public void SendGreeting(NetworkStream stream)
{
SMTP_Message messg = new SMTP_Message((int)States.service_ready, Dns.GetHostName(), "Service ready");
byte[] msg = Encoding.ASCII.GetBytes(messg.ToString());
StreamWrite(stream, msg, 0, msg.Length);
}
public void StartSession(object session)
{
Console.WriteLine("New user has connected! ");
Session s = (Session)session;
TcpClient tempClient = s.client;
NetworkStream stream = tempClient.GetStream();
IMail mail;
bool disconnect = false;
int i = 0;
string data = null;
byte[] bytes = new byte[256];
byte[] msg;
SendGreeting(stream);
StringBuilder tempSb = new StringBuilder();
while ((i = stream.Read(bytes, 0, bytes.Length)) != 0 && !disconnect)
{
//Logic here
data = Encoding.ASCII.GetString(bytes, 0, i);
//data = data.ToUpper();
if (string.Compare(data, "/exit") == 0 || string.Compare(data, "/EXIT") == 0)
{
Console.WriteLine("Disconnect");
disconnect = true;
s.Disconnect();
}
else
{
ISMTP_Command command;
string error = null;
string response = null;
if (s.waitingForCommand)
{
command = s.ParseCommand(data, ref error, ref response);
if (command == null && error != null)
{
msg = Encoding.ASCII.GetBytes(error);
StreamWrite(stream, msg, 0, msg.Length);
}
else if (command != null)
{
SMTP_Message m = command.Launch(s); // Launch command changes state of a session
msg = Encoding.ASCII.GetBytes(m.ToString());
StreamWrite(stream, msg, 0, msg.Length);
}
else if (command == null)
{
if (!(i == 2 && string.Compare(data, "\r\n") == 0) &&
!(i == 21 &&
string.Compare(data, "??\u001f?? ??\u0018??'??\u0001??\u0003??\u0003") == 0))
{
SMTP_Message m = new SMTP_Message((int)States.command_not_implemented, "Bad command");
msg = Encoding.ASCII.GetBytes(m.ToString());
StreamWrite(stream, msg, 0, msg.Length);
}
}
}
else if (s.done)
{
s.Disconnect();
}
else
{
if (i == 1)
{
if (data[0] == '.')
{
s.mailData = tempSb.ToString();
Console.Write(s.mailData);
s.waitingForCommand = true;
SMTP_Message m = new SMTP_Message((int)States.action_ok, "Message accepted for delivery.");
msg = Encoding.ASCII.GetBytes(m.ToString());
StreamWrite(stream, msg, 0, msg.Length);
MailTypeResolver mtr = new MailTypeResolver();
foreach (string str in s.forwardPath)
{
try
{
mail = mtr.GetMailType(str);
mail.Send(s.reversePath, str, s.mailData);
}
catch (NotImplementedException)
{
m = new SMTP_Message((int)States.command_not_implemented, "Can't send to outside domains");
msg = Encoding.ASCII.GetBytes(m.ToString());
StreamWrite(stream, msg, 0, msg.Length);
}
}
}
}
tempSb.Append(data);
}
}
}
tempClient.Close();
}