public override void PacketHandler(N2HBinaryReader reader)
{
var marker = reader.ReadByte();
if (marker != 0x0b)
{
Logger.FATAL("Marker hand shake wrong:should be 0b and not {0}", marker);
return;
}
var time = reader.ReadUInt16();
var id = reader.ReadByte();
var length = reader.ReadUInt16();
reader.Shrink(length);
var pos = Writer.BaseStream.Position;
Writer.BaseStream.Position += 3;
var idResponse = PerformHandshake(id, reader, pos);
if (idResponse > 0)
{
Writer.BaseStream.Position = pos;
Writer.Write(idResponse);
Writer.Write((short)(Writer.BaseStream.GetAvaliableByteCounts() - 2));
Flush(0x0b);
}
FarId = 0;
}
public static bool ReadCRC(N2HBinaryReader packet)
{
// Check the first 2 CRC bytes
packet.BaseStream.Position = 4;
UInt16 sum = packet.ReadUInt16();
return (sum == CheckSum(packet.BaseStream));
}
public bool PeekUInt16(out ushort word)
{
word = Br.ReadUInt16();
return(SeekBehind(2));
}
public static bool Deserialize(Stream src, out VideoAvc dest)
{
dest = new VideoAvc();
if (src.GetAvaliableByteCounts() < 2)
{
Logger.FATAL("Not enough data");
return false;
}
var reader = new N2HBinaryReader(src);
var _spsLength = reader.ReadUInt16();
if (src.GetAvaliableByteCounts() < _spsLength + 2 + 8)
{
Logger.FATAL("Not enough data");
return false;
}
var psps = reader.ReadBytes(_spsLength);
var _ppsLength = reader.ReadUInt16();
if (src.GetAvaliableByteCounts() < _ppsLength + 2 + 8)
{
Logger.FATAL("Not enough data");
return false;
}
var ppps = reader.ReadBytes(_ppsLength);
dest.Init(psps, ppps);
dest._widthOverride = reader.ReadUInt32();
dest._heightOverride = reader.ReadUInt32();
return true;
}
public override void PacketHandler(N2HBinaryReader reader)
{
if(Checked){
lock (Writer)
{
base.PacketHandler(reader);
}
return;
}
var marker = reader.ReadByte();
if (marker != 0x0b)
{
Logger.FATAL("Marker hand shake wrong:should be 0b and not {0:X}", marker);
return;
}
var time = reader.ReadUInt16();
var type = reader.ReadByte();
var length = reader.ReadUInt16();
byte[] tag;
Logger.Debug("handshake {0:X} len:{1}",type,length);
switch (type)
{
case 0x70:
tag = reader.ReadBytes(reader.ReadByte());
var cookieBytes = reader.ReadBytes(reader.ReadByte());
var targetCertificat = reader.ReadBytes((int)reader.BaseStream.GetAvaliableByteCounts());
var nonce = new byte[0];
_dh = RtmfpUtils.BeginDiffieHellman(ref nonce, true);
Peer.Id = Target.Sha256.ComputeHash(nonce, 0, nonce.Length);
HandShake38(cookieBytes, nonce);
_handshake = () => HandShake38(cookieBytes, nonce);
break;
case 0x71:
tag = reader.ReadBytes(reader.ReadByte());
var flag = reader.ReadByte();
var address = new IPEndPoint(new IPAddress(reader.ReadBytes(4)), reader.ReadInt16());
Target.Address.Port = address.Port;
Logger.Debug("redirect to {0}",address.ToString());
Handler.FarProtocol.IOHandler.Socket.Connect(Target.Address);
_handshake();
break;
case 0x78:
FarId = reader.ReadUInt32();
var targetNonce = reader.ReadBytes((int)reader.Read7BitLongValue());
var must58 = reader.ReadByte();
Debug.WriteLineIf(must58!=0x58,$"must58!{must58}");
var key = new byte[RtmfpUtils.KEY_SIZE];
Buffer.BlockCopy(targetNonce, targetNonce.Length - RtmfpUtils.KEY_SIZE, key, 0, RtmfpUtils.KEY_SIZE);
var sharedSecret = _dh.CreateSharedKey(key);
byte[] decryptKey;
byte[] encryptKey;
RtmfpUtils.ComputeAsymetricKeys(sharedSecret, _certificat, targetNonce, out encryptKey, out decryptKey);
Checked = true;
_handshakeTimeoutTimer.Stop();
AesEncrypt = new AESEngine(encryptKey, AESEngine.Direction.ENCRYPT);
AesDecrypt = new AESEngine(decryptKey);
PrevAesType = AESEngine.AESType.DEFAULT;
Application = Handler.Application;
Handler.CreateSession(Peer, null);
break;
default:
break;
}
}
