public static byte[] GetHandshakeResponse(ByteBuffer input)
{
int position = (int)input.Position;
if (input[position + 4] == 0)
{
//Using old style handshake
byte[] output = new byte[2 * RtmpProtocolDecoder.HandshakeSize + 1];
output[0] = 0x03;
int tick = System.Environment.TickCount;
output[1] = (byte)((tick >> 24) & 0xff);
output[2] = (byte)((tick >> 16) & 0xff);
output[3] = (byte)((tick >> 8) & 0xff);
output[4] = (byte)(tick & 0xff);
HandshakePadBytes.CopyTo(output, 5);
input.Read(output, RtmpProtocolDecoder.HandshakeSize + 1, RtmpProtocolDecoder.HandshakeSize);
return output;
}
else
{
//This method is broken by FP 10.0.32.18
//int index = (input[8] + input[9] + input[10] + input[11]) % 728 + 12;
int index = 0;
if (input[position + 5] == 0 && input[position + 6] == 3 && input[position + 7] == 2)
index = ((input[position + 772] & 0x0ff) + (input[position + 773] & 0x0ff) + (input[position + 774] & 0x0ff) + (input[position + 775] & 0x0ff)) % 728 + 776;
else
index = ((input[position + 8] & 0x0ff) + (input[position + 9] & 0x0ff) + (input[position + 10] & 0x0ff) + (input[position + 11] & 0x0ff)) % 728 + 12;
byte[] part = new byte[32];
for (int i = 0; i < 32; ++i)
{
part[i] = input[position + index + i];
}
HMACSHA256 hmacsha256 = new HMACSHA256();
hmacsha256.Key = SecretKey;
byte[] newKey = hmacsha256.ComputeHash(part);
byte[] randBytes = new byte[RtmpProtocolDecoder.HandshakeSize - 32];
Random random = new Random();
random.NextBytes(randBytes);
hmacsha256.Key = newKey;
byte[] hashedBytes = hmacsha256.ComputeHash(randBytes);
byte[] output = new byte[2 * RtmpProtocolDecoder.HandshakeSize + 1];
output[0] = 0x03;
HandshakeServerBytes.CopyTo(output, 1);
//randBytes.CopyTo(output, RtmpProtocolDecoder.HandshakeSize + 1);
randBytes.CopyTo(output, 1 + HandshakeServerBytes.Length);
//hashedBytes.CopyTo(output, RtmpProtocolDecoder.HandshakeSize + 1 + randBytes.Length);
hashedBytes.CopyTo(output, 1 + HandshakeServerBytes.Length + randBytes.Length);
input.Skip(RtmpProtocolDecoder.HandshakeSize);
return output;
}
}
static ISharedObjectMessage DecodeFlexSharedObject(ByteBuffer stream)
{
// Unknown byte, always 0?
stream.Skip(1);
RtmpReader reader = new RtmpReader(stream);
string name = reader.ReadString();
// Read version of SO to modify
int version = reader.ReadInt32();
// Read persistence informations
bool persistent = reader.ReadInt32() == 2;
// Skip unknown bytes
reader.ReadInt32();
SharedObjectMessage so = new FlexSharedObjectMessage(null, name, version, persistent);
DecodeSharedObject(so, stream, reader);
return so;
}
static void EncodeSharedObject(RtmpContext context, ISharedObjectMessage so, ByteBuffer output)
{
RtmpWriter writer = new RtmpWriter(output);
//Set legacy collection flag from context
writer.UseLegacyCollection = context.UseLegacyCollection;
writer.UseLegacyThrowable = context.UseLegacyThrowable;
writer.WriteUTF(so.Name);
// SO version
writer.WriteInt32(so.Version);
// Encoding (this always seems to be 2 for persistent shared objects)
writer.WriteInt32(so.IsPersistent ? 2 : 0);
// unknown field
writer.WriteInt32(0);
int mark, len = 0;
foreach(ISharedObjectEvent sharedObjectEvent in so.Events)
{
byte type = SharedObjectTypeMapping.ToByte(sharedObjectEvent.Type);
switch(sharedObjectEvent.Type)
{
case SharedObjectEventType.SERVER_CONNECT:
case SharedObjectEventType.CLIENT_INITIAL_DATA:
case SharedObjectEventType.CLIENT_CLEAR_DATA:
writer.WriteByte(type);
writer.WriteInt32(0);
break;
case SharedObjectEventType.SERVER_DELETE_ATTRIBUTE:
case SharedObjectEventType.CLIENT_DELETE_DATA:
case SharedObjectEventType.CLIENT_UPDATE_ATTRIBUTE:
writer.WriteByte(type);
mark = (int)output.Position;
output.Skip(4); // we will be back
writer.WriteUTF(sharedObjectEvent.Key);
len = (int)output.Position - mark - 4;
output.PutInt(mark, len);
break;
case SharedObjectEventType.SERVER_SET_ATTRIBUTE:
case SharedObjectEventType.CLIENT_UPDATE_DATA:
if (sharedObjectEvent.Key == null)
{
// Update multiple attributes in one request
IDictionary initialData = sharedObjectEvent.Value as IDictionary;
foreach(DictionaryEntry entry in initialData)
{
writer.WriteByte(type);
mark = (int)output.Position;
output.Skip(4); // we will be back
string key = entry.Key as string;
object value = entry.Value;
writer.WriteUTF(key);
writer.WriteData(context.ObjectEncoding, value);
len = (int)output.Position - mark - 4;
output.PutInt(mark, len);
}
}
else
{
writer.WriteByte(type);
mark = (int)output.Position;
output.Skip(4); // we will be back
writer.WriteUTF(sharedObjectEvent.Key);
writer.WriteData(context.ObjectEncoding, sharedObjectEvent.Value);
//writer.WriteData(sharedObjectEvent.Value);
len = (int)output.Position - mark - 4;
output.PutInt(mark, len);
}
break;
case SharedObjectEventType.CLIENT_SEND_MESSAGE:
case SharedObjectEventType.SERVER_SEND_MESSAGE:
// Send method name and value
writer.WriteByte(type);
mark = (int)output.Position;
output.Skip(4); // we will be back
// Serialize name of the handler to call
writer.WriteData(context.ObjectEncoding, sharedObjectEvent.Key);
//writer.WriteUTF(sharedObjectEvent.Key);
// Serialize the arguments
foreach(object arg in sharedObjectEvent.Value as IList)
{
writer.WriteData(context.ObjectEncoding, arg);
}
//writer.WriteData(sharedObjectEvent.Value as IList);
len = (int)output.Position - mark - 4;
//output.PutInt(mark, len);
output.PutInt(mark, len);
break;
case SharedObjectEventType.CLIENT_STATUS:
writer.WriteByte(type);
mark = (int)output.Position;
output.Skip(4); // we will be back
writer.WriteUTF(sharedObjectEvent.Key);
writer.WriteUTF(sharedObjectEvent.Value as string);
len = (int)output.Position - mark - 4;
output.PutInt(mark, len);
break;
case SharedObjectEventType.SERVER_DISCONNECT:
writer.WriteByte(type);
output.PutInt((int)output.Position, 0);
break;
default:
#if !SILVERLIGHT
_log.Error("Unknown event " + sharedObjectEvent.Type.ToString());
#endif
writer.WriteByte(type);
mark = (int)output.Position;
output.Skip(4); // we will be back
if (sharedObjectEvent.Key != null)
{
writer.WriteUTF(sharedObjectEvent.Key);
writer.WriteData(context.ObjectEncoding, sharedObjectEvent.Value);
}
len = (int)output.Position - mark - 4;
output.PutInt(mark, len);
break;
}
}
}
/// <summary>
/// Decodes handshake message.
/// </summary>
/// <param name="context">RTMP protocol state.</param>
/// <param name="stream">Buffer to be decoded.</param>
/// <returns>Buffer with handshake response.</returns>
public static object DecodeHandshake(RtmpContext context, ByteBuffer stream)
{
long remaining = stream.Remaining;
if(context.Mode == RtmpMode.Server)
{
if(context.State == RtmpState.Connect)
{
if(remaining < HandshakeSize + 1)
{
#if !SILVERLIGHT
if( log.IsDebugEnabled )
log.Debug(__Res.GetString(__Res.Rtmp_HSInitBuffering, remaining));
#endif
context.SetBufferDecoding(HandshakeSize + 1);
return null;
}
else
{
#if !SILVERLIGHT
if (log.IsDebugEnabled)
log.Debug("Handshake 1st phase");
#endif
stream.Get();// skip the header byte
byte[] handshake = RtmpHandshake.GetHandshakeResponse(stream);
context.SetHandshake(handshake);
context.State = RtmpState.Handshake;
return handshake;
}
}
if(context.State == RtmpState.Handshake)
{
//if (log.IsDebugEnabled)
// log.Debug("Handshake reply");
if(remaining < HandshakeSize)
{
#if !SILVERLIGHT
if( log.IsDebugEnabled )
log.Debug(__Res.GetString(__Res.Rtmp_HSReplyBuffering, remaining));
#endif
context.SetBufferDecoding(HandshakeSize);
return null;
}
else
{
// Skip first 8 bytes when comparing the handshake, they seem to be changed when connecting from a Mac client.
if (!context.ValidateHandshakeReply(stream, 8, HandshakeSize - 8))
{
#if !SILVERLIGHT
if (log.IsDebugEnabled)
log.Debug("Handshake reply validation failed, disconnecting client.");
#endif
stream.Skip(HandshakeSize);
context.State = RtmpState.Error;
throw new HandshakeFailedException("Handshake validation failed");
}
stream.Skip(HandshakeSize);
context.State = RtmpState.Connected;
context.ContinueDecoding();
return null;
}
}
}
else
{
//Client mode
if(context.State == RtmpState.Connect)
{
int size = (2 * HandshakeSize) + 1;
if(remaining < size)
{
#if !SILVERLIGHT
if( log.IsDebugEnabled )
log.Debug(__Res.GetString(__Res.Rtmp_HSInitBuffering, remaining));
#endif
context.SetBufferDecoding(size);
return null;
}
else
{
ByteBuffer hs = ByteBuffer.Allocate(size);
ByteBuffer.Put(hs, stream, size);
hs.Flip();
context.State = RtmpState.Handshake;
return hs;
}
}
}
return null;
}
