public override SSUState HandleMessage(SSUHeader header, BufRefLen reader)
{
var tstime = SSUHost.SSUDateTime(header.TimeStamp);
if (header.MessageType != SSUHeader.MessageTypes.SessionCreated)
{
#if LOG_ALL_TRANSPORT
Logging.LogTransport("SSU SessionRequestState: Received unexpected message " + tstime.ToString() + " : " + header.Flag.ToString());
#endif
return(this);
}
SCMessage = new SessionCreated(reader, Session.RemoteRouter.Certificate);
Session.RelayTag = SCMessage.RelayTag;
Y = new I2PPublicKey((BufRefLen)SCMessage.Y, Session.RemoteRouter.Certificate);
BufUtils.DHI2PToSessionAndMAC(out Session.SharedKey, out Session.MACKey,
Y.ToBigInteger().ModPow(PrivateKey.ToBigInteger(), I2PConstants.ElGamalP));
var ipaddr = new IPAddress(SCMessage.Address.ToByteArray());
ushort port = SCMessage.Port.PeekFlip16(0);
Session.SignOnTimeB = SCMessage.SignOnTime.Peek32(0);
var btime = SSUHost.SSUDateTime(BufUtils.Flip32(Session.SignOnTimeB));
#if LOG_ALL_TRANSPORT
Logging.LogTransport("SSU SessionRequestState " + Session.DebugId + " : Received SessionCreated. " + tstime.ToString() + " : " + btime.ToString());
#endif
Session.Host.ReportedAddress(ipaddr);
if (!I2PSignature.SupportedSignatureType(Session.RemoteRouter.Certificate.SignatureType))
{
throw new SignatureCheckFailureException("SSU SessionRequestState " + Session.DebugId + " : " +
"Received non supported signature type: " +
Session.RemoteRouter.Certificate.SignatureType.ToString());
}
var cipher = new CbcBlockCipher(new AesEngine());
cipher.Init(false, Session.SharedKey.ToParametersWithIV(header.IV));
cipher.ProcessBytes(SCMessage.SignatureEncrBuf);
var baddr = new BufLen(Session.RemoteEP.Address.GetAddressBytes());
var sign = new I2PSignature((BufRefLen)SCMessage.Signature, Session.RemoteRouter.Certificate);
var sok = I2PSignature.DoVerify(
Session.RemoteRouter.SigningPublicKey, sign,
X.Key, Y.Key,
SCMessage.Address, SCMessage.Port,
baddr, BufUtils.Flip16BL((ushort)Session.RemoteEP.Port),
SCMessage.RelayTag, SCMessage.SignOnTime);
#if LOG_ALL_TRANSPORT
Logging.LogTransport("SSU SessionRequestState: Signature check: " + sok.ToString() + ". " + Session.RemoteRouter.Certificate.SignatureType.ToString());
#endif
if (!sok)
{
throw new SignatureCheckFailureException("SSU SessionRequestState " + Session.DebugId + ": Received SessionCreated signature check failed." +
Session.RemoteRouter.Certificate.ToString());
}
var relaytag = SCMessage.RelayTag.PeekFlip32(0);
if (relaytag != 0)
{
Session.Host.IntroductionRelayOffered(
new IntroducerInfo(
Session.RemoteEP.Address,
(ushort)Session.RemoteEP.Port,
Session.IntroKey, relaytag));
}
Logging.LogTransport("SSU SessionRequestState: Session " + Session.DebugId + " created. Moving to SessionConfirmedState.");
Session.ReportConnectionEstablished();
return(new SessionConfirmedState(Session, this));
}
public override SSUState HandleMessage(SSUHeader header, BufRefLen reader)
{
DataSent();
#if LOG_ALL_TRANSPORT
DebugUtils.Log("SSU EstablishedState +" + Session.TransportInstance.ToString() + "+ received: " +
header.MessageType.ToString() + ": " + SSUHost.SSUDateTime(header.TimeStamp).ToString());
#endif
switch (header.MessageType)
{
case SSUHeader.MessageTypes.Data:
try
{
var datamsg = new SSUDataMessage(reader, Session.Defragmenter);
if (datamsg.ExplicitAcks != null)
{
Session.Fragmenter.GotAck(datamsg.ExplicitAcks);
}
if (datamsg.AckBitfields != null)
{
Session.Fragmenter.GotAck(datamsg.AckBitfields);
}
if (datamsg.NewMessages != null)
{
foreach (var msg in datamsg.NewMessages)
{
var i2npmsg = I2NPMessage.ReadHeader5((BufRefLen)msg.GetPayload());
#if LOG_ALL_TRANSPORT
DebugUtils.Log("SSU EstablishedState +" + Session.TransportInstance.ToString() + "+ complete message " +
msg.MessageId.ToString() + ": " + i2npmsg.Expiration.ToString());
#endif
if (i2npmsg.MessageType == I2PCore.Tunnel.I2NP.Messages.I2NPMessage.MessageTypes.DeliveryStatus)
{
if (((DeliveryStatusMessage)i2npmsg.Message).IsNetworkId((ulong)I2PConstants.I2P_NETWORK_ID))
{
continue;
}
}
Session.MessageReceived(i2npmsg);
}
}
}
catch (Exception ex)
{
DebugUtils.Log("EstablishedState: SSUHost.SSUMessageTypes.Data", ex);
}
break;
case SSUHeader.MessageTypes.SessionDestroyed:
DebugUtils.LogDebug(() => string.Format("SSU EstablishedState {0}: SessionDestroyed received.", Session.DebugId));
SendSessionDestroyed();
return(null);
case SSUHeader.MessageTypes.PeerTest:
HandleIncomingPeerTestPackage(reader);
break;
case SSUHeader.MessageTypes.RelayResponse:
DebugUtils.LogDebug(() => string.Format("SSU EstablishedState {0}: RelayResponse received from {1}.",
Session.DebugId, Session.RemoteEP));
var response = new RelayResponse(reader);
Session.Host.ReportRelayResponse(header, response, Session.RemoteEP);
break;
case SSUHeader.MessageTypes.RelayIntro:
var intro = new RelayIntro(reader);
DebugUtils.LogDebug(() => $"SSU EstablishedState {Session.DebugId}: RelayIntro received from {Session.RemoteEP} for {intro.AliceEndpoint}.");
Session.Host.Send(intro.AliceEndpoint, new BufLen(new byte[0]));
break;
case SSUHeader.MessageTypes.RelayRequest:
// if ( !SSUHost.IntroductionSupported ) throw new Exception( "SSU relay introduction not supported" );
DebugUtils.LogDebug(() => string.Format("SSU EstablishedState {0}: Relay introduction not supported.", Session.DebugId));
break;
case SSUHeader.MessageTypes.SessionRequest:
DebugUtils.LogDebug(() => string.Format("SSU EstablishedState {0}: SessionRequest received. Ending session.", Session.DebugId));
SendSessionDestroyed();
return(null);
default:
DebugUtils.LogDebug(() => string.Format("SSU EstablishedState {0}: Unexpected message received: {1}.",
Session.DebugId, header.MessageType));
break;
}
return(this);
}