private void ProcessRequestRequest(DhcpPacket requestPacket)
{
var responsePacket = CreateResponsePacket(requestPacket);
responsePacket.siaddr = Address;
switch (requestPacket.ClientSystemArchitecture)
{
case DhcpClientSystemArchitecture.ia86Pc: // legacy BIOS
Console.WriteLine("Unsupported client system architecture: {0}", requestPacket.ClientSystemArchitecture);
return;
case DhcpClientSystemArchitecture.EfiIa32: // EFI x86
responsePacket.file = Uefi32FileName;
break;
case DhcpClientSystemArchitecture.EfiBc: // EFI x64
case DhcpClientSystemArchitecture.Efix8664:
responsePacket.file = Uefi64FileName;
break;
default:
Console.WriteLine("Unsupported client system architecture: {0}", requestPacket.ClientSystemArchitecture);
return;
}
SendPacket(DhcpMessageType.DhcpAcknowledge, responsePacket, requestPacket.ciaddr, 4011);
}
private void ProcessDiscoverRequest(DhcpPacket requestPacket)
{
var responsePacket = CreateResponsePacket(requestPacket);
responsePacket.Options.SetString(DhcpPacketOptionId.VendorClassIdentifier, "PXEClient");
SendPacket(DhcpMessageType.DhcpOffer, responsePacket, IPAddress.Broadcast, 68);
}
private DhcpPacket CreateResponsePacket(DhcpPacket requestPacket)
{
Console.WriteLine("{0:X8}: MaximumDhcpMessageSize: {1}", requestPacket.xid, requestPacket.MaximumDhcpMessageSize);
Console.WriteLine("{0:X8}: VendorClassIdentifier: '{1}'", requestPacket.xid, requestPacket.VendorClassIdentifier);
Console.WriteLine("{0:X8}: ClientSystemArchitecture: {1}", requestPacket.xid, requestPacket.ClientSystemArchitecture);
var responsePacket = new DhcpPacket(requestPacket);
responsePacket.op = 2;
responsePacket.sname = "Vurdalakov.PxeServer." + Address.ToString();
responsePacket.Options.Clear();
responsePacket.Options.SetByte(DhcpPacketOptionId.DhcpMessageType, 0);
responsePacket.Options.SetIpAAddress(DhcpPacketOptionId.ServerIdentifier, Address);
return(responsePacket);
}
private void SendPacket(DhcpMessageType dhcpMessageType, DhcpPacket responsePacket, IPAddress address, int port)
{
Console.WriteLine("{0:X8}: Sending packet type {1} to {2}:{3}", responsePacket.xid, dhcpMessageType, address, port);
responsePacket.Options.SetByte(DhcpPacketOptionId.DhcpMessageType, (Byte)dhcpMessageType);
var broadcast = address == IPAddress.Broadcast;
responsePacket.flags = (UInt16)(broadcast ? 0x8000 : 0x0000);
var bytes = responsePacket.ToArray();
DhcpPacket.TraceToFile(bytes);
var endPoint = new IPEndPoint(address, port);
SendData(bytes, endPoint);
Console.WriteLine("{0:X8}: Packet sent", responsePacket.xid);
}
protected override void ProcessRequest(IPEndPoint remoteEndPoint, Byte[] data, int dataLength)
{
DhcpPacket.TraceToFile(data);
var dhcpPacket = new DhcpPacket(data, dataLength);
Console.WriteLine("{0:X8}: *** DHCP packet type {1} received on port {2}", dhcpPacket.xid, dhcpPacket.MessageType, Port);
var vendorClassIdentifier = dhcpPacket.VendorClassIdentifier;
if (String.IsNullOrEmpty(vendorClassIdentifier) || !vendorClassIdentifier.StartsWith("PXEClient"))
{
Console.WriteLine("{0:X8}: Not a BOOTP request", dhcpPacket.xid);
return;
}
PacketReceived(this, dhcpPacket);
switch (dhcpPacket.MessageType)
{
case DhcpMessageType.DhcpDiscover:
ProcessDiscoverRequest(dhcpPacket);
break;
case DhcpMessageType.DhcpRequest:
if (Port != 4011)
{
Console.WriteLine("{0:X8}: Not a BOOTP request", dhcpPacket.xid);
return;
}
ProcessRequestRequest(dhcpPacket);
break;
default:
Console.WriteLine("{0:X8}: Message type not handled", dhcpPacket.xid);
break;
}
}
public DhcpPacket(DhcpPacket dhcpPacket) // for response packet
{
FromArray(dhcpPacket.ToArray());
}
