private void AssembleRequest(ref DHCPRequest DhcpRequest)
{
DhcpRequest.opcode = (byte)DHCPMessageType.DHCPDISCOVER;
DhcpRequest.htype = 1;
DhcpRequest.hlen = 6;
DhcpRequest.hops = 0;
DhcpRequest.secs = 0x0a00;
DhcpRequest.xid = 0xe4b0b618;
DhcpRequest.chaddr = m_byMAC;
DhcpRequest.fill = 0;
DhcpRequest.ciaddr = new byte[4];
DhcpRequest.yiaddr = new byte[4];
DhcpRequest.siaddr = new byte[4];
DhcpRequest.giaddr = new byte[4];
DhcpRequest.sname = new byte[64];
DhcpRequest.file = new byte[128];
DhcpRequest.vend = new byte[130];
int idx = 0;
AddMagicCookie(ref DhcpRequest.vend, ref idx);
AddDHCPMessageType(ref DhcpRequest.vend, ref idx, DHCPMessageType.DHCPREQUEST);
AddMaxDHCPMessageSize(ref DhcpRequest.vend, ref idx);
AddDHCPServerID(ref DhcpRequest.vend, ref idx, m_dwServerID);
AddRequestedIP(ref DhcpRequest.vend, ref idx, m_dwRequestedIP);
AddOptionLeaseTime(ref DhcpRequest.vend, ref idx, m_dwLeaseTime);
AddParameterRequestList(ref DhcpRequest.vend, ref idx);
AddVendorSpecificInfo(ref DhcpRequest.vend, ref idx);
AddVendorClassID(ref DhcpRequest.vend, ref idx);
AddVendorClientID(ref DhcpRequest.vend, ref idx);
}
private void SendRequest()
{
try
{
m_IStatusUpdate.UpdateStatus("Assembling DHCP Request Packet");
DHCPRequest DhcpRequest = new DHCPRequest();
AssembleRequest(ref DhcpRequest);
string destHwAddress = "FFFFFFFFFFFF";
var dest = System.Net.NetworkInformation.PhysicalAddress.Parse(destHwAddress);
EthernetPacket packet = new EthernetPacket(m_Device.Interface.MacAddress, dest, EthernetPacketType.IpV4);
packet.Type = EthernetPacketType.IpV4;
var ipSourceAddress = System.Net.IPAddress.Parse("0.0.0.0");
var ipDestinationAddress = System.Net.IPAddress.Parse("255.255.255.255");
var ipPacket = new IPv4Packet(ipSourceAddress, ipDestinationAddress);
UdpPacket udpPacket = new UdpPacket(67, 68);
byte[] payload = StructureToByteArray(DhcpRequest);
ipPacket.Version = IpVersion.IPv4;
udpPacket.PayloadData = payload;
ipPacket.PayloadPacket = udpPacket;
packet.PayloadPacket = ipPacket;
udpPacket.UpdateUDPChecksum();
ipPacket.UpdateIPChecksum();
m_IStatusUpdate.UpdateStatus("Sending DHCP Discover");
m_Device.SendPacket(packet);
m_IStatusUpdate.UpdateStatus("Sent DHCP Discover");
}
catch (Exception)
{
m_IStatusUpdate.UpdateStatus("Failed to send DHCP Request");
}
}