private static void HandshakeCallback(IAsyncResult result)
{
if (!result.CompletedSynchronously)
{
SmtpConnection.ConnectAndHandshakeAsyncResult asyncState = (SmtpConnection.ConnectAndHandshakeAsyncResult)result.AsyncState;
try
{
try
{
LineInfo info = asyncState.connection.Reader.CurrentReader.EndReadLine(result);
if (info.StatusCode != SmtpStatusCode.ServiceReady)
{
asyncState.InvokeCallback(new SmtpException(info.StatusCode, info.Line, true));
}
else if (!asyncState.SendEHello())
{
}
}
catch (SmtpException)
{
if (!asyncState.SendHello())
{
}
}
}
catch (Exception exception)
{
asyncState.InvokeCallback(exception);
}
}
}
private static void SendEHelloCallback(IAsyncResult result)
{
if (!result.CompletedSynchronously)
{
SmtpConnection.ConnectAndHandshakeAsyncResult asyncState = (SmtpConnection.ConnectAndHandshakeAsyncResult)result.AsyncState;
try
{
try
{
asyncState.connection.extensions = EHelloCommand.EndSend(result);
asyncState.connection.ParseExtensions(asyncState.connection.extensions);
if (asyncState.connection.pooledStream.NetworkStream is TlsStream)
{
asyncState.Authenticate();
return;
}
}
catch (SmtpException exception)
{
if ((exception.StatusCode != SmtpStatusCode.CommandUnrecognized) && (exception.StatusCode != SmtpStatusCode.CommandNotImplemented))
{
throw exception;
}
if (!asyncState.SendHello())
{
return;
}
}
if (asyncState.connection.EnableSsl)
{
if (!asyncState.connection.serverSupportsStartTls && !(asyncState.connection.pooledStream.NetworkStream is TlsStream))
{
throw new SmtpException(SR.GetString("MailServerDoesNotSupportStartTls"));
}
asyncState.SendStartTls();
}
else
{
asyncState.Authenticate();
}
}
catch (Exception exception2)
{
asyncState.InvokeCallback(exception2);
}
}
}
