private static IPv4Packet BuildDhcpRebindMessage(DhcpOffer offer, NetworkInterface inter, ushort packetId, uint dhcpTransactionId)
{
var hardwareAddress = new HardwareAddress(HardwareAddressType.Ethernet,
inter.GetPhysicalAddress().GetAddressBytes());
var dhcpPacket = new DhcpPacket();
dhcpPacket.Operation = DhcpOperation.Request;
dhcpPacket.MessageType = DhcpMessageType.Request;
dhcpPacket.TransactionId = dhcpTransactionId;
dhcpPacket.HardwareAddress = hardwareAddress;
dhcpPacket.ClientAddress = offer.ClientAddress;
dhcpPacket.Options.Add(new DhcpClientIdentifier(hardwareAddress));
var dhcpUdpPacket = new UdpPacket();
dhcpUdpPacket.SourcePort = 68;
dhcpUdpPacket.DestinationPort = 67;
dhcpUdpPacket.Payload = dhcpPacket;
var dhcpIpPacket = new IPv4Packet();
dhcpIpPacket.Source = offer.ClientAddress;
dhcpIpPacket.Destination = offer.DhcpServer;
dhcpIpPacket.Identifiation = packetId;
dhcpIpPacket.Payload = dhcpUdpPacket;
return(dhcpIpPacket);
}
private static IPv4Packet BuildDhcpDiscoverMessage(NetworkInterface inter, ushort packetId, uint dhcpTransactionId)
{
var hardwareAddress = new HardwareAddress(HardwareAddressType.Ethernet,
inter.GetPhysicalAddress().GetAddressBytes());
var dhcpPacket = new DhcpPacket();
dhcpPacket.Operation = DhcpOperation.Request;
dhcpPacket.MessageType = DhcpMessageType.Discover;
dhcpPacket.TransactionId = dhcpTransactionId;
dhcpPacket.HardwareAddress = hardwareAddress;
var dhcpUdpPacket = new UdpPacket();
dhcpUdpPacket.SourcePort = 68;
dhcpUdpPacket.DestinationPort = 67;
dhcpUdpPacket.Payload = dhcpPacket;
var dhcpIpPacket = new IPv4Packet();
dhcpIpPacket.Source = IPAddress.Any;
dhcpIpPacket.Destination = IPAddress.Broadcast;
dhcpIpPacket.Identifiation = packetId;
dhcpIpPacket.Payload = dhcpUdpPacket;
return(dhcpIpPacket);
}
