// dump the current settings
private static void dumpSettings()
{
// base/network
AppGlobals.writeConsole("Host name..................: {0}", AppGlobals.hostName);
AppGlobals.writeConsole("listen IP..................: {0}", AppGlobals.listenAddress);
AppGlobals.writeConsole("listen port................: {0}", AppGlobals.listenPort);
AppGlobals.writeConsole("Receive timeout............: {0}", AppGlobals.receiveTimeout);
// hardlimits
AppGlobals.writeConsole("Max errors.................: {0}", AppGlobals.maxSmtpErr);
AppGlobals.writeConsole("Max NOOP...................: {0}", AppGlobals.maxSmtpNoop);
AppGlobals.writeConsole("Max VRFY/EXPN..............: {0}", AppGlobals.maxSmtpVrfy);
AppGlobals.writeConsole("Max RCPT TO................: {0}", AppGlobals.maxSmtpRcpt);
// sessions
AppGlobals.writeConsole("Max messages per session...: {0}", AppGlobals.maxMessages);
AppGlobals.writeConsole("Max parallel sessions......: {0}", AppGlobals.maxSessions);
// messages
AppGlobals.writeConsole("Store message data.........: {0}", AppGlobals.storeData);
AppGlobals.writeConsole("Storage path...............: {0}", AppGlobals.storePath);
AppGlobals.writeConsole("Max message size...........: {0}", AppGlobals.maxDataSize);
// logs
AppGlobals.writeConsole("Logfiles path..............: {0}", AppGlobals.logPath);
AppGlobals.writeConsole("Verbose logging............: {0}", AppGlobals.logVerbose);
// tarpitting
AppGlobals.writeConsole("Initial banner delay.......: {0}", AppGlobals.bannerDelay);
AppGlobals.writeConsole("Error delay................: {0}", AppGlobals.errorDelay);
// filtering/rejecting
AppGlobals.writeConsole("Do tempfail (4xx) on DATA..: {0}", AppGlobals.doTempFail);
AppGlobals.writeConsole("Check for early talkers....: {0}", AppGlobals.earlyTalkers);
// DNS filtering
AppGlobals.writeConsole("DNS Whitelists.............: {0}", AppGlobals.whiteLists.Length);
AppGlobals.writeConsole("DNS Blacklists.............: {0}", AppGlobals.blackLists.Length);
// local domains/mailboxes
AppGlobals.writeConsole("Local domains..............: {0}", AppGlobals.LocalDomains.Count);
AppGlobals.writeConsole("Local mailboxes............: {0}", AppGlobals.LocalMailBoxes.Count);
}
// closes the socket, terminates the session
private void closeSession()
{
if (null != this._client)
{
if (this._client.Connected)
{
sleepDown(25);
}
try { this._client.Close(); this._client = null; }
catch { }
if (!string.IsNullOrEmpty(this._clientIP))
{
AppGlobals.writeConsole("client {0} disconnected, sess={1}, ID={2}.", this._clientIP, this._sessCount, this._sessionID);
}
}
this._initOk = false;
long sesscount = AppGlobals.removeSession();
resetSession();
}
private string _mailDom = null; // domain part of a mail address
#endregion
#region "instance"
// init
public SMTPsession(TcpClient client)
{
try
{
this._sessCount = AppGlobals.addSession();
this._sessionID = AppGlobals.sessionID();
this._hostName = AppGlobals.hostName;
if (null != AppGlobals.LocalDomains)
{
this._mailDomains = AppGlobals.LocalDomains;
}
if (null != AppGlobals.LocalMailBoxes)
{
this._mailBoxes = AppGlobals.LocalMailBoxes;
}
this._client = client;
this._clientIP = this._client.Client.RemoteEndPoint.ToString();
int i = this._clientIP.IndexOf(':');
if (-1 != i)
{
this._clientIP = this._clientIP.Substring(0, i);
}
this._client.ReceiveTimeout = AppGlobals.receiveTimeout;
this._stream = this._client.GetStream();
this._reader = new StreamReader(this._stream);
this._writer = new StreamWriter(this._stream);
this._writer.NewLine = "\r\n";
this._writer.AutoFlush = true;
AppGlobals.writeConsole("client {0} connected, sess={1}, ID={2}.", this._clientIP, this._sessCount, this._sessionID);
this._initOk = true;
}
catch (Exception ex)
{
AppGlobals.writeConsole("SMTPsession::Exception: " + ex.Message);
closeSession();
}
}
// main entry point
static int Main(string[] args)
{
// our internal stuff
IPAddress listenAddr = IPAddress.Loopback;
int listenPort = 25;
int retCode = 0;
// load the config
loadConfig();
// tell we're starting up and, if verbose, dump config parameters
AppGlobals.writeConsole("{0} {1} starting up (NET {2})", AppGlobals.appName, AppGlobals.appVersion, AppGlobals.appRuntime);
if (AppGlobals.logVerbose)
{
dumpSettings();
}
// setup the listening IP:port
listenAddr = AppGlobals.listenIP;
listenPort = AppGlobals.listenPort;
// try starting the listener
try
{
listener = new TcpListener(listenAddr, listenPort);
listener.Start();
}
catch (Exception ex)
{
AppGlobals.writeConsole("Listener::Error: " + ex.Message);
return(1);
}
// tell we're ready to accept connections
AppGlobals.writeConsole("Listening for connections on {0}:{1}", listenAddr, listenPort);
// run until interrupted (Ctrl-C in our case)
while (!timeToStop)
{
try
{
// wait for an incoming connection, accept it and spawn a thread to handle it
SMTPsession handler = new SMTPsession(listener.AcceptTcpClient());
Thread thread = new System.Threading.Thread(new ThreadStart(handler.handleSession));
thread.Start();
}
catch (Exception ex)
{
// we got an error
retCode = 2;
AppGlobals.writeConsole("Handler::Error: " + ex.Message);
timeToStop = true;
}
}
// finalize
if (null != listener)
{
try { listener.Stop(); }
catch { }
}
return(retCode);
}
