/// <summary>
/// Starts operation processing.
/// </summary>
/// <param name="owner">Owner SMTP client.</param>
/// <returns>Returns true if asynchronous operation in progress or false if operation completed synchronously.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>owner</b> is null reference.</exception>
internal bool Start(SMTP_Client owner)
{
if(owner == null){
throw new ArgumentNullException("owner");
}
m_pSmtpClient = owner;
SetState(AsyncOP_State.Active);
try{
/* RFC 4954 4. The AUTH Command.
AUTH mechanism [initial-response]
Arguments:
mechanism: A string identifying a [SASL] authentication mechanism.
initial-response: An optional initial client response. If
present, this response MUST be encoded as described in Section
4 of [BASE64] or contain a single character "=".
*/
if(m_pSASL.SupportsInitialResponse){
byte[] buffer = Encoding.UTF8.GetBytes("AUTH " + m_pSASL.Name + " " + Convert.ToBase64String(m_pSASL.Continue(null)) + "\r\n");
// Log
m_pSmtpClient.LogAddWrite(buffer.Length,Encoding.UTF8.GetString(buffer).TrimEnd());
// Start command sending.
m_pSmtpClient.TcpStream.BeginWrite(buffer,0,buffer.Length,this.AuthCommandSendingCompleted,null);
}
else{
byte[] buffer = Encoding.UTF8.GetBytes("AUTH " + m_pSASL.Name + "\r\n");
// Log
m_pSmtpClient.LogAddWrite(buffer.Length,"AUTH " + m_pSASL.Name);
// Start command sending.
m_pSmtpClient.TcpStream.BeginWrite(buffer,0,buffer.Length,this.AuthCommandSendingCompleted,null);
}
}
catch(Exception x){
m_pException = x;
m_pSmtpClient.LogAddException("Exception: " + x.Message,x);
SetState(AsyncOP_State.Completed);
}
// Set flag rise CompletedAsync event flag. The event is raised when async op completes.
// If already completed sync, that flag has no effect.
lock(m_pLock){
m_RiseCompleted = true;
return m_State == AsyncOP_State.Active;
}
}
