public DHCPPacket()
{
IPServer = GetCurrentIP();
OperationCode = DHCPOperationCode.ServerToClient;
HardwareType = DHCPHardwareType.Ethernet10;
Flags = 0;
}
public DHCPPacket(byte[] data)
{
DHCPHdr = DecodeBytes(data);
if (DHCPHdr.Magic != 0x63538263)
{
Malformed = true;
return;
}
if (DHCPHdr.MACLength > 16)
{
Malformed = true;
return;
}
for (int i = 0xF0; i < data.Length;)
{
if (data[i] == 0xFF)
{
break;
}
if (data.Length - i < 2)
{
Malformed = true;
break;
}
DHCPOption o = new DHCPOption();
o.Type = data[i + 0];
o.Size = data[i + 1];
if (o.Type == 0 || o.Size == 0)
{
Malformed = true;
break;
}
if (data.Length - (i + o.Size) < 0)
{
Malformed = true;
break;
}
o.Data = new byte[o.Size];
Buffer.BlockCopy(data, i + 2, o.Data, 0, o.Size);
DHCPOptions.Add(o);
i += 2 + o.Size;
}
foreach (DHCPOption o in DHCPOptions)
{
switch (o.Type)
{
case 97:
if (o.Size != 17)
{
Malformed = true;
continue;
}
DHCP97ClientUUID = BytesToString(o.Data, 1);
break;
case 61:
//if (o.Size != 17)
//{
// Malformed = true;
// continue;
//}
DHCP61ClientGUID = BytesToString(o.Data, 1);
break;
case 55:
DHCP9ReqParameterList = new List <byte>();
foreach (byte b in o.Data)
{
if (b == 0 || b == 0xff)
{
Malformed = true;
}
if (DHCP9ReqParameterList.Contains(b) == false)
{
DHCP9ReqParameterList.Add(b);
}
}
break;
case 53:
if (o.Size != 1)
{
Malformed = true;
continue;
}
DHCP53MessageType = (DHCPMessageType)o.Data[0];
break;
case 57:
if (o.Size != 2)
{
Malformed = true;
continue;
}
DHCP57MessageLength = BitConverter.ToUInt16(o.Data.Reverse().ToArray(), 0);
break;
case 60:
if (o.Size != 32)
{
Malformed = true;
continue;
}
DHCP60ClassIdentifier = Encoding.ASCII.GetString(o.Data);
break;
case 66:
DHCP66BootServer = Encoding.ASCII.GetString(o.Data).NullTrim();
break;
case 67:
DHCP67BootFilename = Encoding.ASCII.GetString(o.Data).NullTrim();
break;
case 93:
if (o.Size != 2)
{
Malformed = true;
continue;
}
DHCP93Architecture = (DHCPArchitecture)BitConverter.ToUInt16(o.Data.Reverse().ToArray(), 0);
break;
case 94:
if (o.Size != 3)
{
Malformed = true;
continue;
}
if (o.Data[0] == 1)
{
DHCP94ClientNIC = "UNDI.";
}
else
{
DHCP94ClientNIC = "UNKN.";
}
DHCP94ClientNIC += o.Data[1].ToString("0") + "." + o.Data[2].ToString("0");
break;
default:
Debug.WriteLine("Unknown code: " + o.Type.ToString() + " (0x" + o.Type.ToString("X2") + ")");
break;
}
}
Flags = DHCPHdr.Flags;
OperationCode = DHCPHdr.OperationCode;
HardwareType = DHCPHdr.HardwareType;
XID = DHCPHdr.XID;
IPClient = new IPAddress(DHCPHdr.CIAddr);
IPYours = new IPAddress(DHCPHdr.YIAddr);
IPServer = new IPAddress(DHCPHdr.SIAddr);
IPGateway = new IPAddress(DHCPHdr.GIAddr);
MacAddress = new byte[DHCPHdr.MACLength];
Buffer.BlockCopy(DHCPHdr.CHAddr, 0, MacAddress, 0, DHCPHdr.MACLength);
Servername = Encoding.ASCII.GetString(DHCPHdr.SName).NullTrim();
BootFile = Encoding.ASCII.GetString(DHCPHdr.File).NullTrim();
}
