/// <summary>
/// Some broken NATs will reply to TCP KeepAlive even after the client initiating the connection has long gone,
/// This methods prevent such connections from hanging around indefinitely by sending an unsolicited ECHO response to make sure the connection is still alive.
/// </summary>
public void SendSMBKeepAlive(TimeSpan inactivityDuration)
{
List <ConnectionState> connections = new List <ConnectionState>(m_activeConnections);
foreach (ConnectionState connection in connections)
{
if (connection.LastReceiveDT.Add(inactivityDuration) < DateTime.UtcNow &&
connection.LastSendDT.Add(inactivityDuration) < DateTime.UtcNow)
{
if (connection is SMB1ConnectionState)
{
// [MS-CIFS] Clients SHOULD, at minimum, send an SMB_COM_ECHO to the server every few minutes.
// This means that an unsolicited SMB_COM_ECHO reply is not likely to be sent on a connection that is alive.
SmbLibraryStd.SMB1.SMB1Message echoReply = SMB1.EchoHelper.GetUnsolicitedEchoReply();
SMBServer.EnqueueMessage(connection, echoReply);
}
else if (connection is SMB2ConnectionState)
{
SmbLibraryStd.SMB2.EchoResponse echoResponse = SMB2.EchoHelper.GetUnsolicitedEchoResponse();
SMBServer.EnqueueResponse(connection, echoResponse);
}
}
}
}
private void btnStart_Click(object sender, EventArgs e)
{
IPAddress serverAddress = (IPAddress)comboIPAddress.SelectedValue;
SMBTransportType transportType;
if (rbtNetBiosOverTCP.Checked)
{
transportType = SMBTransportType.NetBiosOverTCP;
}
else
{
transportType = SMBTransportType.DirectTCPTransport;
}
NTLMAuthenticationProviderBase authenticationMechanism;
if (chkIntegratedWindowsAuthentication.Checked)
{
authenticationMechanism = new IntegratedNTLMAuthenticationProvider();
}
else
{
UserCollection users;
try
{
users = ReadUserSettings();
}
catch
{
MessageBox.Show("Cannot read " + SettingsFileName, "Error");
return;
}
authenticationMechanism = new IndependentNTLMAuthenticationProvider(users.GetUserPassword);
}
SMBShareCollection shares;
try
{
shares = ReadShareSettings();
}
catch (Exception)
{
MessageBox.Show("Cannot read " + SettingsFileName, "Error");
return;
}
GSSProvider securityProvider = new GSSProvider(authenticationMechanism);
m_server = new SmbLibraryStd.Server.SMBServer(shares, securityProvider);
m_logWriter = new LogWriter();
// The provided logging mechanism will synchronously write to the disk during server activity.
// To maximize server performance, you can disable logging by commenting out the following line.
m_server.LogEntryAdded += new EventHandler <LogEntry>(m_logWriter.OnLogEntryAdded);
try
{
m_server.Start(serverAddress, transportType, chkSMB1.Checked, chkSMB2.Checked);
if (transportType == SMBTransportType.NetBiosOverTCP)
{
if (serverAddress.AddressFamily == AddressFamily.InterNetwork && !IPAddress.Equals(serverAddress, IPAddress.Any))
{
IPAddress subnetMask = NetworkInterfaceHelper.GetSubnetMask(serverAddress);
m_nameServer = new NameServer(serverAddress, subnetMask);
m_nameServer.Start();
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error");
return;
}
btnStart.Enabled = false;
btnStop.Enabled = true;
comboIPAddress.Enabled = false;
rbtDirectTCPTransport.Enabled = false;
rbtNetBiosOverTCP.Enabled = false;
chkSMB1.Enabled = false;
chkSMB2.Enabled = false;
chkIntegratedWindowsAuthentication.Enabled = false;
}