public static void TraceToFile(Byte[] data, String fileName = null)
{
#if false // use Wireshark instead
if (String.IsNullOrEmpty(fileName))
{
var directoryName = Path.GetDirectoryName(System.Reflection.Assembly.GetEntryAssembly().Location);
var op = data.Length > 0 ? data[0] : 0;
fileName = String.Format("pkt_{0}_{1}.txt", DateTime.Now.Ticks, 1 == op ? "in" : (2 == op ? "out" : "unknown"));
fileName = Path.Combine(directoryName, fileName);
}
using (var streamWriter = new StreamWriter(fileName, false))
{
using (var reader = new DhcpPacketReader(data))
{
streamWriter.WriteLine("--- packet.length={0}", data.Length);
streamWriter.WriteLine("op={0}", reader.ReadByte());
streamWriter.WriteLine("htype={0}", reader.ReadByte());
streamWriter.WriteLine("hlen={0}", reader.ReadByte());
streamWriter.WriteLine("hops={0}", reader.ReadByte());
streamWriter.WriteLine("xid={0}", reader.ReadUInt32());
streamWriter.WriteLine("secs={0}", reader.ReadUInt16());
streamWriter.WriteLine("flags={0}", reader.ReadUInt16());
streamWriter.WriteLine("ciaddr={0}", reader.ReadIpAddress());
streamWriter.WriteLine("yiaddr={0}", reader.ReadIpAddress());
streamWriter.WriteLine("siaddr={0}", reader.ReadIpAddress());
streamWriter.WriteLine("giaddr={0}", reader.ReadIpAddress());
streamWriter.WriteLine("chaddr={0}", TraceBinary(reader.ReadBytes(16)));
streamWriter.WriteLine("sname={0}", reader.ReadString(64));
streamWriter.WriteLine("file={0}", reader.ReadString(128));
streamWriter.WriteLine("mcookie=0x{0:X8}", reader.ReadUInt32());
while (true)
{
var id = reader.ReadByte();
if ((Byte)DhcpPacketOptionId.Pad == id)
{
streamWriter.WriteLine("ID {0}", id);
continue;
}
else if ((Byte)DhcpPacketOptionId.End == id)
{
streamWriter.WriteLine("ID {0}", id);
break;
}
var length = reader.ReadByte();
streamWriter.WriteLine("ID {0} {1}", id, TraceBinary(reader.ReadBytes(length)));
}
}
}
#endif
}
public void FromArray(Byte[] data, int dataLength = -1)
{
if (dataLength < 0)
{
dataLength = data.Length;
}
if (dataLength < 241)
{
Console.WriteLine("Message is too short: {0} bytes", dataLength); // TODO: throw?
}
Options = new DhcpPacketOptions();
using (var reader = new DhcpPacketReader(data))
{
op = reader.ReadByte();
htype = reader.ReadByte();
hlen = reader.ReadByte();
hops = reader.ReadByte();
xid = reader.ReadUInt32();
secs = reader.ReadUInt16();
flags = reader.ReadUInt16();
ciaddr = reader.ReadIpAddress();
yiaddr = reader.ReadIpAddress();
siaddr = reader.ReadIpAddress();
giaddr = reader.ReadIpAddress();
chaddr = reader.ReadBytes(16);
sname = reader.ReadString(64);
file = reader.ReadString(128);
var magicCookie = reader.ReadUInt32();
if (magicCookie != DhcpMessageMagicCookie)
{
Console.WriteLine("Wrong magic cookie: 0x{0:X8} instead of 0x{1:X8}", magicCookie, DhcpMessageMagicCookie); // TODO: throw?
}
while (true)
{
var id = (DhcpPacketOptionId)reader.ReadByte();
if (DhcpPacketOptionId.Pad == id)
{
continue;
}
else if (DhcpPacketOptionId.End == id)
{
break;
}
var length = reader.ReadByte();
Options.SetBytes(id, reader.ReadBytes(length));
}
}
}
