public void Remove(Session session, SocketAddress address)
{
Session existing;
_Sessions.TryRemove(address, out session);
_SessionsByID.TryRemove(session.SessionID, out existing);
_SessionList.Remove(session);
}
public void AddSession(SocketAddress address, Session session)
{
if (_Sessions.TryAdd(address, session))
{
_SessionsByID.TryAdd(session.SessionID, session);
_SessionList.Add(session);
}
}
public void ProcessHandshake(DTLSRecord record)
{
SocketAddress address = record.RemoteEndPoint.Serialize();
Session session = Sessions.GetSession(address);
byte[] data;
if ((session != null) && session.IsEncypted(record))
{
int count = 0;
while ((session.Cipher == null) && (count < 50))
{
System.Threading.Thread.Sleep(10);
count++;
}
if (session.Cipher == null)
{
throw new Exception();
}
if (session.Cipher != null)
{
long sequenceNumber = ((long)record.Epoch << 48) + record.SequenceNumber;
data = session.Cipher.DecodeCiphertext(sequenceNumber, (byte)TRecordType.Handshake, record.Fragment, 0, record.Fragment.Length);
}
else
data = record.Fragment;
}
else
data = record.Fragment;
using (MemoryStream stream = new MemoryStream(data))
{
HandshakeRecord handshakeRecord = HandshakeRecord.Deserialise(stream);
if (handshakeRecord != null)
{
#if DEBUG
Console.WriteLine(handshakeRecord.MessageType.ToString());
#endif
switch (handshakeRecord.MessageType)
{
case THandshakeType.HelloRequest:
//HelloReq
break;
case THandshakeType.ClientHello:
ClientHello clientHello = ClientHello.Deserialise(stream);
if (clientHello != null)
{
byte[] cookie = clientHello.CalculateCookie(record.RemoteEndPoint, _HelloSecret);
if (clientHello.Cookie == null)
{
Version version = clientHello.ClientVersion;
if (ServerVersion < version)
version = ServerVersion;
if (session == null)
{
session = new Session();
session.SessionID = Guid.NewGuid();
session.RemoteEndPoint = record.RemoteEndPoint;
session.Version = version;
Sessions.AddSession(address, session);
}
else
{
session.Reset();
session.Version = version;
}
session.ClientEpoch = record.Epoch;
session.ClientSequenceNumber = record.SequenceNumber;
//session.Handshake.UpdateHandshakeHash(data);
HelloVerifyRequest helloVerifyRequest = new HelloVerifyRequest();
helloVerifyRequest.Cookie = cookie;
helloVerifyRequest.ServerVersion = ServerVersion;
SendResponse(session, (IHandshakeMessage)helloVerifyRequest, 0);
}
else
{
if (session != null && session.Cipher != null && !session.IsEncypted(record))
{
session.Reset();
}
if (TLSUtils.ByteArrayCompare(clientHello.Cookie, cookie))
{
Version version = clientHello.ClientVersion;
if (ServerVersion < version)
version = ServerVersion;
if (clientHello.SessionID == null)
{
if (session == null)
{
session = new Session();
session.NextSequenceNumber();
session.SessionID = Guid.NewGuid();
session.RemoteEndPoint = record.RemoteEndPoint;
Sessions.AddSession(address, session);
}
}
else
{
Guid sessionID = Guid.Empty;
if (clientHello.SessionID.Length >= 16)
{
byte[] receivedSessionID = new byte[16];
Buffer.BlockCopy(clientHello.SessionID, 0, receivedSessionID, 0, 16);
sessionID = new Guid(receivedSessionID);
}
if (sessionID != Guid.Empty)
session = Sessions.GetSession(sessionID);
if (session == null)
{
//need to Find Session
session = new Session();
session.SessionID = Guid.NewGuid();
session.NextSequenceNumber();
session.RemoteEndPoint = record.RemoteEndPoint;
Sessions.AddSession(address, session);
//session.Version = clientHello.ClientVersion;
}
}
session.Version = version;
session.Handshake.InitaliseHandshakeHash(version < DTLSRecord.Version1_2);
session.Handshake.UpdateHandshakeHash(data);
TCipherSuite cipherSuite = TCipherSuite.TLS_NULL_WITH_NULL_NULL;
foreach (TCipherSuite item in clientHello.CipherSuites)
{
if (_SupportedCipherSuites.ContainsKey(item) && CipherSuites.SupportedVersion(item, session.Version) && CipherSuites.SuiteUsable(item, PrivateKey, _PSKIdentities, _ValidatePSK != null))
{
cipherSuite = item;
break;
}
}
TKeyExchangeAlgorithm keyExchangeAlgorithm = CipherSuites.GetKeyExchangeAlgorithm(cipherSuite);
ServerHello serverHello = new ServerHello();
byte[] clientSessionID = new byte[32];
byte[] temp = session.SessionID.ToByteArray();
Buffer.BlockCopy(temp, 0, clientSessionID, 0, 16);
Buffer.BlockCopy(temp, 0, clientSessionID, 16, 16);
serverHello.SessionID = clientSessionID;// session.SessionID.ToByteArray();
serverHello.Random = new RandomData();
serverHello.Random.Generate();
serverHello.CipherSuite = (ushort)cipherSuite;
serverHello.ServerVersion = session.Version;
THashAlgorithm hash = THashAlgorithm.SHA256;
TEllipticCurve curve = TEllipticCurve.secp521r1;
if (clientHello.Extensions != null)
{
foreach (Extension extension in clientHello.Extensions)
{
if (extension.SpecifcExtension is ClientCertificateTypeExtension)
{
ClientCertificateTypeExtension clientCertificateType = extension.SpecifcExtension as ClientCertificateTypeExtension;
//TCertificateType certificateType = TCertificateType.Unknown;
//foreach (TCertificateType item in clientCertificateType.CertificateTypes)
//{
//}
//serverHello.AddExtension(new ClientCertificateTypeExtension(certificateType));
}
else if (extension.SpecifcExtension is EllipticCurvesExtension)
{
EllipticCurvesExtension ellipticCurves = extension.SpecifcExtension as EllipticCurvesExtension;
foreach (TEllipticCurve item in ellipticCurves.SupportedCurves)
{
if (EllipticCurveFactory.SupportedCurve(item))
{
curve = item;
break;
}
}
}
else if (extension.SpecifcExtension is ServerCertificateTypeExtension)
{
//serverHello.AddExtension();
}
else if (extension.SpecifcExtension is SignatureAlgorithmsExtension)
{
SignatureAlgorithmsExtension signatureAlgorithms = extension.SpecifcExtension as SignatureAlgorithmsExtension;
foreach (SignatureHashAlgorithm item in signatureAlgorithms.SupportedAlgorithms)
{
if (item.Signature == TSignatureAlgorithm.ECDSA)
{
hash = item.Hash;
break;
}
}
}
}
}
session.Handshake.CipherSuite = cipherSuite;
session.Handshake.ClientRandom = clientHello.Random;
session.Handshake.ServerRandom = serverHello.Random;
if (keyExchangeAlgorithm == TKeyExchangeAlgorithm.ECDHE_ECDSA)
{
EllipticCurvePointFormatsExtension pointFormatsExtension = new EllipticCurvePointFormatsExtension();
pointFormatsExtension.SupportedPointFormats.Add(TEllipticCurvePointFormat.Uncompressed);
serverHello.AddExtension(pointFormatsExtension);
}
session.Handshake.MessageSequence = 1;
SendResponse(session, serverHello, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
if (keyExchangeAlgorithm == TKeyExchangeAlgorithm.ECDHE_ECDSA)
{
if (Certificate != null)
{
SendResponse(session, Certificate, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
}
ECDHEKeyExchange keyExchange = new ECDHEKeyExchange();
keyExchange.Curve = curve;
keyExchange.KeyExchangeAlgorithm = keyExchangeAlgorithm;
keyExchange.ClientRandom = clientHello.Random;
keyExchange.ServerRandom = serverHello.Random;
keyExchange.GenerateEphemeralKey();
session.Handshake.KeyExchange = keyExchange;
if (session.Version == DTLSRecord.DefaultVersion)
hash = THashAlgorithm.SHA1;
ECDHEServerKeyExchange serverKeyExchange = new ECDHEServerKeyExchange(keyExchange, hash, TSignatureAlgorithm.ECDSA, PrivateKey);
SendResponse(session, serverKeyExchange, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
if (_RequireClientCertificate)
{
CertificateRequest certificateRequest = new CertificateRequest();
certificateRequest.CertificateTypes.Add(TClientCertificateType.ECDSASign);
certificateRequest.SupportedAlgorithms.Add(new SignatureHashAlgorithm() { Hash = THashAlgorithm.SHA256, Signature = TSignatureAlgorithm.ECDSA });
SendResponse(session, certificateRequest, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
}
}
else if (keyExchangeAlgorithm == TKeyExchangeAlgorithm.ECDHE_PSK)
{
ECDHEKeyExchange keyExchange = new ECDHEKeyExchange();
keyExchange.Curve = curve;
keyExchange.KeyExchangeAlgorithm = keyExchangeAlgorithm;
keyExchange.ClientRandom = clientHello.Random;
keyExchange.ServerRandom = serverHello.Random;
keyExchange.GenerateEphemeralKey();
session.Handshake.KeyExchange = keyExchange;
ECDHEPSKServerKeyExchange serverKeyExchange = new ECDHEPSKServerKeyExchange(keyExchange);
SendResponse(session, serverKeyExchange, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
}
else if (keyExchangeAlgorithm == TKeyExchangeAlgorithm.PSK)
{
PSKKeyExchange keyExchange = new PSKKeyExchange();
keyExchange.KeyExchangeAlgorithm = keyExchangeAlgorithm;
keyExchange.ClientRandom = clientHello.Random;
keyExchange.ServerRandom = serverHello.Random;
session.Handshake.KeyExchange = keyExchange;
//Need to be able to hint identity?? for PSK if not hinting don't really need key exchange message
//PSKServerKeyExchange serverKeyExchange = new PSKServerKeyExchange();
//SendResponse(session, serverKeyExchange, session.Handshake.MessageSequence);
//session.Handshake.MessageSequence++;
}
SendResponse(session, new ServerHelloDone(), session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
}
}
}
break;
case THandshakeType.ServerHello:
break;
case THandshakeType.HelloVerifyRequest:
break;
case THandshakeType.Certificate:
Certificate clientCertificate = Certificate.Deserialise(stream, TCertificateType.X509);
if (clientCertificate.CertChain.Count > 0)
{
session.CertificateInfo = Certificates.GetCertificateInfo(clientCertificate.CertChain[0], TCertificateFormat.CER);
}
session.Handshake.UpdateHandshakeHash(data);
break;
case THandshakeType.ServerKeyExchange:
break;
case THandshakeType.CertificateRequest:
break;
case THandshakeType.ServerHelloDone:
break;
case THandshakeType.CertificateVerify:
CertificateVerify certificateVerify = CertificateVerify.Deserialise(stream, session.Version);
session.Handshake.UpdateHandshakeHash(data);
break;
case THandshakeType.ClientKeyExchange:
if ((session == null) || (session.Handshake.KeyExchange == null))
{
}
else
{
session.Handshake.UpdateHandshakeHash(data);
byte[] preMasterSecret = null;
if (session.Handshake.KeyExchange.KeyExchangeAlgorithm == TKeyExchangeAlgorithm.ECDHE_ECDSA)
{
ECDHEClientKeyExchange clientKeyExchange = ECDHEClientKeyExchange.Deserialise(stream);
if (clientKeyExchange != null)
{
ECDHEKeyExchange ecKeyExchange = session.Handshake.KeyExchange as ECDHEKeyExchange;
preMasterSecret = ecKeyExchange.GetPreMasterSecret(clientKeyExchange.PublicKeyBytes);
}
}
else if (session.Handshake.KeyExchange.KeyExchangeAlgorithm == TKeyExchangeAlgorithm.ECDHE_PSK)
{
ECDHEPSKClientKeyExchange clientKeyExchange = ECDHEPSKClientKeyExchange.Deserialise(stream);
if (clientKeyExchange != null)
{
session.PSKIdentity = Encoding.UTF8.GetString(clientKeyExchange.PSKIdentity);
byte[] psk = _PSKIdentities.GetKey(clientKeyExchange.PSKIdentity);
if (psk == null)
{
psk = _ValidatePSK(clientKeyExchange.PSKIdentity);
if (psk != null)
{
_PSKIdentities.AddIdentity(clientKeyExchange.PSKIdentity, psk);
}
}
if (psk != null)
{
ECDHEKeyExchange ecKeyExchange = session.Handshake.KeyExchange as ECDHEKeyExchange;
byte[] otherSecret = ecKeyExchange.GetPreMasterSecret(clientKeyExchange.PublicKeyBytes);
preMasterSecret = TLSUtils.GetPSKPreMasterSecret(otherSecret, psk);
}
}
}
else if (session.Handshake.KeyExchange.KeyExchangeAlgorithm == TKeyExchangeAlgorithm.PSK)
{
PSKClientKeyExchange clientKeyExchange = PSKClientKeyExchange.Deserialise(stream);
if (clientKeyExchange != null)
{
session.PSKIdentity = Encoding.UTF8.GetString(clientKeyExchange.PSKIdentity);
byte[] psk = _PSKIdentities.GetKey(clientKeyExchange.PSKIdentity);
if (psk == null)
{
psk = _ValidatePSK(clientKeyExchange.PSKIdentity);
if (psk != null)
{
_PSKIdentities.AddIdentity(clientKeyExchange.PSKIdentity, psk);
}
}
if (psk != null)
{
ECDHEKeyExchange ecKeyExchange = session.Handshake.KeyExchange as ECDHEKeyExchange;
byte[] otherSecret = new byte[psk.Length];
preMasterSecret = TLSUtils.GetPSKPreMasterSecret(otherSecret, psk);
}
}
}
if (preMasterSecret != null)
{
//session.MasterSecret = TLSUtils.CalculateMasterSecret(preMasterSecret, session.KeyExchange);
//TLSUtils.AssignCipher(session);
session.Cipher = TLSUtils.AssignCipher(preMasterSecret, false, session.Version, session.Handshake);
}
}
break;
case THandshakeType.Finished:
Finished finished = Finished.Deserialise(stream);
if (session != null)
{
byte[] handshakeHash = session.Handshake.GetHash();
byte[] calculatedVerifyData = TLSUtils.GetVerifyData(session.Version,session.Handshake,false, true, handshakeHash);
#if DEBUG
Console.Write("Handshake Hash:");
TLSUtils.WriteToConsole(handshakeHash);
Console.Write("Sent Verify:");
TLSUtils.WriteToConsole(finished.VerifyData);
Console.Write("Calc Verify:");
TLSUtils.WriteToConsole(calculatedVerifyData);
#endif
if (TLSUtils.ByteArrayCompare(finished.VerifyData, calculatedVerifyData))
{
SendChangeCipherSpec(session);
session.Handshake.UpdateHandshakeHash(data);
handshakeHash = session.Handshake.GetHash();
Finished serverFinished = new Finished();
serverFinished.VerifyData = TLSUtils.GetVerifyData(session.Version,session.Handshake,false, false, handshakeHash);
SendResponse(session, serverFinished, session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
}
else
{
throw new Exception();
}
}
break;
default:
break;
}
}
}
}
private void SendChangeCipherSpec(Session session)
{
int size = 1;
int responseSize = DTLSRecord.RECORD_OVERHEAD + size;
byte[] response = new byte[responseSize];
DTLSRecord record = new DTLSRecord();
record.RecordType = TRecordType.ChangeCipherSpec;
record.Epoch = session.Epoch;
record.SequenceNumber = session.NextSequenceNumber();
record.Fragment = new byte[size];
record.Fragment[0] = 1;
if (session.Version != null)
record.Version = session.Version;
using (MemoryStream stream = new MemoryStream(response))
{
record.Serialise(stream);
}
SocketAsyncEventArgs parameters = new SocketAsyncEventArgs()
{
RemoteEndPoint = session.RemoteEndPoint
};
parameters.SetBuffer(response, 0, responseSize);
_Socket.SendToAsync(parameters);
session.ChangeEpoch();
}
private DTLSRecord CreateRecord(Session session, IHandshakeMessage handshakeMessage, ushort messageSequence)
{
int size = handshakeMessage.CalculateSize(session.Version);
DTLSRecord record = new DTLSRecord();
record.RecordType = TRecordType.Handshake;
record.Epoch = session.Epoch;
record.SequenceNumber = session.NextSequenceNumber();
record.Fragment = new byte[HandshakeRecord.RECORD_OVERHEAD + size];
if (session.Version != null)
record.Version = session.Version;
HandshakeRecord handshakeRecord = new HandshakeRecord();
handshakeRecord.MessageType = handshakeMessage.MessageType;
handshakeRecord.MessageSeq = messageSequence;
handshakeRecord.Length = (uint)size;
handshakeRecord.FragmentLength = (uint)size;
using (MemoryStream stream = new MemoryStream(record.Fragment))
{
handshakeRecord.Serialise(stream);
handshakeMessage.Serialise(stream, session.Version);
}
if (handshakeMessage.MessageType != THandshakeType.HelloVerifyRequest)
{
session.Handshake.UpdateHandshakeHash(record.Fragment);
}
if (session.Cipher != null)
{
long sequenceNumber = ((long)record.Epoch << 48) + record.SequenceNumber;
record.Fragment = session.Cipher.EncodePlaintext(sequenceNumber, (byte)TRecordType.Handshake, record.Fragment, 0, record.Fragment.Length);
}
return record;
}
private void SendResponseEnd(Session session, IHandshakeMessage handshakeMessage, ushort messageSequence)
{
int size = handshakeMessage.CalculateSize(session.Version);
int maxPayloadSize = _MaxPacketSize - DTLSRecord.RECORD_OVERHEAD + HandshakeRecord.RECORD_OVERHEAD;
if (size > maxPayloadSize)
{
}
else
{
DTLSRecord record = CreateRecord(session, handshakeMessage, messageSequence);
session.Handshake.MessageSequence++;
DTLSRecord recordEnd = CreateRecord(session, new ServerHelloDone(), session.Handshake.MessageSequence);
session.Handshake.MessageSequence++;
int responseSize = DTLSRecord.RECORD_OVERHEAD + record.Fragment.Length + DTLSRecord.RECORD_OVERHEAD + recordEnd.Fragment.Length;
byte[] response = new byte[responseSize];
using (MemoryStream stream = new MemoryStream(response))
{
record.Serialise(stream);
recordEnd.Serialise(stream);
}
SocketAsyncEventArgs parameters = new SocketAsyncEventArgs()
{
RemoteEndPoint = session.RemoteEndPoint
};
parameters.SetBuffer(response, 0, responseSize);
_Socket.SendToAsync(parameters);
}
}
private void SendResponse(Session session, IHandshakeMessage handshakeMessage, ushort messageSequence)
{
int size = handshakeMessage.CalculateSize(session.Version);
int maxPayloadSize = _MaxPacketSize - DTLSRecord.RECORD_OVERHEAD + HandshakeRecord.RECORD_OVERHEAD;
if (size > maxPayloadSize)
{
}
else
{
DTLSRecord record = new DTLSRecord();
record.RecordType = TRecordType.Handshake;
record.Epoch = session.Epoch;
record.SequenceNumber = session.NextSequenceNumber();
record.Fragment = new byte[HandshakeRecord.RECORD_OVERHEAD + size];
if (session.Version != null)
record.Version = session.Version;
HandshakeRecord handshakeRecord = new HandshakeRecord();
handshakeRecord.MessageType = handshakeMessage.MessageType;
handshakeRecord.MessageSeq = messageSequence;
handshakeRecord.Length = (uint)size;
handshakeRecord.FragmentLength = (uint)size;
using (MemoryStream stream = new MemoryStream(record.Fragment))
{
handshakeRecord.Serialise(stream);
handshakeMessage.Serialise(stream, session.Version);
}
if (handshakeMessage.MessageType != THandshakeType.HelloVerifyRequest)
{
session.Handshake.UpdateHandshakeHash(record.Fragment);
}
int responseSize = DTLSRecord.RECORD_OVERHEAD + HandshakeRecord.RECORD_OVERHEAD + size;
if (session.Cipher != null)
{
long sequenceNumber = ((long)record.Epoch << 48) + record.SequenceNumber;
record.Fragment = session.Cipher.EncodePlaintext(sequenceNumber, (byte)TRecordType.Handshake, record.Fragment, 0, record.Fragment.Length);
responseSize = DTLSRecord.RECORD_OVERHEAD + record.Fragment.Length;
}
byte[] response = new byte[responseSize];
using (MemoryStream stream = new MemoryStream(response))
{
record.Serialise(stream);
}
SocketAsyncEventArgs parameters = new SocketAsyncEventArgs()
{
RemoteEndPoint = session.RemoteEndPoint
};
parameters.SetBuffer(response, 0, responseSize);
_Socket.SendToAsync(parameters);
}
}
private void SendAlert(Session session, SocketAddress address, TAlertLevel alertLevel, TAlertDescription alertDescription)
{
if (session != null)
{
DTLSRecord record = new DTLSRecord();
record.RecordType = TRecordType.Alert;
record.Epoch = session.Epoch;
record.SequenceNumber = session.NextSequenceNumber();
if (session.Version != null)
record.Version = session.Version;
long sequenceNumber = ((long)record.Epoch << 48) + record.SequenceNumber;
byte[] data = new byte[2];
data[0] = (byte)alertLevel;
data[1] = (byte)alertDescription;
if (session.Cipher == null)
record.Fragment = data;
else
record.Fragment = session.Cipher.EncodePlaintext(sequenceNumber, (byte)TRecordType.ApplicationData, data, 0, data.Length);
int responseSize = DTLSRecord.RECORD_OVERHEAD + record.Fragment.Length;
byte[] response = new byte[responseSize];
using (MemoryStream stream = new MemoryStream(response))
{
record.Serialise(stream);
}
SocketAsyncEventArgs parameters = new SocketAsyncEventArgs()
{
RemoteEndPoint = session.RemoteEndPoint
};
parameters.SetBuffer(response, 0, responseSize);
_Socket.SendToAsync(parameters);
}
}
private void ProcessRecord(SocketAddress address, Session session, DTLSRecord record)
{
try
{
#if DEBUG
Console.WriteLine(record.RecordType.ToString());
#endif
switch (record.RecordType)
{
case TRecordType.ChangeCipherSpec:
if (session != null)
{
session.ClientEpoch++;
session.ClientSequenceNumber = 0;
session.SetEncyptChange(record);
}
break;
case TRecordType.Alert:
if (session != null)
{
AlertRecord alertRecord;
try
{
if (session.Cipher == null)
{
alertRecord = AlertRecord.Deserialise(record.Fragment);
}
else
{
long sequenceNumber = ((long)record.Epoch << 48) + record.SequenceNumber;
byte[] data = session.Cipher.DecodeCiphertext(sequenceNumber, (byte)TRecordType.Alert, record.Fragment, 0, record.Fragment.Length);
alertRecord = AlertRecord.Deserialise(data);
}
}
catch
{
alertRecord = new AlertRecord();
alertRecord.AlertLevel = TAlertLevel.Fatal;
}
if (alertRecord.AlertLevel == TAlertLevel.Fatal)
_Sessions.Remove(session, address);
else if ((alertRecord.AlertLevel == TAlertLevel.Warning) || (alertRecord.AlertDescription == TAlertDescription.CloseNotify))
{
if (alertRecord.AlertDescription == TAlertDescription.CloseNotify)
SendAlert(session, address, TAlertLevel.Warning, TAlertDescription.CloseNotify);
_Sessions.Remove(session, address);
}
}
break;
case TRecordType.Handshake:
_Handshake.ProcessHandshake(record);
break;
case TRecordType.ApplicationData:
if (session != null)
{
if (session.Cipher != null)
{
long sequenceNumber = ((long)record.Epoch << 48) + record.SequenceNumber;
byte[] data = session.Cipher.DecodeCiphertext(sequenceNumber, (byte)TRecordType.ApplicationData, record.Fragment, 0, record.Fragment.Length);
if (DataReceived != null)
{
DataReceived(record.RemoteEndPoint, data);
}
}
}
break;
default:
break;
}
}
#if DEBUG
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
#else
catch
{
#endif
SendAlert(session, address, TAlertLevel.Fatal, TAlertDescription.InternalError);
}
}
private void CheckSession(Session session, DTLSRecord record)
{
if ((session.ClientEpoch == record.Epoch) && (session.ClientSequenceNumber == record.SequenceNumber))
{
ThreadPool.QueueUserWorkItem(ProcessRecord, record);
}
else if (session.ClientEpoch > record.Epoch)
{
ThreadPool.QueueUserWorkItem(ProcessRecord, record);
}
else if ((session.ClientEpoch == record.Epoch) && (session.ClientSequenceNumber > record.SequenceNumber))
{
ThreadPool.QueueUserWorkItem(ProcessRecord, record);
}
else
{
bool canProcessNow = false;
lock (session)
{
if ((session.ClientSequenceNumber == record.SequenceNumber) && (session.ClientEpoch == record.Epoch))
{
canProcessNow = true;
}
else
{
session.Records.Add(record);
}
}
if (canProcessNow)
CheckSession(session, record);
}
}