.
if(socket.Poll(100,SelectMode.SelectRead)){
byte[] receiveBuffer = new byte[512];
socket.Receive(receiveBuffer);
// Parse message
STUN_Message response = new STUN_Message();
response.Parse(receiveBuffer);
// Check that transaction ID matches or not response what we want.
if(request.TransactionID.Equals(response.TransactionID)){
return response;
}
}
}
catch{
}
}
return null;
}
