CSMTPConnection::__ProcessCommand

function __ProcessCommand($command, $arg = '')
{
	switch(mb_strtoupper($command))
	{
		case "HELO":
			$this->Send('250', 'domain name should be qualified');
			if(trim($arg) == '')
			{
				$this->host = $this->ip;
			}
			else
			{
				$this->host = $arg;
			}
			//500, 501, 504, 421
			break;
		case "SEND":
		case "SOML":
		case "SAML":
		case "MAIL":
			if(!preg_match('#FROM[ ]*:[ ]*(.+)#i', $arg, $arMatches))
			{
				$this->Send('501', 'Unrecognized parameter '.$arg);
			}
			elseif($this->arMsg["FROM"])
			{
				$this->Send('503', 'Sender already specified');
			}
			else
			{
				$email = $arMatches[1];
				$email = CMailUtil::ExtractMailAddress($email);
				if($email == '' || !check_email($email))
				{
					$this->Send('501', '<'.$email.'> Invalid Address');
				}
				else
				{
					$this->arMsg["FROM"] = $email;
					$this->arMsg["TO"] = array();

					$this->Send('250', '<'.$email.'> Sender ok');
				}
			}
			//F: 552, 451, 452
			//E: 500, 501, 421
			break;
		case "RCPT":
			if(!preg_match('#TO[ ]*:[ ]*(.+)#i', $arg, $arMatches))
			{
				$this->Send('501', 'Unrecognized parameter '.$arg);
			}
			else
			{
				$email = $arMatches[1];
				$email = CMailUtil::ExtractMailAddress($email);
				if($email == '' || !check_email($email))
				{
					$this->Send('501', '<'.$email.'> Invalid Address');
				}
				elseif(false)
				{
					$this->Send('550', '<'.$email.'> User unknown');
				}
				elseif(!$this->CheckRelaying($email))
				{
					$this->Send('550', '<'.$email.'>... Relaying denied.');
				}
				elseif(!$this->arMsg["FROM"])
				{
					$this->Send('503', 'Sender is not specified');
				}
				else
				{
					$this->arMsg["TO"][] = $email;
					$this->Send('250', '<'.$email.'> ok');

					//S: 250, 251
					//F: 550, 551, 552, 553, 450, 451, 452
					//E: 500, 501, 503, 421
				}
			}
			break;
		case "DATA":
			if(!$this->arMsg["FROM"] || !$this->arMsg["TO"] || count($this->arMsg["TO"]) == 0)
			{
				$this->Send('503');
			}
			else
			{
				$this->Send('354');
				$this->__listenFunc = '__DataHandler';
			}
			// I: 354 -> data -> S: 250
			//                      F: 552, 554, 451, 452
			//   F: 451, 554
			//   E: 500, 501, 503, 421
			break;
		case "RSET":
			$this->Send('250', 'Resetting');
			$this->arMsg = array('LOCAL_ID' => md5(uniqid()));
			//E: 500, 501, 504, 421
			break;
		case "QUIT":
			$this->Send('221');
			$this->Disconnect();
			//E: 500
			break;
		case "EHLO":
			if(trim($arg) == '')
			{
				$this->host = $this->ip;
			}
			else
			{
				$this->host = $arg;
			}

			$this->Send('250-ehlo', '');
			$this->Send('250-AUTH LOGIN PLAIN', '');
			//$this->Send('250-SIZE', '');
			$this->Send('250-HELP', '');
			$this->Send('250', 'EHLO');
			/*
			250-mail.company2.tld is pleased to meet you
			250-DSN
			250-SIZE
			250-STARTTLS
			250-AUTH LOGIN PLAIN CRAM-MD5 DIGEST-MD5 GSSAPI MSN NTLM
			250-ETRN
			250-TURN
			250-ATRN
			250-NO-SOLICITING
			250-HELP
			250-PIPELINING
			250 EHLO
			*/
			break;
		case "AUTH":
			if($this->authorized)
			{
				$this->Send('503', 'Already authorized');
			}
			elseif(count($this->arMsg) > 1)
			{
				$this->Send('503', 'Mail transaction is active');
			}
			elseif(!preg_match('#^([A-Z0-9-_]+)[ ]*(S*)$#i', $arg, $arMatches))
			{
				$this->Send('501', 'Unrecognized parameter '.$arg);
			}
			else
			{
				switch(mb_strtoupper($arMatches[1]))
				{
					case "LOGIN":
						$this->Send('334', 'VXNlcm5hbWU6');
						$this->__listenFunc = '__AuthLoginHandler';
						$this->__login = false;
						break;
					case "PLAIN":
						if($arMatches[2] && trim($arMatches[2]) != '')
						{
							$pwd = base64_decode($arMatches[2]);
							$this->Authorize($pwd, $pwd);
						}
						else
						{
							$this->Send('334', '');
							$this->__listenFunc = '__AuthPlainHandler';
						}
						break;
					default:
						$this->Send('504', 'Unrecognized authentication type.');
				}
			}

			break;
		case "NOOP":
			$this->Send('250');
			//E: 500, 421
			break;
		case "HELP":
			//       S: 211, 214
			//       E: 500, 501, 502, 504, 421
			break;
		case "EXPN":
			//
			//       S: 250
			//       F: 550
			//       E: 500, 501, 502, 504, 421
			break;
		case "VRFY":
			//       S: 250, 251
			//       F: 550, 551, 553
			//       E: 500, 501, 502, 504, 421
			break;
		default:
			$this->Send('500', $command.' command unrecognized');
	}
	return true;
}