public byte[] this[DHCPOptionEnum optype]
{
get {
byte[] ret = null;
foreach (DHCPOption op in Options)
{
if (op.Type == optype)
{
ret = op.Value;
break;
}
}
return(ret);
}
set {
for (int x = 0; x < Options.Count; x++)
{
if (Options[x].Type == optype)
{
_options.RemoveAt(x);
break;
}
}
if (value != null)
{
_options.Add(new DHCPOption(optype, value));
}
}
}
internal DHCPOption(byte[] data)
{
BinaryReader br = new BinaryReader(new MemoryStream(data));
_type = (DHCPOptionEnum)br.ReadByte();
_value = br.ReadBytes((int)br.ReadByte());
}
//create an option message
//shall always append at the end of the message
private void CreateOptionElement(DHCPOptionEnum Code, byte[] DataToAdd, ref byte[] AddtoMe)
{
byte[] tOption;
try
{
tOption = new byte[DataToAdd.Length + 2];
//add the code, and data length
tOption[0] = (byte)Code;
tOption[1] = (byte)DataToAdd.Length;
//add the code to put in
Array.Copy(DataToAdd, 0, tOption, 2, DataToAdd.Length);
//copy the data to the out array
if (AddtoMe == null)
{
Array.Resize(ref AddtoMe, (int)tOption.Length);
}
else
{
Array.Resize(ref AddtoMe, AddtoMe.Length + tOption.Length);
}
Array.Copy(tOption, 0, AddtoMe, AddtoMe.Length - tOption.Length, tOption.Length);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
//pass the option type that you require
//parse the option data
//return the data in a byte of what we need
private byte[] GetOptionData(DHCPOptionEnum DHCPTyp, cDHCPStruct cdDHCPs)
{
int DHCPId = 0;
byte DDataID, DataLength = 0;
byte[] dumpData;
try
{
DHCPId = (int)DHCPTyp;
//loop through look for the bit that states that the identifier is there
for (int i = 0; i < cdDHCPs.dStruct.D_options.Length; i++)
{
//at the start we have the code + length
//i has the code, i+1 = length of data, i+1+n = data skip
DDataID = cdDHCPs.dStruct.D_options[i];
if (DDataID == DHCPId)
{
DataLength = cdDHCPs.dStruct.D_options[i + 1];
dumpData = new byte[DataLength];
Array.Copy(cdDHCPs.dStruct.D_options, i + 2, dumpData, 0, DataLength);
return(dumpData);
}
else
{
DataLength = cdDHCPs.dStruct.D_options[i + 1]; //'length of code
i += 1 + DataLength;
} //.endif
} //for
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
dumpData = null;
}
return(null);
}
public DHCPOption(DHCPOptionEnum type, byte[] value)
{
_type = type;
_value = value;
}
public byte[] this[DHCPOptionEnum optype]
{
get {
byte[] ret = null;
foreach (DHCPOption op in Options)
{
if (op.Type == optype)
{
ret = op.Value;
break;
}
}
return ret;
}
set {
for (int x = 0; x < Options.Count;x++ )
{
if (Options[x].Type == optype)
{
_options.RemoveAt(x);
break;
}
}
if (value!=null)
_options.Add(new DHCPOption(optype, value));
}
}
internal DHCPOption(byte[] data)
{
BinaryReader br = new BinaryReader(new MemoryStream(data));
_type = (DHCPOptionEnum)br.ReadByte();
_value = br.ReadBytes((int)br.ReadByte());
}
public DHCPOption(DHCPOptionEnum type, byte[] value)
{
_type = type;
_value = value;
}