internal DhcpMessage(byte[] messageData)
{
if (messageData.Length < 244)
{
throw new InvalidDataException("Message is not long enough to be a valid DHCP message.");
}
OpCode = (DhcpOpcode)messageData[0];
HardwareAddressType = (DhcpHardwareType)messageData[1];
HardwareAddressLength = messageData[2];
HardwareOptions = messageData[3];
TransactionID = ReadUInt32(messageData, 4);
SecondsElapsed = ReadUInt16(messageData, 8);
Flags = ReadUInt16(messageData, 10);
ClientIPAddress = ReadIPAddress(messageData, 12);
YourClientIPAddress = ReadIPAddress(messageData, 16);
NextServerIPAddress = ReadIPAddress(messageData, 20);
RelayAgentIPAddress = ReadIPAddress(messageData, 24);
ClientMacAddress = ReadPhysicalAddress(messageData, 28);
ServerHostName = ReadNullTerminatedString(messageData, 44, 64);
BootFileName = ReadNullTerminatedString(messageData, 108, 128);
var magicCookie = ReadIPAddress(messageData, 236);
if (!BootPMagicCookieValue.Equals(magicCookie))
{
throw new InvalidDataException($"Wrong magic cookie value. Expected: {BootPMagicCookieValue}, Received: {magicCookie}");
}
Options = new DhcpOptionCollection(messageData);
}
internal DhcpMessage(DhcpOpcode opCode, DhcpMessageType messageType)
{
OpCode = opCode;
Options = new DhcpOptionCollection(messageType);
}
