//internal void SendErrorResponseToRegisterReq(RegisterRequestPacket req, IPEndPoint requesterEndpoint,
// ConnectionToNeighbor neighbor, bool alreadyRepliedWithNPA, DrpResponderStatusCode errorCode)
//{
// WriteToLog_routing_higherLevelDetail($"routing failed, executing SendErrorResponseToRegisterReq()", req, neighbor?.LocalDrpPeer);
// if (alreadyRepliedWithNPA)
// {
// // send ack1
// _ = RespondToSourcePeerWithAck1_Error(requesterEndpoint, req, neighbor, errorCode);
// }
// else
// {
// // send NPACK
// SendNeighborPeerAckResponseToRegisterReq(req, requesterEndpoint, NextHopResponseOrFailureCode.failure_routeIsUnavailable, neighbor);
// }
//}
internal void SendNeighborPeerAckResponseToRegisterAck1(RegisterAck1Packet ack1, ConnectionToNeighbor neighbor)
{
var npAck = new NeighborPeerAckPacket
{
ReqP2pSeq16 = ack1.ReqP2pSeq16,
ResponseCode = ResponseOrFailureCode.accepted
};
npAck.NeighborToken32 = neighbor.RemoteNeighborToken32;
npAck.NeighborHMAC = neighbor.GetNeighborHMAC(w => npAck.GetSignedFieldsForNeighborHMAC(w, ack1.GetSignedFieldsForNeighborHMAC));
var npAckUdpData = npAck.Encode(false);
RespondToRequestAndRetransmissions(ack1.DecodedUdpPayloadData, npAckUdpData, neighbor.RemoteEndpoint);
}
void SendNeighborPeerAckResponseToCfm(InviteConfirmationPacket cfm, ConnectionToNeighbor neighbor)
{
var npAck = new NeighborPeerAckPacket
{
ReqP2pSeq16 = cfm.ReqP2pSeq16,
ResponseCode = ResponseOrFailureCode.accepted
};
npAck.NeighborToken32 = neighbor.RemoteNeighborToken32;
npAck.NeighborHMAC = neighbor.GetNeighborHMAC(w => npAck.GetSignedFieldsForNeighborHMAC(w, cfm.GetSignedFieldsForNeighborHMAC));
var npAckUdpData = npAck.Encode(false);
Engine.RespondToRequestAndRetransmissions(cfm.DecodedUdpPayloadData, npAckUdpData, neighbor.RemoteEndpoint);
}
void SendNeighborPeerAckResponseToRegisterCfm(RegisterConfirmationPacket cfm, IPEndPoint remoteEndpoint, ConnectionToNeighbor neighbor)
{
var npAck = new NeighborPeerAckPacket
{
ReqP2pSeq16 = cfm.ReqP2pSeq16,
ResponseCode = ResponseOrFailureCode.accepted
};
if (cfm.AtoEP == false)
{
npAck.NeighborToken32 = neighbor.RemoteNeighborToken32;
npAck.NeighborHMAC = neighbor.GetNeighborHMAC(w => npAck.GetSignedFieldsForNeighborHMAC(w, cfm.GetSignedFieldsForNeighborHMAC));
}
var npAckUdpData = npAck.Encode(cfm.AtoEP);
RespondToRequestAndRetransmissions(cfm.DecodedUdpPayloadData, npAckUdpData, remoteEndpoint);
}
/// <param name="waitNhaFromNeighborNullable">is used to verify NPACK.NeighborHMAC</param>
internal async Task <NeighborPeerAckPacket> OptionallySendUdpRequestAsync_Retransmit_WaitForNeighborPeerAck(string completionActionVisibleId, byte[] requestPacketDataNullable, IPEndPoint responderEndpoint,
RequestP2pSequenceNumber16 reqP2pSeq16, ConnectionToNeighbor waitNhaFromNeighborNullable = null, Action <BinaryWriter> npaRequestFieldsForNeighborHmacNullable = null)
{
var npaScanner = NeighborPeerAckPacket.GetScanner(reqP2pSeq16, waitNhaFromNeighborNullable, npaRequestFieldsForNeighborHmacNullable);
if (WriteToLog_udp_deepDetail_enabled)
{
WriteToLog_udp_deepDetail($"waiting for NPACK, scanner: {MiscProcedures.ByteArrayToString(npaScanner.ResponseFirstBytes)} npaSeq={reqP2pSeq16}");
}
var nextHopResponsePacketData = await SendUdpRequestAsync_Retransmit(
new PendingLowLevelUdpRequest(completionActionVisibleId, responderEndpoint,
npaScanner,
DateTimeNowUtc, Configuration.UdpLowLevelRequests_ExpirationTimeoutS,
requestPacketDataNullable,
Configuration.UdpLowLevelRequests_InitialRetransmissionTimeoutS, Configuration.UdpLowLevelRequests_RetransmissionTimeoutIncrement
));
if (nextHopResponsePacketData == null)
{
string desc = "no NPACK response to DRP request '";
if (requestPacketDataNullable != null)
{
desc += (PacketTypes)requestPacketDataNullable[0];
}
desc += $"' - timeout expired ({Configuration.UdpLowLevelRequests_ExpirationTimeoutS}s) completionAction={completionActionVisibleId}";
if (waitNhaFromNeighborNullable != null)
{
desc += $", neighbor={waitNhaFromNeighborNullable}";
}
throw new DrpTimeoutException(desc);
}
var nextHopResponsePacket = new NeighborPeerAckPacket(nextHopResponsePacketData);
if (nextHopResponsePacket.ResponseCode != ResponseOrFailureCode.accepted)
{
if (WriteToLog_udp_deepDetail_enabled)
{
WriteToLog_udp_deepDetail($"got NPACK with {nextHopResponsePacket.ResponseCode} throwing exception");
}
throw new RequestRejectedException(nextHopResponsePacket.ResponseCode);
}
return(nextHopResponsePacket);
}
internal void SendNeighborPeerAck(ResponseOrFailureCode responseCode)
{
var npAck = new NeighborPeerAckPacket
{
ReqP2pSeq16 = ReqP2pSeq16,
ResponseCode = responseCode
};
if (ReceivedFromNeighborNullable != null)
{
npAck.NeighborToken32 = ReceivedFromNeighborNullable.RemoteNeighborToken32;
npAck.NeighborHMAC = ReceivedFromNeighborNullable.GetNeighborHMAC(w => npAck.GetSignedFieldsForNeighborHMAC(w, GetSignedFieldsForNeighborHMAC));
}
var npAckUdpData = npAck.Encode(ReceivedFromNeighborNullable == null);
_engine.RespondToRequestAndRetransmissions(RequestUdpPayloadData, npAckUdpData, ReceivedFromEndpoint);
_repliedWithNPA = true;
}
public async Task <byte[]> SendRequestAsync(string completionActionVisibleId)
{
// wait for NPACK (-accepted or -failure)
_logger.WriteToLog_detail($"[{completionActionVisibleId}] >> SendRequestAsync() _requestUdpData={MiscProcedures.GetArrayHashCodeString(_requestUdpData)}");
await _engine.OptionallySendUdpRequestAsync_Retransmit_WaitForNeighborPeerAck(completionActionVisibleId + "_first_npack", _requestUdpData, _destinationEndpoint, _sentReqP2pSeq16);
// wait for ACK1 OR FAILURE
await Task.WhenAny(
WaitForAck1Async(completionActionVisibleId + "_ack1"),
WaitForFailureAsync(completionActionVisibleId + "_failure")
);
if (_pendingAck1Request != null)
{
_engine.CancelPendingRequest(_pendingAck1Request);
_pendingAck1Request = null;
}
if (_pendingFailureRequest != null)
{
_engine.CancelPendingRequest(_pendingFailureRequest);
_pendingFailureRequest = null;
}
if (_waitForAck1Completed)
{
if (Ack1UdpData == null)
{
ThrowTimeoutException(completionActionVisibleId);
}
_logger.WriteToLog_detail($"received ACK1");
return(Ack1UdpData);
}
else if (_waitForFailureCompleted)
{
if (_failureUdpData == null)
{
ThrowTimeoutException(completionActionVisibleId);
}
_logger.WriteToLog_detail($"received FAILURE");
var failure = FailurePacket.DecodeAndOptionallyVerify(_failureUdpData, _sentReqP2pSeq16);
if (_failureUdpData != null)
{
// send NPACK to FAILURE
var npAckToFailure = new NeighborPeerAckPacket
{
ReqP2pSeq16 = _sentReqP2pSeq16,
ResponseCode = ResponseOrFailureCode.accepted
};
if (_destinationNeighborNullable != null)
{
npAckToFailure.NeighborToken32 = _destinationNeighborNullable.RemoteNeighborToken32;
npAckToFailure.NeighborHMAC = _destinationNeighborNullable.GetNeighborHMAC(w => npAckToFailure.GetSignedFieldsForNeighborHMAC(w, failure.GetSignedFieldsForNeighborHMAC));
}
var npAckToFailureUdpData = npAckToFailure.Encode(_destinationNeighborNullable == null);
_engine.RespondToRequestAndRetransmissions(_failureUdpData, npAckToFailureUdpData, _destinationEndpoint);
}
throw new RequestRejectedException(failure.ResponseCode);
}
else
{
throw new InvalidOperationException();
}
}