/// <summary>
/// Closes the connection with a client, logs a reason, and updates the queue.
/// </summary>
/// <param name="reason">Reason to disconnect the client</param>
public void Close(string reason = "unknown")
{
Logging.Log(Logging.LogSeverity.Warning, $"Closing {UserName}({this.User?.ToString() ?? "n/a"}) due to {reason}");
try
{
this.User.Connection = null;
} catch { }
try
{
Client.Close();
}
catch { }
Listening = false;
try
{
listenThread.Abort();
}
catch { }
lock (LockClient)
{
CurrentClients.Remove(this);
ClientQueue.Remove(this);
while (CurrentClients.Count < Program.Options.Maximum_Concurrent_Connections)
{//accepting the next people in the queue
if (ClientQueue.Count == 0)
{
break;
}
ClientQueue[0].AcceptFromQueue();
CurrentClients.Add(ClientQueue[0]);
ClientQueue.RemoveAt(0);
}
}
}
void s_IpPacketReceived(object sender, EventArgs e)
{
IPHeader ipHeader = (IPHeader)sender;
if (ipHeader.ProtocolType == Protocol.Tcp)
{
try {
TCPHeader tcp = new TCPHeader(ipHeader.Data, ipHeader.MessageLength);
int sourcePort;
int destinationPort;
if (int.TryParse(tcp.SourcePort, out sourcePort) && int.TryParse(tcp.DestinationPort, out destinationPort))
{
if (destinationPort == ((Pop3Config)Configuration.AgentSettings).Pop3Port)
{
if (tcp.Data.Length > 0)
{
AppLayerPop3 pop3 = new AppLayerPop3(tcp.Data, tcp.Data.Length);
if (!CurrentClients.ContainsKey(sourcePort))
{
CurrentClients.Add(sourcePort, new Pop3Client());
}
CurrentClients[sourcePort].LastInteraction = DateTime.Now;
switch (pop3.Pop3Code.ToUpper())
{
case AppLayerPop3.POP3_INTERACTION_CODE_LIST:
CurrentClients[sourcePort].LastMessage = Pop3Message.LIST;
break;
case AppLayerPop3.POP3_INTERACTION_CODE_DELE:
CurrentClients[sourcePort].LastMessage = Pop3Message.DELE;
break;
case AppLayerPop3.POP3_INTERACTION_CODE_NOOP:
CurrentClients[sourcePort].LastMessage = Pop3Message.NOOP;
break;
case AppLayerPop3.POP3_INTERACTION_CODE_PASS:
CurrentClients[sourcePort].LastMessage = Pop3Message.PASS;
break;
case AppLayerPop3.POP3_INTERACTION_CODE_QUIT:
if (CurrentClients.ContainsKey(sourcePort))
{
CurrentClients.Remove(sourcePort);
}
break;
case AppLayerPop3.POP3_INTERACTION_CODE_RETR:
CurrentClients[sourcePort].LastMessage = Pop3Message.RETR;
break;
case AppLayerPop3.POP3_INTERACTION_CODE_RSET:
CurrentClients[sourcePort].LastMessage = Pop3Message.RSET;
break;
case AppLayerPop3.POP3_INTERACTION_CODE_STAT:
CurrentClients[sourcePort].LastMessage = Pop3Message.STAT;
break;
case AppLayerPop3.POP3_INTERACTION_CODE_TOP:
CurrentClients[sourcePort].LastMessage = Pop3Message.TOP;
break;
case AppLayerPop3.POP3_INTERACTION_CODE_UIDL:
CurrentClients[sourcePort].LastMessage = Pop3Message.UIDL;
break;
case AppLayerPop3.POP3_INTERACTION_CODE_USER:
CurrentClients[sourcePort].LastMessage = Pop3Message.USER;
break;
}
}
// Console.WriteLine("Flags: {0}\tAck: {1}\tSeq:{2}", tcp.Flags, tcp.AcknowledgementNumber, tcp.SequenceNumber);
// Console.WriteLine("Source: {0}:{1}\tDestination: {2}:{3}", ipHeader.SourceAddress, tcp.SourcePort, ipHeader.DestinationAddress, tcp.DestinationPort);
}
}
} catch (Exception ex) {
Sniffer.LogTrace(ex);
}
}
}
