private bool AuthenticateContinue()
{
for (;;)
{
// We don't need credential on the continued auth assuming they were captured on the first call.
// That should always work, otherwise what if a new credential has been returned?
Authorization auth = _connection._authenticationModules[_currentModule].Authenticate(_authResponse, null, _connection, _connection._client.TargetName, _connection._channelBindingToken);
if (auth == null)
{
throw new SmtpException(string.Format(Strings.SmtpAuthenticationFailed));
}
IAsyncResult result = AuthCommand.BeginSend(_connection, auth.Message, s_authenticateContinueCallback, this);
if (!result.CompletedSynchronously)
{
return(false);
}
LineInfo info = AuthCommand.EndSend(result);
if ((int)info.StatusCode == 235)
{
_connection._authenticationModules[_currentModule].CloseContext(_connection);
_connection._isConnected = true;
InvokeCallback();
return(false);
}
else if ((int)info.StatusCode != 334)
{
return(true);
}
_authResponse = info.Line;
}
}
private static void AuthenticateContinueCallback(IAsyncResult result)
{
if (!result.CompletedSynchronously)
{
ConnectAndHandshakeAsyncResult thisPtr = (ConnectAndHandshakeAsyncResult)result.AsyncState;
try
{
LineInfo info = AuthCommand.EndSend(result);
if ((int)info.StatusCode == 235)
{
thisPtr._connection._authenticationModules[thisPtr._currentModule].CloseContext(thisPtr._connection);
thisPtr._connection._isConnected = true;
thisPtr.InvokeCallback();
return;
}
else if ((int)info.StatusCode == 334)
{
thisPtr._authResponse = info.Line;
if (!thisPtr.AuthenticateContinue())
{
return;
}
}
thisPtr.Authenticate();
}
catch (Exception e)
{
thisPtr.InvokeCallback(e);
}
}
}
private void Authenticate()
{
//if no credentials were supplied, try anonymous
//servers don't appear to anounce that they support anonymous login.
if (_connection._credentials != null)
{
while (++_currentModule < _connection._authenticationModules.Length)
{
//only authenticate if the auth protocol is supported
ISmtpAuthenticationModule module = _connection._authenticationModules[_currentModule];
if (!_connection.AuthSupported(module))
{
continue;
}
NetworkCredential credential = _connection._credentials.GetCredential(_host, _port, module.AuthenticationType);
if (credential == null)
{
continue;
}
Authorization auth = _connection.SetContextAndTryAuthenticate(module, credential, _outerResult);
if (auth != null && auth.Message != null)
{
IAsyncResult result = AuthCommand.BeginSend(_connection, _connection._authenticationModules[_currentModule].AuthenticationType, auth.Message, s_authenticateCallback, this);
if (!result.CompletedSynchronously)
{
return;
}
LineInfo info = AuthCommand.EndSend(result);
if ((int)info.StatusCode == 334)
{
_authResponse = info.Line;
if (!AuthenticateContinue())
{
return;
}
}
else if ((int)info.StatusCode == 235)
{
module.CloseContext(_connection);
_connection._isConnected = true;
break;
}
}
}
}
_connection._isConnected = true;
InvokeCallback();
}
