public override void reciever(IPEndPoint from, byte[] data)
{
Dahua1Section1 section1;
int section1Len;
byte section2Len;
UInt16 section3Len;
int deviceMacSize;
UInt32 deviceIPv4;
string deviceModel, deviceSerial, deviceIPv6;
byte[] deviceTypeArray, deviceMacArray;
byte[] section3Array;
int index;
section1Len = Marshal.SizeOf(typeof(Dahua1Section1));
deviceMacSize = 17; // "00:11:22:33:44:55".Length()
// section 1:
if (data.Length < Marshal.SizeOf(typeof(Dahua1Section1)))
{
Logger.getInstance().WriteLine(Logger.DebugLevel.Warn, String.Format("Warning: Dahua1.reciever(): Invalid packet size (less than section1) from {0}", from.ToString()));
return;
}
section1 = data.GetStruct <Dahua1Section1>();
if (section1.headerMagic != answerMagic)
{
Logger.getInstance().WriteLine(Logger.DebugLevel.Warn, String.Format("Warning: Dahua1.reciever(): Wrong header magic recieved from {0}", from.ToString()));
return;
}
// IP Address
deviceIPv4 = NetworkUtils.littleEndian32(section1.ip);
// device type
deviceModel = Encoding.UTF8.GetString(section1.deviceType);
section2Len = section1.section2Len;
section3Len = NetworkUtils.littleEndian16(section1.section3Len);
if (section1Len + section2Len + section3Len != data.Length)
{
Logger.getInstance().WriteLine(Logger.DebugLevel.Warn, String.Format("Warning: Dahua1.reciever(): Packet has wrong size = {0} (expected was {1})", data.Length, section1Len + section2Len + section3Len));
return;
}
// section 2:
// mac Address
deviceMacSize = Math.Min(deviceMacSize, section2Len);
deviceMacArray = new byte[deviceMacSize];
index = typeof(Dahua1Section1).StructLayoutAttribute.Size;
Array.Copy(data, index, deviceMacArray, 0, deviceMacSize);
index += deviceMacArray.Length;
deviceSerial = Encoding.UTF8.GetString(deviceMacArray);
// we still have more data in section 2
if (section2Len > deviceMacSize)
{
// if deviceType from section2, replace deviceType with this one
deviceTypeArray = new byte[section2Len - deviceMacSize];
Array.Copy(data, index, deviceTypeArray, 0, deviceTypeArray.Length);
index += deviceTypeArray.Length;
deviceModel = Encoding.UTF8.GetString(deviceTypeArray);
}
// section 3:
deviceIPv6 = null;
if (section3Len > 0)
{
Dictionary <string, string> values;
section3Array = new byte[section3Len];
Array.Copy(data, index, section3Array, 0, section3Array.Length);
index += section3Array.Length;
values = parseSection3(section3Array);
if (values.ContainsKey("SerialNo"))
{
deviceSerial = values["SerialNo"];
}
if (values.ContainsKey("IPv6Addr"))
{
deviceIPv6 = values["IPv6Addr"];
if (deviceIPv6.Contains(';'))
{
var IPv6Split = deviceIPv6.Split(';');
deviceIPv6 = IPv6Split[0];
}
if (deviceIPv6.Contains('/'))
{
var IPv6Split = deviceIPv6.Split('/');
deviceIPv6 = IPv6Split[0];
}
}
}
if (deviceIPv4 != 0)
{
viewer.deviceFound(name, 1, new IPAddress(deviceIPv4), deviceModel, deviceSerial);
}
else
{
viewer.deviceFound(name, 1, from.Address, deviceModel, deviceSerial);
Logger.getInstance().WriteLine(Logger.DebugLevel.Warn, String.Format("Warning: Dahua1.reciever(): Recieved ipv4 is null (from: {0})", from.Address.ToString()));
}
if (deviceIPv6 != null)
{
IPAddress ip;
if (IPAddress.TryParse(deviceIPv6, out ip))
{
viewer.deviceFound(name, 2, ip, deviceModel, deviceSerial);
}
else
{
Logger.getInstance().WriteLine(Logger.DebugLevel.Warn, String.Format("Warning: Dahua1.reciever(): Invalid ipv6 format: {0}", deviceIPv6));
}
}
}
