/// <summary>
/// Create a RDPUDP_SOURCE_PAYLOAD_HEADER Structure
/// </summary>
/// <returns></returns>
public RDPUDP_SOURCE_PAYLOAD_HEADER CreateSourcePayloadHeader()
{
RDPUDP_SOURCE_PAYLOAD_HEADER sourceHeader = new RDPUDP_SOURCE_PAYLOAD_HEADER();
Monitor.Enter(sequenceNumberLock);
sourceHeader.snCoded = ++CurSnCoded;
sourceHeader.snSourceStart = ++CurSnSource;
Monitor.Exit(sequenceNumberLock);
return(sourceHeader);
}
public bool RetransmitPacket(RdpeudpPacket packet)
{
if (!connected ||
packet.sourceHeader == null)
{
return(false);
}
if (!outPacketDic.ContainsKey(packet.sourceHeader.Value.snSourceStart))
{
return(false);
}
if (outPacketDic[packet.sourceHeader.Value.snSourceStart].retransmitTimes >= this.SocketConfig.retransmitLimit)
{
//If a datagram has been retransmitted four times without a response, the sender terminates the connection
this.Close();
}
RDPUDP_SOURCE_PAYLOAD_HEADER sourceHeader = packet.sourceHeader.Value;
Monitor.Enter(sequenceNumberLock);
sourceHeader.snCoded = ++CurSnCoded;
Monitor.Exit(sequenceNumberLock);
packet.sourceHeader = sourceHeader;
byte[] data = PduMarshaler.Marshal(packet, false);
SendBytesByUDP(data);
lock (outPacketDic) // Deal with outPacketDic and retransmit packet.
{
if (outPacketDic.ContainsKey(packet.sourceHeader.Value.snSourceStart))
{
outPacketDic[packet.sourceHeader.Value.snSourceStart].retransmitTimes++;
outPacketDic[packet.sourceHeader.Value.snSourceStart].SendTime = DateTime.Now;
}
}
return(true);
}
public override bool Decode(PduMarshaler marshaler)
{
try
{
fecHeader.snSourceAck = marshaler.ReadUInt32();
fecHeader.uReceiveWindowSize = marshaler.ReadUInt16();
fecHeader.uFlags = (RDPUDP_FLAG)marshaler.ReadUInt16();
if (fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_SYN))
{
RDPUDP_SYNDATA_PAYLOAD synData = new RDPUDP_SYNDATA_PAYLOAD();
synData.snInitialSequenceNumber = marshaler.ReadUInt32();
synData.uUpStreamMtu = marshaler.ReadUInt16();
synData.uDownStreamMtu = marshaler.ReadUInt16();
// This datagram MUST be zero-padded to increase the size of this datagram to 1232 bytes.
if (fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_CORRELATION_ID))
{
RDPUDP_CORRELATION_ID_PAYLOAD correlationId = new RDPUDP_CORRELATION_ID_PAYLOAD();
correlationId.uCorrelationId = marshaler.ReadBytes(16);
this.CorrelationId = correlationId;
correlationId.uReserved = marshaler.ReadBytes(16);
}
this.padding = marshaler.ReadToEnd();
this.SynData = synData;
return true;
}
if (fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_ACK))
{
// ACK.
RDPUDP_ACK_VECTOR_HEADER ackVector = new RDPUDP_ACK_VECTOR_HEADER();
ackVector.uAckVectorSize = marshaler.ReadUInt16();
ackVector.AckVectorElement = new AckVector[ackVector.uAckVectorSize];
List<byte> ackVecElementList = new List<byte>(marshaler.ReadBytes(ackVector.AckVectorElement.Length));
ackVecElementList.Reverse();
for (int i = 0; i < ackVector.AckVectorElement.Length; i++)
{
byte vecByte = ackVecElementList[i];
ackVector.AckVectorElement[i].Length = (byte)(0x3F & vecByte);
ackVector.AckVectorElement[i].State = (VECTOR_ELEMENT_STATE)(vecByte >> 6);
}
this.ackVectorHeader = ackVector;
// Padding (variable): A variable-sized array, of length zero or more,
// such that this structure ends on a DWORD ([MS-DTYP] section 2.2.9) boundary.
int padLen = 4 - (2 + ackVector.AckVectorElement.Length) % 4;
if (padLen > 0 && padLen != 4)
{
this.padding = marshaler.ReadBytes(padLen);
}
// Ack of Acks.
if (fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_ACK_OF_ACKS))
{
RDPUDP_ACK_OF_ACKVECTOR_HEADER aoaHeader = new RDPUDP_ACK_OF_ACKVECTOR_HEADER();
aoaHeader.snAckOfAcksSeqNum = marshaler.ReadUInt32();
this.ackOfAckVector = aoaHeader;
}
}
if (fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_DATA))
{
if (!fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_FEC))
{
// Source Data.
RDPUDP_SOURCE_PAYLOAD_HEADER srcHeader = new RDPUDP_SOURCE_PAYLOAD_HEADER();
srcHeader.snCoded = marshaler.ReadUInt32();
srcHeader.snSourceStart = marshaler.ReadUInt32();
this.sourceHeader = srcHeader;
}
else
{
// FEC Data.
RDPUDP_FEC_PAYLOAD_HEADER fecDataHeader = new RDPUDP_FEC_PAYLOAD_HEADER();
fecDataHeader.snCoded = marshaler.ReadUInt32();
fecDataHeader.snSourceStart = marshaler.ReadUInt32();
fecDataHeader.uRange = marshaler.ReadByte();
fecDataHeader.uFecIndex = marshaler.ReadByte();
fecDataHeader.uPadding = marshaler.ReadUInt16();
this.fecPayloadHeader = fecDataHeader;
}
this.payload = marshaler.ReadToEnd();
}
return true;
}
catch
{
return false;
}
}
public override bool Decode(PduMarshaler marshaler)
{
try
{
fecHeader.snSourceAck = marshaler.ReadUInt32();
fecHeader.uReceiveWindowSize = marshaler.ReadUInt16();
fecHeader.uFlags = (RDPUDP_FLAG)marshaler.ReadUInt16();
if (fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_SYN))
{
RDPUDP_SYNDATA_PAYLOAD synData = new RDPUDP_SYNDATA_PAYLOAD();
synData.snInitialSequenceNumber = marshaler.ReadUInt32();
synData.uUpStreamMtu = marshaler.ReadUInt16();
synData.uDownStreamMtu = marshaler.ReadUInt16();
// This datagram MUST be zero-padded to increase the size of this datagram to 1232 bytes.
if (fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_CORRELATION_ID))
{
RDPUDP_CORRELATION_ID_PAYLOAD correlationId = new RDPUDP_CORRELATION_ID_PAYLOAD();
correlationId.uCorrelationId = marshaler.ReadBytes(16);
this.CorrelationId = correlationId;
correlationId.uReserved = marshaler.ReadBytes(16);
}
if (fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_SYNEX))
{
RDPUDP_SYNDATAEX_PAYLOAD synDataEx = new RDPUDP_SYNDATAEX_PAYLOAD();
synDataEx.uSynExFlags = (uSynExFlags_Values)marshaler.ReadUInt16();
synDataEx.uUdpVer = (uUdpVer_Values)marshaler.ReadUInt16();
this.SynDataEx = synDataEx;
}
this.padding = marshaler.ReadToEnd();
this.SynData = synData;
return(true);
}
if (fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_ACK))
{
// ACK.
RDPUDP_ACK_VECTOR_HEADER ackVector = new RDPUDP_ACK_VECTOR_HEADER();
ackVector.uAckVectorSize = marshaler.ReadUInt16();
ackVector.AckVectorElement = new AckVector[ackVector.uAckVectorSize];
List <byte> ackVecElementList = new List <byte>(marshaler.ReadBytes(ackVector.AckVectorElement.Length));
ackVecElementList.Reverse();
for (int i = 0; i < ackVector.AckVectorElement.Length; i++)
{
byte vecByte = ackVecElementList[i];
ackVector.AckVectorElement[i].Length = (byte)(0x3F & vecByte);
ackVector.AckVectorElement[i].State = (VECTOR_ELEMENT_STATE)(vecByte >> 6);
}
this.ackVectorHeader = ackVector;
// Padding (variable): A variable-sized array, of length zero or more,
// such that this structure ends on a DWORD ([MS-DTYP] section 2.2.9) boundary.
int padLen = 4 - (2 + ackVector.AckVectorElement.Length) % 4;
if (padLen > 0 && padLen != 4)
{
this.padding = marshaler.ReadBytes(padLen);
}
// Ack of Acks.
if (fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_ACK_OF_ACKS))
{
RDPUDP_ACK_OF_ACKVECTOR_HEADER aoaHeader = new RDPUDP_ACK_OF_ACKVECTOR_HEADER();
aoaHeader.snAckOfAcksSeqNum = marshaler.ReadUInt32();
this.ackOfAckVector = aoaHeader;
}
}
if (fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_DATA))
{
if (!fecHeader.uFlags.HasFlag(RDPUDP_FLAG.RDPUDP_FLAG_FEC))
{
// Source Data.
RDPUDP_SOURCE_PAYLOAD_HEADER srcHeader = new RDPUDP_SOURCE_PAYLOAD_HEADER();
srcHeader.snCoded = marshaler.ReadUInt32();
srcHeader.snSourceStart = marshaler.ReadUInt32();
this.sourceHeader = srcHeader;
}
else
{
// FEC Data.
RDPUDP_FEC_PAYLOAD_HEADER fecDataHeader = new RDPUDP_FEC_PAYLOAD_HEADER();
fecDataHeader.snCoded = marshaler.ReadUInt32();
fecDataHeader.snSourceStart = marshaler.ReadUInt32();
fecDataHeader.uRange = marshaler.ReadByte();
fecDataHeader.uFecIndex = marshaler.ReadByte();
fecDataHeader.uPadding = marshaler.ReadUInt16();
this.fecPayloadHeader = fecDataHeader;
}
this.payload = marshaler.ReadToEnd();
}
return(true);
}
catch
{
return(false);
}
}
/// <summary>
/// Create a RDPUDP_SOURCE_PAYLOAD_HEADER Structure
/// </summary>
/// <returns></returns>
public RDPUDP_SOURCE_PAYLOAD_HEADER CreateSourcePayloadHeader()
{
RDPUDP_SOURCE_PAYLOAD_HEADER sourceHeader = new RDPUDP_SOURCE_PAYLOAD_HEADER();
Monitor.Enter(sequenceNumberLock);
sourceHeader.snCoded = ++CurSnCoded;
sourceHeader.snSourceStart = ++CurSnSource;
Monitor.Exit(sequenceNumberLock);
return sourceHeader;
}