public static MessagePartPacket Decode(byte[] udpData)
{
var r = new MessagePartPacket();
r.DecodedUdpData = udpData;
var reader = PacketProcedures.CreateBinaryReader(udpData, 1);
r.MessageId32 = reader.ReadUInt32();
r.SenderStatus = (MessageSessionStatusCode)reader.ReadByte();
var flags = reader.ReadByte();
if ((flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
if (r.SenderStatus == MessageSessionStatusCode.inProgress)
{
r.ContinuedEncryptedData = PacketProcedures.DecodeByteArray65536(reader);
}
else if (r.SenderStatus == MessageSessionStatusCode.encryptionDecryptionCompleted)
{
r.SenderSignature = UserCertificateSignature.Decode(reader);
}
r.MessageHMAC = HMAC.Decode(reader);
return(r);
}
/// <summary>
/// decodes the packet, verifies match to REQ
/// </summary>
/// <param name="reader">is positioned after first byte = packet type</param>
public static FailurePacket DecodeAndOptionallyVerify(byte[] failureUdpData, RequestP2pSequenceNumber16 reqP2pSeq16)
{
var reader = PacketProcedures.CreateBinaryReader(failureUdpData, 1);
var failure = new FailurePacket();
failure.DecodedUdpPayloadData = failureUdpData;
failure.Flags = reader.ReadByte();
if ((failure.Flags & Flag_EPtoA) == 0)
{
failure.NeighborToken32 = NeighborToken32.Decode(reader);
}
if ((failure.Flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
failure.ReqP2pSeq16 = RequestP2pSequenceNumber16.Decode(reader);
failure.AssertMatchToReq(reqP2pSeq16);
failure.ResponseCode = (ResponseOrFailureCode)reader.ReadByte();
if ((failure.Flags & Flag_EPtoA) == 0)
{
failure.NeighborHMAC = HMAC.Decode(reader);
}
return(failure);
}
public PeerHelloPacket(byte[] packetUdpPayloadData)
{
// if (packetUdpPayloadData.Length < MinEncodedSize) throw new ArgumentException(nameof(packetUdpPayloadData));
var index = P2ptpCommon.HeaderSize;
FromPeerId = PeerId.Decode(packetUdpPayloadData, ref index);
StreamId = StreamId.Decode(packetUdpPayloadData, ref index);
ToPeerId = PeerId.Decode(packetUdpPayloadData, ref index);
LibraryVersion = PacketProcedures.DecodeUInt32(packetUdpPayloadData, ref index);
ProtocolVersion = PacketProcedures.DecodeUInt16(packetUdpPayloadData, ref index);
Status = (PeerHelloRequestStatus)packetUdpPayloadData[index++];
RequestTime32 = PacketProcedures.DecodeUInt32(packetUdpPayloadData, ref index);
Flags = packetUdpPayloadData[index++];
var extensionIdsLength = packetUdpPayloadData[index++];
ExtensionIds = new string[extensionIdsLength];
for (byte i = 0; i < extensionIdsLength; i++)
{
ExtensionIds[i] = PacketProcedures.DecodeString1ASCII(packetUdpPayloadData, ref index);
}
if (index < packetUdpPayloadData.Length)
{ // after version 190608
RequestSequenceNumber = PacketProcedures.DecodeUInt16(packetUdpPayloadData, ref index);
ResponseCpuDelayMs = PacketProcedures.DecodeUInt16(packetUdpPayloadData, ref index);
RequestedFromIp = PacketProcedures.DecodeString1ASCII(packetUdpPayloadData, ref index);
var reader = PacketProcedures.CreateBinaryReader(packetUdpPayloadData, index);
if (FlagIshareMyIpLocation)
{
IpLocationData = IpLocationData.Decode(reader);
}
}
}
public static InviteRequestPacket Decode_VerifyNeighborHMAC(byte[] udpData, ConnectionToNeighbor receivedFromNeighbor)
{
var r = new InviteRequestPacket();
r.DecodedUdpPayloadData = udpData;
var reader = PacketProcedures.CreateBinaryReader(udpData, 1);
var flags = reader.ReadByte();
if ((flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
r.NeighborToken32 = NeighborToken32.Decode(reader);
if (receivedFromNeighbor.LocalNeighborToken32.Equals(r.NeighborToken32) == false)
{
throw new UnmatchedFieldsException();
}
r.ReqTimestamp32S = reader.ReadUInt32();
r.RequesterRegistrationId = RegistrationId.Decode(reader);
r.ResponderRegistrationId = RegistrationId.Decode(reader);
r.RequesterEcdhePublicKey = EcdhPublicKey.Decode(reader);
r.RequesterRegistrationSignature = RegistrationSignature.Decode(reader);
r.NumberOfHopsRemaining = reader.ReadByte();
r.ReqP2pSeq16 = RequestP2pSequenceNumber16.Decode(reader);
r.NeighborHMAC = HMAC.Decode(reader);
if (r.NeighborHMAC.Equals(receivedFromNeighbor.GetNeighborHMAC(r.GetSignedFieldsForNeighborHMAC)) == false)
{
throw new BadSignatureException("invalid INVITE REQ NeighborHMAC 5902");
}
return(r);
}
public static InviteConfirmationPacket Decode(byte[] udpData)
{
var r = new InviteConfirmationPacket();
r.DecodedUdpPayloadData = udpData;
var reader = PacketProcedures.CreateBinaryReader(udpData, 1);
var flags = reader.ReadByte();
if ((flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
r.NeighborToken32 = NeighborToken32.Decode(reader);
r.ReqTimestamp32S = reader.ReadUInt32();
r.RequesterRegistrationId = RegistrationId.Decode(reader);
r.ResponderRegistrationId = RegistrationId.Decode(reader);
r.ResponderRegistrationSignature = RegistrationSignature.Decode(reader);
r.ReqP2pSeq16 = RequestP2pSequenceNumber16.Decode(reader);
r.NeighborHMAC = HMAC.Decode(reader);
return(r);
}
/// <param name="reader">positioned after first byte = packet type</param>
public RegisterPow1RequestPacket(byte[] originalPacketUdpPayload)
{
var reader = PacketProcedures.CreateBinaryReader(originalPacketUdpPayload, 1);
Flags = reader.ReadByte();
if ((Flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
Timestamp32S = reader.ReadUInt32();
ProofOfWork1 = reader.ReadBytes(64);
Pow1RequestId = reader.ReadUInt32();
}
public ServerHelloPacket0(byte[] udpData)
{
var reader = PacketProcedures.CreateBinaryReader(udpData, 1);
Flags = reader.ReadUInt16();
Status = (ServerHello0Status)reader.ReadByte();
Cnonce0 = PacketProcedures.DecodeByteArray256(reader);
if (Status == ServerHello0Status.OK)
{
StatefulProofOfWorkType = (StatefulProofOfWorkType)reader.ReadByte();
Snonce0 = PacketProcedures.DecodeByteArray256(reader);
}
}
public static RegisterConfirmationPacket DecodeAndOptionallyVerify(byte[] regCfmUdpPayload, RegisterRequestPacket reqNullable, ConnectionToNeighbor newConnectionToRequesterAtResponderNullable)
{
var reader = PacketProcedures.CreateBinaryReader(regCfmUdpPayload, 1);
var cfm = new RegisterConfirmationPacket();
cfm.DecodedUdpPayloadData = regCfmUdpPayload;
cfm.Flags = reader.ReadByte();
if ((cfm.Flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
if ((cfm.Flags & Flag_AtoEP) == 0)
{
cfm.NeighborToken32 = NeighborToken32.Decode(reader);
}
cfm.ReqTimestamp64 = reader.ReadInt64();
cfm.RequesterRegistrationId = RegistrationId.Decode(reader);
if (reqNullable != null)
{
cfm.AssertMatchToRegisterReq(reqNullable);
}
if (newConnectionToRequesterAtResponderNullable != null)
{
cfm.ResponderRegistrationConfirmationSignature = RegistrationSignature.DecodeAndVerify(reader, newConnectionToRequesterAtResponderNullable.Engine.CryptoLibrary,
w => newConnectionToRequesterAtResponderNullable.GetResponderRegistrationConfirmationSignatureFields(w),
newConnectionToRequesterAtResponderNullable.LocalDrpPeer.Configuration.LocalPeerRegistrationId
);
cfm.RequesterRegistrationConfirmationSignature = RegistrationSignature.DecodeAndVerify(reader, newConnectionToRequesterAtResponderNullable.Engine.CryptoLibrary,
w => newConnectionToRequesterAtResponderNullable.GetRequesterRegistrationConfirmationSignatureFields(w, cfm.ResponderRegistrationConfirmationSignature),
newConnectionToRequesterAtResponderNullable.RemoteRegistrationId
);
}
else
{
cfm.ResponderRegistrationConfirmationSignature = RegistrationSignature.Decode(reader);
cfm.RequesterRegistrationConfirmationSignature = RegistrationSignature.Decode(reader);
}
cfm.ReqP2pSeq16 = RequestP2pSequenceNumber16.Decode(reader);
if ((cfm.Flags & Flag_AtoEP) == 0)
{
cfm.NeighborHMAC = HMAC.Decode(reader);
}
return(cfm);
}
public static NatTest1RequestPacket Decode(byte[] udpData)
{
var r = new NatTest1RequestPacket();
var reader = PacketProcedures.CreateBinaryReader(udpData, 1);
var flags = reader.ReadByte();
if ((flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
r.Token32 = reader.ReadUInt32();
return(r);
}
public RegisterPow1ResponsePacket(byte[] rpPow1ResponsePacketData)
{
var reader = PacketProcedures.CreateBinaryReader(rpPow1ResponsePacketData, 1);
Pow1RequestId = reader.ReadUInt32();
Flags = reader.ReadByte();
if ((Flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
StatusCode = (RegisterPow1ResponseStatusCode)reader.ReadByte();
if (StatusCode == RegisterPow1ResponseStatusCode.succeeded_Pow2Challenge)
{
ProofOfWork2Request = reader.ReadBytes(16);
}
}
/// <returns>true if there are more packets in queue, and need to call this procedure again</returns>
bool PacketProcessorThreadProcedure()
{
ReceivedPacket p;
lock (_packetsToProcess)
{
if (_packetsToProcess.Count == 0)
{
return(false);
}
p = _packetsToProcess.Dequeue();
}
try
{
var reader = PacketProcedures.CreateBinaryReader(p.Data, 0);
var packetType = (CcpPacketType)reader.ReadByte();
switch (packetType)
{
case CcpPacketType.ClientHelloPacket0:
ProcessClientHello0(p.ClientEndpoint, reader, p.Data);
break;
case CcpPacketType.ClientHelloPacket1:
ProcessClientHello1(p.ClientEndpoint, reader, p.Data);
break;
default:
HandleMalformedPacket(p.ClientEndpoint);
break;
}
}
catch (Exception exc)
{
HandleExceptionInPacketProcessorThread(exc);
HandleMalformedPacket(p.ClientEndpoint);
if (_config.RespondErrors)
{
RespondToHello0(p.ClientEndpoint, ServerHello0Status.ErrorBadPacket, null);
}
}
return(true);
}
/// <param name="receivedFromUser">comes from local contact book</param>
internal static InviteSessionDescription Decrypt_Verify(ICryptoLibrary cryptoLibrary, byte[] encryptedSdData,
InviteRequestPacket req,
InviteAck1Packet ack1,
bool ack1SdIsReady,
InviteSession session,
UserId receivedFromUser,
DateTime localTimeNowUtc
)
{
#region key, iv
PacketProcedures.CreateBinaryWriter(out var ms2, out var w2);
req.GetSharedSignedFields(w2);
ack1.GetSharedSignedFields(w2, ack1SdIsReady);
var iv = cryptoLibrary.GetHashSHA256(ms2.ToArray()).Take(16).ToArray();
ms2.Write(session.SharedInviteAckDhSecret, 0, session.SharedInviteAckDhSecret.Length);
var aesKey = cryptoLibrary.GetHashSHA256(ms2.ToArray()); // here SHA256 is used as KDF, together with common fields from packets, including both ECDH public keys and timestamp
#endregion
// decrypt
var plainTextSdData = new byte[encryptedSdData.Length];
cryptoLibrary.ProcessAesCbcBlocks(false, aesKey, iv, encryptedSdData, plainTextSdData);
var r = new InviteSessionDescription();
var reader = PacketProcedures.CreateBinaryReader(plainTextSdData, 0);
r.Flags = reader.ReadByte();
if ((r.Flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
r.UserCertificate = UserCertificate.Decode_AssertIsValidNow(reader, cryptoLibrary, receivedFromUser, localTimeNowUtc);
r.DirectChannelEndPoint = PacketProcedures.DecodeIPEndPoint(reader);
r.DirectChannelToken32 = DirectChannelToken32.Decode(reader);
r.SessionType = (SessionType)reader.ReadByte();
r.UserCertificateSignature = UserCertificateSignature.DecodeAndVerify(reader, cryptoLibrary,
w =>
{
req.GetSharedSignedFields(w);
ack1.GetSharedSignedFields(w, ack1SdIsReady);
r.WriteSignedFields(w);
},
r.UserCertificate);
return(r);
}
public NeighborPeerAckPacket(byte[] nextHopResponsePacketData)
{
var reader = PacketProcedures.CreateBinaryReader(nextHopResponsePacketData, 1);
ReqP2pSeq16 = RequestP2pSequenceNumber16.Decode(reader);
var flags = reader.ReadByte();
if ((flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
if ((flags & Flag_EPtoA) == 0)
{
NeighborToken32 = NeighborToken32.Decode(reader);
}
ResponseCode = (ResponseOrFailureCode)reader.ReadByte();
if ((flags & Flag_EPtoA) == 0)
{
NeighborHMAC = HMAC.Decode(reader);
}
}
public static MessageStartPacket Decode(byte[] udpData)
{
var r = new MessageStartPacket();
r.DecodedUdpData = udpData;
var reader = PacketProcedures.CreateBinaryReader(udpData, 1);
r.DirectChannelToken32 = DirectChannelToken32.Decode(reader);
r.MessageId32 = reader.ReadUInt32();
var flags = reader.ReadByte();
if ((flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
r.MessageTimestamp64 = reader.ReadInt64();
r.EncryptedMessageData = PacketProcedures.DecodeByteArray65536(reader);
r.MessageHMAC = HMAC.Decode(reader);
return(r);
}
public static MessageAckPacket Decode(byte[] udpData)
{
var r = new MessageAckPacket();
var reader = PacketProcedures.CreateBinaryReader(udpData, 1);
r.MessageId32 = reader.ReadUInt32();
r.ReceiverStatus = (MessageSessionStatusCode)reader.ReadByte();
var flags = reader.ReadByte();
if ((flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
if (r.ReceiverStatus == MessageSessionStatusCode.encryptionDecryptionCompleted)
{
r.ReceiverFinalNonce = reader.ReadBytes(ReceiverFinalNonceSize);
}
r.MessageHMAC = HMAC.Decode(reader);
return(r);
}
public static DmpPingPacket DecodeAndVerify(byte[] udpData, InviteSession session)
{
var reader = PacketProcedures.CreateBinaryReader(udpData, 1);
var r = new DmpPingPacket();
r.DirectChannelToken32 = DirectChannelToken32.Decode(reader);
r.PingRequestId32 = reader.ReadUInt32();
var flags = reader.ReadByte();
if ((flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
if ((flags & Flags_PublicEcdheKeySet) != 0)
{
r.PublicEcdheKey = EcdhPublicKey.Decode(reader);
}
r.PingPongHMAC = HMAC.Decode(reader);
// verify DirectChannelToken32
if (!r.DirectChannelToken32.Equals(session.LocalSessionDescription.DirectChannelToken32))
{
throw new BadSignatureException("invalid DMP PING DirectChannelToken32 136");
}
// verify PingPongHMAC
if (r.PingPongHMAC.Equals(
session.GetPingPongHMAC(r.GetSignedFieldsForPingPongHMAC)
) == false)
{
throw new BadSignatureException("invalid DMP PING PingPongHMAC 1237");
}
return(r);
}
public static DmpPongPacket Decode(byte[] udpData)
{
var reader = PacketProcedures.CreateBinaryReader(udpData, 1);
var r = new DmpPongPacket();
r.DirectChannelToken32 = DirectChannelToken32.Decode(reader);
r.PingRequestId32 = reader.ReadUInt32();
var flags = reader.ReadByte();
if ((flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
if ((flags & Flags_PublicEcdheKeySet) != 0)
{
r.PublicEcdheKey = EcdhPublicKey.Decode(reader);
}
r.PingPongHMAC = HMAC.Decode(reader);
return(r);
}
/// <summary>
/// decodes the packet, decrypts ToNeighborTxParametersEncrypted, verifies NeighborSignature, verifies match to register REQ
/// </summary>
/// <param name="newConnectionToNeighborAtRequesterNullable">if not null (at requester) - this procedure verifies ResponderSignature</param>
/// <param name="reader">is positioned after first byte = packet type</param>
public static RegisterAck1Packet DecodeAndOptionallyVerify(Logger logger, byte[] ack1UdpData, RegisterRequestPacket reqNullable,
ConnectionToNeighbor newConnectionToNeighborAtRequesterNullable)
{
var reader = PacketProcedures.CreateBinaryReader(ack1UdpData, 1);
var ack1 = new RegisterAck1Packet();
ack1.DecodedUdpPayloadData = ack1UdpData;
ack1.Flags = reader.ReadByte();
if ((ack1.Flags & Flag_EPtoA) == 0)
{
ack1.NeighborToken32 = NeighborToken32.Decode(reader);
}
if ((ack1.Flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
ack1.RequesterRegistrationId = RegistrationId.Decode(reader);
ack1.ReqTimestamp64 = reader.ReadInt64();
ack1.ResponderEcdhePublicKey = EcdhPublicKey.Decode(reader);
ack1.ToResponderTxParametersEncrypted = reader.ReadBytes(ToResponderTxParametersEncryptedLength);
ack1.ResponderRegistrationId = RegistrationId.Decode(reader);
if (newConnectionToNeighborAtRequesterNullable != null)
{
if (reqNullable == null)
{
throw new ArgumentException();
}
ack1.ResponderSignature = RegistrationSignature.DecodeAndVerify(
reader, newConnectionToNeighborAtRequesterNullable.Engine.CryptoLibrary,
w =>
{
reqNullable.GetSharedSignedFields(w, true);
ack1.GetSharedSignedFields(w, false, true);
},
ack1.ResponderRegistrationId);
}
else
{ // at proxy we don't verify responder's signature, to avoid high spending of resources
ack1.ResponderSignature = RegistrationSignature.Decode(reader);
}
if (reqNullable != null)
{
ack1.AssertMatchToRegisterReq(reqNullable);
if (newConnectionToNeighborAtRequesterNullable != null)
{
newConnectionToNeighborAtRequesterNullable.Decrypt_ack1_ToResponderTxParametersEncrypted_AtRequester_DeriveSharedDhSecret(logger, reqNullable, ack1);
}
}
if ((ack1.Flags & Flag_EPtoA) != 0)
{
ack1.RequesterEndpoint = PacketProcedures.DecodeIPEndPoint(reader);
}
else
{
ack1.ReqP2pSeq16 = RequestP2pSequenceNumber16.Decode(reader);
ack1.NeighborHMAC = HMAC.Decode(reader);
}
return(ack1);
}
/// <summary>
/// when REQ is received from neighbor, verifies senderHMAC and NeighborToken32
/// </summary>
/// <param name="receivedFromNeighborNullable">is NULL when decoding REQ from A at EP</param>
public static RegisterRequestPacket Decode_OptionallyVerifyNeighborHMAC(byte[] udpData, ConnectionToNeighbor receivedFromNeighborNullable, int numberOfDimensions)
{
var r = new RegisterRequestPacket();
r.DecodedUdpPayloadData = udpData;
var reader = PacketProcedures.CreateBinaryReader(udpData, 1);
var flags = reader.ReadByte();
if ((flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
if ((flags & Flag_AtoEP) == 0)
{
if (receivedFromNeighborNullable == null)
{
throw new UnmatchedFieldsException();
}
r.NeighborToken32 = NeighborToken32.Decode(reader);
if (receivedFromNeighborNullable.LocalNeighborToken32.Equals(r.NeighborToken32) == false)
{
throw new UnmatchedFieldsException();
}
}
else
{
if (receivedFromNeighborNullable != null)
{
throw new UnmatchedFieldsException();
}
}
r.RequesterRegistrationId = RegistrationId.Decode(reader);
r.RequesterNeighborsBusySectorIds = reader.ReadUInt16();
r.RequesterEcdhePublicKey = EcdhPublicKey.Decode(reader);
r.ReqTimestamp64 = reader.ReadInt64();
r.MinimalDistanceToNeighbor = reader.ReadUInt32();
if ((flags & Flag_DirectionVectorExists) != 0)
{
r.DirectionVectorNullable = new sbyte[numberOfDimensions];
for (int i = 0; i < numberOfDimensions; i++)
{
r.DirectionVectorNullable[i] = reader.ReadSByte();
}
}
r.EpEndpoint = PacketProcedures.DecodeIPEndPoint(reader);
r.RequesterSignature = RegistrationSignature.Decode(reader);
if ((flags & Flag_AtoEP) != 0)
{
r.ProofOfWork2 = reader.ReadBytes(64);
}
r.NumberOfHopsRemaining = reader.ReadByte();
r.NumberOfRandomHopsRemaining = reader.ReadByte();
r.ReqP2pSeq16 = RequestP2pSequenceNumber16.Decode(reader);
if ((flags & Flag_AtoEP) == 0)
{
r.NeighborHMAC = HMAC.Decode(reader);
if (r.NeighborHMAC.Equals(receivedFromNeighborNullable.GetNeighborHMAC(r.GetSignedFieldsForNeighborHMAC)) == false)
{
throw new BadSignatureException("invalid REGISTER REQ NeighborHMAC 1573");
}
}
return(r);
}
/// <param name="newConnectionAtResponderToRequesterNullable">
/// direct P2P stream from N to A
/// if newConnectionAtResponderToRequesterNullable is specified, the procedure
/// verifies RequesterHMAC, decrypts endpoint of A (ToRequesterTxParametersEncrypted), initializes P2P stream
/// </param>
public static RegisterAck2Packet Decode_OptionallyVerify_InitializeP2pStreamAtResponder(Logger logger, byte[] registerAckPacketData,
RegisterRequestPacket reqNullable,
RegisterAck1Packet ack1Nullable,
ConnectionToNeighbor newConnectionAtResponderToRequesterNullable
)
{
var reader = PacketProcedures.CreateBinaryReader(registerAckPacketData, 1);
var ack = new RegisterAck2Packet();
ack.DecodedUdpPayloadData = registerAckPacketData;
ack.Flags = reader.ReadByte();
if ((ack.Flags & FlagsMask_MustBeZero) != 0)
{
throw new NotImplementedException();
}
if ((ack.Flags & Flag_AtoEP) == 0)
{
ack.NeighborToken32 = NeighborToken32.Decode(reader);
}
ack.ReqTimestamp64 = reader.ReadInt64();
ack.RequesterRegistrationId = RegistrationId.Decode(reader);
if (reqNullable != null)
{
ack.AssertMatchToSyn(reqNullable);
}
ack.ToRequesterTxParametersEncrypted = reader.ReadBytes(ToRequesterTxParametersEncryptedLength);
if (newConnectionAtResponderToRequesterNullable != null)
{
newConnectionAtResponderToRequesterNullable.Decrypt_ack2_ToRequesterTxParametersEncrypted_AtResponder_InitializeP2pStream(logger, reqNullable, ack1Nullable, ack);
}
ack.RequesterSignature = RegistrationSignature.Decode(reader);
if (newConnectionAtResponderToRequesterNullable != null)
{
if (reqNullable == null)
{
throw new ArgumentException();
}
if (ack1Nullable == null)
{
throw new ArgumentException();
}
if (!ack.RequesterSignature.Verify(newConnectionAtResponderToRequesterNullable.Engine.CryptoLibrary,
w =>
{
reqNullable.GetSharedSignedFields(w, true);
ack1Nullable.GetSharedSignedFields(w, true, true);
ack.GetSharedSignedFields(w, false, true);
},
reqNullable.RequesterRegistrationId))
{
throw new BadSignatureException("invalid REGISTER ACK2 RequesterSignature 6106");
}
}
ack.ReqP2pSeq16 = RequestP2pSequenceNumber16.Decode(reader);
if ((ack.Flags & Flag_AtoEP) == 0)
{
ack.NeighborHMAC = HMAC.Decode(reader); // is verified by Filter
}
return(ack);
}
void ThreadEntry()
{
IPEndPoint remoteEndpoint = default(IPEndPoint);
while (!_disposing)
{
try
{
_actionsQueue.ExecuteQueued();
var udpData = UdpSocket.Receive(ref remoteEndpoint);
var timestamp32 = _localPeer.Time32;
if (_previousTimestamp32.HasValue)
{
var timePassed32 = unchecked (timestamp32 - _previousTimestamp32.Value);
_pps.Input(1, timePassed32);
_bps.Input((udpData.Length + LocalLogicConfiguration.IpAndUdpHeadersSizeBytes) * 8, timePassed32);
}
_previousTimestamp32 = timestamp32;
var manager = _localPeer.Manager;
if (manager != null && _localPeer.Firewall.PacketIsAllowed(remoteEndpoint))
{
var packetType = P2ptpCommon.DecodeHeader(udpData);
if (packetType.HasValue)
{
switch (packetType.Value)
{
case PacketTypes.hello:
manager.ProcessReceivedHello(udpData, remoteEndpoint, this, timestamp32);
break;
case PacketTypes.peersListIpv4:
manager.ProcessReceivedSharedPeers(udpData, remoteEndpoint);
break;
case PacketTypes.extensionSignaling:
manager.ProcessReceivedExtensionSignalingPacket(PacketProcedures.CreateBinaryReader(udpData, P2ptpCommon.HeaderSize), remoteEndpoint);
break;
}
}
else
{
(var extension, var streamId, var index) = ExtensionProcedures.ParseReceivedExtensionPayloadPacket(udpData, _localPeer.Configuration.Extensions);
if (extension != null)
{
if (_streams.TryGetValue(streamId, out var stream))
{
stream.Extensions.TryGetValue(extension, out var streamExtension);
streamExtension.OnReceivedPayloadPacket(udpData, index);
}
//else _localPeer.WriteToLog(LogModules.Receiver, $"receiver {SocketInfo} got packet from bad stream id {streamId}");
}
}
}
}
// catch (InvalidOperationException)
// {// intentionally ignored (before "connection")
// }
catch (SocketException exc)
{
if (_disposing)
{
return;
}
if (exc.ErrorCode != 10054) // forcibly closed - ICMP port unreachable - it is normal when peer gets down
{
_localPeer.HandleException(LogModules.Receiver, exc);
}
// else ignore it
}
catch (Exception exc)
{
_localPeer.HandleException(LogModules.Receiver, exc);
}
}
}