private void SaveMessage(Message e)
{
// make sure the subject isn't to long
string subject = TextFunctions.Remove(e.Subject, Path.GetInvalidFileNameChars());
if (subject.Length > 100)
{
subject = string.Concat(subject.Substring(0, 100), " ...");
}
string fileName = path + Path.DirectorySeparatorChar + e.MessageId + ".eml";
string mailData = e.XSender + Environment.NewLine + e.XReceiver + Environment.NewLine + e.Data;
File.WriteAllText(fileName, mailData);
Console.WriteLine("Message with ID: " + e.MessageId + " saved.");
}
public void Start()
{
listener.Start();
status = StatusEnum.Connected;
Message message = null;
Console.WriteLine("Start SMTP Server");
try
{
socket = listener.AcceptSocket();
networkStream = new NetworkStream(socket, FileAccess.ReadWrite, true);
WriteLine(string.Format("220 Welcome {0}, SMTP Server.", ((IPEndPoint)socket.RemoteEndPoint).Address));
while (socket.Connected)
{
string data = this.Read(lineTerminator);
if (data == null)
{
break;
}
else
{
if (data.StartsWith("QUIT", StringComparison.InvariantCultureIgnoreCase))
{
WriteLine("221 Good bye");
throw new Exception("Restart SMTP Server");
}
else if (data.StartsWith("EHLO", StringComparison.InvariantCultureIgnoreCase) || data.StartsWith("HELO", StringComparison.InvariantCultureIgnoreCase))
{
this.WriteGreeting(data.Substring(4).Trim());
status = StatusEnum.Identified;
}
else if (status < StatusEnum.Identified)
{
this.WriteError(ErrorEnum.BadCommandSequence, "Expected HELO <Your Name>");
}
else
{
if (data.StartsWith("MAIL", StringComparison.InvariantCultureIgnoreCase))
{
if (status != StatusEnum.Identified && status != StatusEnum.Data)
{
this.WriteError(ErrorEnum.BadCommandSequence, "Command out of sequence");
}
else
{
// create a new message
message = new Message();
message.From = TextFunctions.Tail(data, ":");
status = StatusEnum.Mail;
this.WriteOk();
}
}
else if (data.StartsWith("RCPT", StringComparison.InvariantCultureIgnoreCase))
{
if (status != StatusEnum.Mail && status != StatusEnum.Recipient)
{
this.WriteError(ErrorEnum.BadCommandSequence, "Command out of sequence");
}
else
{
message.To.Add(TextFunctions.Tail(data, ":"));
status = StatusEnum.Recipient;
this.WriteOk();
}
}
else if (data.StartsWith("DATA", StringComparison.InvariantCultureIgnoreCase))
{
// request data
this.WriteSendData();
message.Data = this.Read(dataTerminator);
// Remove message end tag
message.Data = message.Data.Replace(dataTerminator, string.Empty);
SaveMessage(message);
message = null;
status = StatusEnum.Data;
this.WriteOk();
}
else
{
this.WriteError(ErrorEnum.CommandNotImplemented, "Command not implemented");
}
}
}
}
}
catch (Exception e)
{
Debug(e.Message);
Dispose();
Start();
}
}