internal static void ProcessData(ClientProcessor processor, string data)
{
data = data.Replace("\r", "");
var dta = data.Split('\n');
foreach (var dt in dta)
{
if (dt == ".")
{
processor.CaptureData = 0;
processor.Transaction.Body = processor.DataBuilder.ToString();
if (processor.Server.Options.MessageCharactersLimit != 0 &&
processor.Server.Options.MessageCharactersLimit < processor.Counter)
{
processor.Transaction = null;
processor.WriteCode(552, "5.4.3", "Message size exceeds the administrative limit.");
return;
}
if (!string.IsNullOrEmpty(processor.Username))
{
processor.Transaction.AuthenticatedUser = processor.Username;
}
if (processor.Server.Filter != null)
{
var filterResult = processor.Server.Filter.CanProcessTransaction(processor.Transaction);
if (filterResult.Type != SmtpResultType.Success)
{
processor.Transaction = null;
processor.WriteCode(554,
filterResult.Type == SmtpResultType.PermanentFail ? "5.7.1" : "4.7.1",
string.IsNullOrWhiteSpace(filterResult.FailMessage)
? "Delivery not authorized, message refused"
: filterResult.FailMessage);
return;
}
}
var delivery = (MailTransaction)processor.Transaction.Clone();
processor.Transaction = null;
Task.Run(() => processor.Server.DeliverMessage(delivery));
processor.WriteCode(250, "2.3.0");
return;
}
processor.Counter += (ulong)dt.Length;
if (processor.Server.Options.MessageCharactersLimit == 0 ||
processor.Server.Options.MessageCharactersLimit >= processor.Counter)
{
processor.DataBuilder.AppendLine(dt);
}
}
}
internal static void ProcessCommand(ClientProcessor processor, string data)
{
if (processor.Server.AuthLogin == null)
{
processor.WriteCode(502, "5.5.1");
return;
}
if (processor.Server.Options.RequireEncryptionForAuth && !processor.Secure)
{
processor.WriteCode(538, "5.7.11");
return;
}
var args = data.Contains(" ") ? data.Split(' ') : new[] { data };
switch (args[0].ToUpper())
{
case "LOGIN":
processor.CaptureData = 2;
processor.WriteText("334 VXNlcm5hbWU6");
break;
case "PLAIN":
if (args.Length == 1)
{
processor.CaptureData = 4;
processor.WriteText("334");
}
else
{
processor.Username = AuthPlain(processor, args[1]);
if (processor.Username == null)
{
processor.WriteCode(535, "5.7.8", "Authentication credentials invalid");
}
else
{
processor.WriteCode(235, "2.7.0", "Authentication Succeeded");
}
}
break;
default:
processor.WriteCode(501, "5.7.4", "Unrecognized Authentication Method");
break;
}
}
internal static void ProcessData(ClientProcessor processor, string data)
{
switch (processor.CaptureData)
{
case 2:
processor.TempUsername = Misc.Base64.Base64Decode(data);
processor.CaptureData = 3;
processor.WriteText("334 UGFzc3dvcmQ6");
break;
case 3:
processor.CaptureData = 0;
if (processor.Server.AuthLogin == null)
{
processor.WriteCode(454, "4.7.0", "Temporary authentication failure");
return;
}
var decode = Misc.Base64.Base64Decode(data);
if (processor.TempUsername != null && decode != null && processor.Server.AuthLogin.AuthLogin(processor.TempUsername, decode, processor.RemoteEndPoint, processor.Secure))
{
processor.WriteCode(235, "2.7.0", "Authentication Succeeded");
processor.Username = processor.TempUsername;
}
else
{
processor.WriteCode(535, "5.7.8", "Authentication credentials invalid");
}
processor.TempUsername = null;
break;
case 4:
processor.CaptureData = 0;
processor.Username = AuthPlain(processor, data);
if (processor.Username == null)
{
processor.WriteCode(535, "5.7.8", "Authentication credentials invalid");
}
else
{
processor.WriteCode(235, "2.7.0", "Authentication Succeeded");
}
break;
}
}
internal static void ProcessCommand(ClientProcessor processor, string command, string data)
{
switch (command)
{
case "RSET":
processor.Transaction = null;
processor.WriteCode(250, "2.1.5", "Flushed");
break;
case "MAIL FROM":
{
var address = ProcessAddress(data);
if (address == null)
{
processor.WriteCode(501, "5.5.2");
}
else
{
if (processor.Server.Filter != null)
{
var result = processor.Server.Filter.IsAllowedSender(address, processor.RemoteEndPoint);
if (result.Type != SmtpResultType.Success)
{
processor.WriteCode(554,
result.Type == SmtpResultType.PermanentFail ? "5.7.1" : "4.7.1",
string.IsNullOrWhiteSpace(result.FailMessage)
? "Delivery not authorized, message refused"
: result.FailMessage);
return;
}
}
processor.Transaction = new MailTransaction()
{
From = address,
RemoteEndPoint = processor.RemoteEndPoint,
Encryption = processor.Encryption
};
processor.WriteCode(250, "2.0.0");
}
}
break;
case "RCPT TO":
{
if (processor.Transaction == null)
{
processor.WriteCode(503, "5.5.1", "MAIL FROM first.");
return;
}
var address = ProcessAddress(data);
if (address == null)
{
processor.WriteCode(501);
}
else
{
if (processor.Server.Options.RecipientsLimit > 0 && processor.Server.Options.RecipientsLimit <= processor.Transaction.To.Count)
{
processor.WriteCode(550, "5.5.3", "Too many recipients");
return;
}
if (processor.Server.Filter != null)
{
var filterResult = processor.Server.Filter.CanDeliver(processor.Transaction.From, address, !string.IsNullOrEmpty(processor.Username), processor.Username, processor.RemoteEndPoint);
if (filterResult.Type != SmtpResultType.Success)
{
processor.WriteCode(550,
filterResult.Type == SmtpResultType.PermanentFail ? "5.7.1" : "4.7.1",
string.IsNullOrWhiteSpace(filterResult.FailMessage)
? "Delivery not authorized, message refused"
: filterResult.FailMessage);
return;
}
}
var result = processor.Server.MailDeliveryInterface.DoesUserExist(address);
switch (result)
{
case UserExistsCodes.BadDestinationMailboxAddress:
processor.WriteCode(550, "5.1.1", "Requested action not taken: Bad destination mailbox address");
return;
case UserExistsCodes.BadDestinationSystemAddress:
processor.WriteCode(550, "5.1.2", "Requested action not taken: Bad destination system address");
return;
case UserExistsCodes.DestinationMailboxAddressAmbiguous:
processor.WriteCode(550, "5.1.4", "Requested action not taken: Destination mailbox address ambiguous");
return;
case UserExistsCodes.DestinationAddressHasMovedAndNoForwardingAddress:
processor.WriteCode(550, "5.1.6", "Requested action not taken: Destination mailbox has moved, No forwarding address");
return;
case UserExistsCodes.BadSendersSystemAddress:
processor.WriteCode(550, "5.1.8", "Requested action not taken: Bad sender's mailbox address syntax");
return;
default:
processor.Transaction.To.Add(address);
processor.WriteCode(250, "2.1.5");
break;
}
}
}
break;
case "DATA":
if (processor.Transaction == null || processor.Transaction.To.Count == 0)
{
processor.WriteCode(503, "5.5.1", "RCPT TO first.");
return;
}
processor.DataBuilder = new StringBuilder();
processor.Counter = 0;
processor.CaptureData = 1;
processor.WriteCode(354);
break;
}
}
