|
public static CreateResponseAuthenticator ( string sharedSecret, |
||
| sharedSecret | string | The shared secret key. |
| requestPacket | RADIUS packet sent from client to server. | |
| responsePacket | RADIUS packet sent from server to client. | |
| return | byte[] | |
/// <summary>
/// Send a request to the server and waits for a response back.
/// </summary>
/// <param name="request">Request to be sent to the server.</param>
/// <returns>Response packet if a valid response is received from the server; otherwise Nothing.</returns>
public RadiusPacket ProcessRequest(RadiusPacket request)
{
CheckDisposed();
// We wait indefinitely for the connection to establish. But since this is UDP, the connection
// will always be successful (locally we're binding to any available UDP port).
if (m_udpClient.CurrentState != ClientState.Connected)
{
return(null);
}
RadiusPacket response = null;
// We have a UDP socket we can use for exchanging packets.
DateTime stopTime;
for (int i = 1; i <= m_requestAttempts; i++)
{
m_responseBytes = null;
m_udpClient.Send(request.BinaryImage());
stopTime = DateTime.UtcNow.AddMilliseconds(m_reponseTimeout);
while (true)
{
Thread.Sleep(1);
// Stay in the loop until:
// 1) We receive a response OR
// 2) We exceed the response timeout duration
if ((object)m_responseBytes != null || DateTime.UtcNow > stopTime)
{
break;
}
}
if ((object)m_responseBytes != null)
{
// The server sent a response.
response = new RadiusPacket(m_responseBytes, 0, m_responseBytes.Length);
if (response.Identifier == request.Identifier && response.Authenticator.CompareTo(RadiusPacket.CreateResponseAuthenticator(m_sharedSecret, request, response)) == 0)
{
break;
}
// The response failed the verification, so we'll silently discard it.
response = null;
}
}
return(response);
}