private void DhcpDiscover(DhcpMessage message)
{
Byte[] addressRequestData = message.GetOptionData(DhcpOption.AddressRequest);
if (addressRequestData == null)
{
addressRequestData = message.ClientAddress;
}
InternetAddress addressRequest = new InternetAddress(addressRequestData);
// Assume we're on an ethernet network
Byte[] hardwareAddressData = new Byte[6];
Array.Copy(message.ClientHardwareAddress, hardwareAddressData, 6);
PhysicalAddress clientHardwareAddress = new PhysicalAddress(hardwareAddressData);
AddressLease offer = null;
// If this client is explicitly allowed, or they are not denied and the allow any flag is set
if (this.m_Acl.ContainsKey(clientHardwareAddress) && this.m_Acl[clientHardwareAddress] ||
!this.m_Acl.ContainsKey(clientHardwareAddress) && this.m_AllowAny)
{
if (this.m_Reservations.ContainsKey(clientHardwareAddress))
{
offer = new AddressLease(clientHardwareAddress, this.m_Reservations[clientHardwareAddress], DateTime.Now.Add(this.m_LeaseDuration));
}
else
{
lock (this.m_LeaseSync)
{
if (!addressRequest.Equals(InternetAddress.Empty))
{
if (this.m_InactiveLeases.ContainsKey(addressRequest))
{
offer = this.m_InactiveLeases[addressRequest];
this.m_InactiveLeases.Remove(addressRequest);
this.m_ActiveLeases.Add(addressRequest, offer);
}
else if (this.m_ActiveLeases.ContainsKey(addressRequest) && this.m_ActiveLeases[addressRequest].Owner.Equals(clientHardwareAddress))
{
offer = this.m_ActiveLeases[addressRequest];
}
}
else if (this.m_InactiveLeases.Count > 0)
{
offer = this.m_InactiveLeases.Values[0];
this.m_InactiveLeases.Remove(offer.Address);
this.m_ActiveLeases.Add(offer.Address, offer);
}
}
}
}
if (offer == null)
{
this.SendNak(message);
}
else
{
offer.Acknowledged = false;
offer.Expiration = DateTime.Now.Add(this.m_OfferTimeout);
offer.SessionId = message.SessionId;
offer.Owner = clientHardwareAddress;
this.SendOffer(message, offer);
}
}
private void DhcpRequest(DhcpMessage message)
{
Byte[] addressRequestData = message.GetOptionData(DhcpOption.AddressRequest);
if (addressRequestData == null)
{
addressRequestData = message.ClientAddress;
}
InternetAddress addressRequest = new InternetAddress(addressRequestData);
if (addressRequest.IsEmpty)
{
this.SendNak(message);
return;
}
// Assume we're on an ethernet network
Byte[] hardwareAddressData = new Byte[6];
Array.Copy(message.ClientHardwareAddress, hardwareAddressData, 6);
PhysicalAddress clientHardwareAddress = new PhysicalAddress(hardwareAddressData);
AddressLease assignment = null;
Boolean ack = false;
// If this client is explicitly allowed, or they are not denied and the allow any flag is set
if (this.m_Acl.ContainsKey(clientHardwareAddress) && this.m_Acl[clientHardwareAddress] ||
!this.m_Acl.ContainsKey(clientHardwareAddress) && this.m_AllowAny)
{
if (this.m_Reservations.ContainsKey(clientHardwareAddress))
{
assignment = new AddressLease(clientHardwareAddress, this.m_Reservations[clientHardwareAddress], DateTime.Now.Add(this.m_LeaseDuration));
if (addressRequest.Equals(assignment.Address))
{
ack = true;
}
}
else
{
lock (this.m_LeaseSync)
{
if (this.m_ActiveLeases.ContainsKey(addressRequest) &&
(this.m_ActiveLeases[addressRequest].Owner.Equals(clientHardwareAddress) || this.m_ActiveLeases[addressRequest].SessionId == message.SessionId))
{
assignment = this.m_ActiveLeases[addressRequest];
assignment.Acknowledged = true;
assignment.Owner = clientHardwareAddress;
assignment.Expiration = DateTime.Now.Add(this.m_LeaseDuration);
ack = true;
}
}
}
}
if (ack)
{
this.SendAck(message, assignment);
}
else
{
this.SendNak(message);
}
}
public void Start()
{
Trace.TraceInformation("Dhcp Server Starting...");
this.m_ActiveLeases.Clear();
this.m_InactiveLeases.Clear();
for (InternetAddress address = this.m_StartAddress.Copy(); address.CompareTo(this.m_EndAddress) <= 0; address = address.NextAddress())
{
if ((!address.Equals(this.StartAddress)) && !this.m_Reservations.ContainsValue(address))
{
this.m_InactiveLeases.Add(address, new AddressLease(null, address, DateTime.MinValue));
}
}
if (this.m_DhcpInterfaceAddress == null)
{
if (this.m_DhcpInterface == null)
{
Trace.TraceInformation("Enumerating Network Interfaces.");
foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
{
if (nic.NetworkInterfaceType == NetworkInterfaceType.Loopback)
{
this.m_DhcpInterface = nic;
}
else if ((nic.NetworkInterfaceType == NetworkInterfaceType.Ethernet || nic.NetworkInterfaceType == NetworkInterfaceType.GigabitEthernet || nic.NetworkInterfaceType == NetworkInterfaceType.Wireless80211) && nic.OperationalStatus == OperationalStatus.Up)
{
Trace.TraceInformation("Using Network Interface \"{0}\".", nic.Name);
this.m_DhcpInterface = nic;
break;
}
}
#if TRACE
if (this.m_DhcpInterface.NetworkInterfaceType == NetworkInterfaceType.Loopback)
{
Trace.TraceInformation("Active Ethernet Network Interface Not Found. Using Loopback.");
}
#endif
}
foreach (UnicastIPAddressInformation interfaceAddress in this.m_DhcpInterface.GetIPProperties().UnicastAddresses)
{
if (interfaceAddress.Address.AddressFamily == AddressFamily.InterNetwork)
{
this.m_DhcpInterfaceAddress = interfaceAddress.Address;
}
}
}
if (this.m_DhcpInterfaceAddress == null)
{
Trace.TraceError("Unabled to Set Dhcp Interface Address. Check the networkInterface property of your config file.");
throw new InvalidOperationException("Unabled to Set Dhcp Interface Address.");
}
this.m_Abort = false;
this.m_CleanupTimer = new Timer(new TimerCallback(this.CleanUp), null, 60000, 30000);
this.m_DhcpSocket = configureSocket();
this.Listen();
Trace.TraceInformation("Dhcp Service Started.");
}