private void HandleClient(object rawClient)
{
ClientData client = new ClientData();
try
{
// Prepare the connection.
using (TcpClient tcpClient = (TcpClient)rawClient)
{
NetworkStream clientStream = tcpClient.GetStream();
// Prepare the state variables.
byte[] buffer = new byte[4096];
string message = "";
bool isNewMessage = true;
bool running = true;
// Make sure we don't have rawClient hanging too long. Miliseconds.
clientStream.ReadTimeout = this.ClientTimeout;
clientStream.WriteTimeout = this.ClientTimeout;
var endPoint = tcpClient.Client.RemoteEndPoint as IPEndPoint;
if (endPoint != null)
{
client.Ip = endPoint.Address.ToString();
}
Logger.Instance.AddInformation(client, "### Client connected");
// Greet the rawClient.
this.SendClientData("220 buckthurn.oexenhave.dk SMTP Server", client, ref clientStream);
while (running)
{
// Reset the string is the message has been processed.
if (isNewMessage)
{
message = "";
}
// Do a read from the socket. Break if anything unexpected goes on.
int bytesRead;
try
{
bytesRead = clientStream.Read(buffer, 0, 4096);
}
catch (Exception)
{
Logger.Instance.AddInformation(client, "### Client inactive");
this.SendClientData("500 Inactive", client, ref clientStream);
break;
}
if (bytesRead == 0)
{
break;
}
message += this.encoder.GetString(buffer, 0, bytesRead);
// Allow telnet-like connections to work as well.
isNewMessage = message.EndsWith("\r\n");
// Process the message
if (isNewMessage)
{
// Process one line at a time.
foreach (string messageLine in message.Split(new[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries))
{
Logger.Instance.AddInformation(client, messageLine.Substring(0, Math.Min(255, messageLine.Length)));
// Intepretate the message.
this.ProcessMessage(this.GetMessageType(client, messageLine), messageLine, ref client, ref clientStream, ref running);
}
}
}
clientStream.Close();
tcpClient.Close();
}
}
catch (Exception ex)
{
Logger.Instance.AddError(client, "### Ending client thread due to an error", ex);
}
Logger.Instance.AddInformation(client, "### Client disconnected");
}
private void ProcessMessage(MessageType type, string message, ref ClientData client, ref NetworkStream clientStream, ref bool running)
{
switch (type)
{
case MessageType.EHLO:
{
if (client.State == ClientState.EHLO)
{
this.SendClientData("250 buckthurn.oexenhave.dk", client, ref clientStream);
client.State = ClientState.FROM;
}
else
{
this.SendClientData("503 Bad sequence of commands", client, ref clientStream);
}
break;
}
case MessageType.FROM:
{
this.SendClientData("250 OK", client, ref clientStream);
client.State = ClientState.TO;
break;
}
case MessageType.TO:
{
if (client.State == ClientState.TO || client.State == ClientState.DATA)
{
if (!message.Contains("@buckthurn.oexenhave.dk"))
{
this.SendClientData("550 No such user here", client, ref clientStream);
Logger.Instance.AddInformation("### Email disallowed: " + message);
}
else
{
this.SendClientData("250 OK", client, ref clientStream);
client.State = ClientState.DATA;
}
}
else
{
this.SendClientData("503 Bad sequence of commands", client, ref clientStream);
}
break;
}
case MessageType.DATA:
{
if (client.State == ClientState.DATA)
{
this.SendClientData("354 Start mail input; end with <CRLF>.<CRLF>", client, ref clientStream);
client.State = ClientState.DATA;
}
else
{
this.SendClientData("503 Bad sequence of commands", client, ref clientStream);
}
break;
}
case MessageType.CONTENT:
{
Logger.Instance.AddInformation(message);
//if (Message.IndexOf("Mindtrio-Quasar-Ident") > -1)
//{
// client.Ident = Message.Replace("Mindtrio-Quasar-Ident: ", "");
//}
//if (Message.IndexOf("Mindtrio-Quasar-Type") > -1)
//{
// client.Type = Message.Replace("Mindtrio-Quasar-Type: ", "");
//}
//if (!String.IsNullOrEmpty(client.Ident) && !String.IsNullOrEmpty(client.Type))
//{
// this.PushClient.ReportBounce(client.Type, client.Ident, this.AppSettings["PushKey"]);
// if (logger.IsInfoEnabled) logger.Info("Bounce reported. Type: {" + client.Type + "}. Ident: {" + client.Ident + "}.");
// client.Type = "";
// client.Ident = "";
//}
break;
}
case MessageType.CONTENTEND:
{
this.SendClientData("250 OK", client, ref clientStream);
client.State = ClientState.QUIT;
break;
}
case MessageType.QUIT:
{
running = false;
break;
}
case MessageType.UNKNOWN:
{
this.SendClientData("500 Syntax error, command unrecognized", client, ref clientStream);
break;
}
}
}
public void AddError(ClientData client, string message, Exception ex)
{
this.AddError("[" + client.Ip + "] " + message, ex);
}
public void AddWarning(ClientData client, string message)
{
this.AddWarning("[" + client.Ip + "] " + message);
}
public void AddInformation(ClientData client, string message)
{
this.AddInformation("[" + client.Ip + "] " + message);
}
