private DhcpV4Message BuildReleaseMessage(DhcpV4Message ack)
{
DhcpV4Message msg = new DhcpV4Message(null, new IPEndPoint(serverAddr, serverPort));
msg.SetOp((short)DhcpConstants.V4_OP_REQUEST);
msg.SetTransactionId(ack.GetTransactionId());
msg.SetHtype((short)1); // ethernet
msg.SetHlen((byte)6);
msg.SetChAddr(ack.GetChAddr());
msg.SetGiAddr(clientAddr); // look like a relay to the DHCP server
msg.SetCiAddr(ack.GetYiAddr());
DhcpV4MsgTypeOption msgTypeOption = new DhcpV4MsgTypeOption();
msgTypeOption.SetUnsignedByte((short)DhcpConstants.V4MESSAGE_TYPE_RELEASE);
msg.PutDhcpOption(msgTypeOption);
return(msg);
}
private DhcpV4Message BuildRequestMessage(DhcpV4Message offer)
{
DhcpV4Message msg = new DhcpV4Message(IPAddress.Parse("0.0.0.0"), new IPEndPoint(serverAddr, serverPort));
msg.SetOp((short)DhcpConstants.V4_OP_REQUEST);
msg.SetTransactionId(offer.GetTransactionId());
msg.SetHtype((short)1); // ethernet
msg.SetHlen((byte)6);
msg.SetChAddr(offer.GetChAddr());
msg.SetGiAddr(clientAddr); // look like a relay to the DHCP server
DhcpV4MsgTypeOption msgTypeOption = new DhcpV4MsgTypeOption();
msgTypeOption.SetUnsignedByte((short)DhcpConstants.V4MESSAGE_TYPE_REQUEST);
msg.PutDhcpOption(msgTypeOption);
DhcpV4RequestedIpAddressOption reqIpOption = new DhcpV4RequestedIpAddressOption();
reqIpOption.SetIpAddress(offer.GetYiAddr().ToString());
msg.PutDhcpOption(reqIpOption);
return(msg);
}