internal Header(ByteReader br)
{
_transactionID = br.ReadUInt16();
_flags = br.ReadUInt16();
_numQuestions = br.ReadUInt16();
_numAnswers = br.ReadUInt16();
_numAuthorities = br.ReadUInt16();
_numAdditionals = br.ReadUInt16();
}
/// <summary>
/// Initializes a new instance of the <see cref="DhcpMessage"/> class.
/// <param name="data">Array containing the data to decode.</param>
/// </summary>
public DhcpMessage(byte[] data)
{
ByteReader byteReader = new ByteReader(data, ByteOrder.Network);
_timestamp = DateTime.Now;
_op = byteReader.ReadByte();
_htype = byteReader.ReadByte();
_hlen = byteReader.ReadByte();
_hops = byteReader.ReadByte();
_xid = byteReader.ReadUInt32();
_secs = byteReader.ReadUInt16();
_flags = byteReader.ReadBytes(2);
_ciaddr = byteReader.ReadBytes(4);
_yiaddr = byteReader.ReadBytes(4);
_siaddr = byteReader.ReadBytes(4);
_giaddr = byteReader.ReadBytes(4);
_chaddr = byteReader.ReadBytes(16);
_sname = byteReader.ReadBytes(64);
_file = byteReader.ReadBytes(128);
byte[] rawOptions = byteReader.ReadBytes(byteReader.AvailableBytes);
int offset = 0;
// if magic number is valid then process options
if (offset + 4 < rawOptions.Length &&
(BitConverter.ToUInt32(rawOptions, offset) == Constants.DHCP_OPTIONS_MAGIC_NUMBER
|| BitConverter.ToUInt32(rawOptions, offset) == Constants.DHCP_WIN_OPTIONS_MAGIC_NUMBER))
{
offset += 4;
Boolean end = false;
while (!end && offset < rawOptions.Length)
{
DhcpOption option = (DhcpOption)rawOptions[offset];
offset++;
int optionLen;
switch (option)
{
case DhcpOption.Pad:
continue;
case DhcpOption.End:
end = true;
continue;
default:
optionLen = (int)rawOptions[offset];
offset++;
break;
}
byte[] optionData = new byte[optionLen];
Array.Copy(rawOptions, offset, optionData, 0, optionLen);
offset += optionLen;
this._options.Add(option, optionData);
this._optionDataSize += optionLen;
}
}
}