/// <summary> /// Timestamp32S, NeighborToken32 and NeighborHMAC are verified at this time /// </summary> /// <returns> /// true to retry the request with another neighbor (if the request needs to be "rerouted") /// </returns> internal async Task <bool> ProxyInviteRequestAsync(RoutedRequest routedRequest, ConnectionToNeighbor destinationPeer) { var req = routedRequest.InviteReq; var logger = routedRequest.Logger; logger.ModuleName = DrpPeerEngine.VisionChannelModuleName_inv_proxySide; if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"proxying {req} to {destinationPeer}"); } if (!routedRequest.CheckedRecentUniqueProxiedRequests) { if (!Engine.RecentUniqueInviteRequests.Filter(req.GetUniqueRequestIdFields)) { logger.WriteToLog_higherLevelDetail($"rejecting non-unique {req}: requesterEndpoint={routedRequest.ReceivedFromEndpoint}"); await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_routeIsUnavailable); return(false); } routedRequest.CheckedRecentUniqueProxiedRequests = true; } if (req.NumberOfHopsRemaining > InviteRequestPacket.MaxNumberOfHopsRemaining) { await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_routeIsUnavailable); return(false); } if (req.NumberOfHopsRemaining <= 1) { await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_numberOfHopsRemainingReachedZero); return(false); } _pendingInviteRequests.Add(req.RequesterRegistrationId); try { // send NPACK to REQ if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"sending NPACK to REQ source peer"); } routedRequest.SendNeighborPeerAck_accepted_IfNotAlreadyReplied(); req.NumberOfHopsRemaining--; if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"decremented number of hops in {req}: NumberOfHopsRemaining={req.NumberOfHopsRemaining}"); } // send (proxy) REQ to responder. wait for NPACK, verify NPACK.senderHMAC, retransmit REQ var reqUdpData = req.Encode_SetP2pFields(destinationPeer); #region wait for ACK1 from responder verify NeighborHMAC byte[] ack1UdpData; try { var sentRequest = new SentRequest(Engine, logger, destinationPeer.RemoteEndpoint, destinationPeer, reqUdpData, req.ReqP2pSeq16, InviteAck1Packet.GetScanner(logger, req, destinationPeer)); ack1UdpData = await sentRequest.SendRequestAsync("inv proxy ack1 3457"); } catch (RequestRejectedException reqExc) { logger.WriteToLog_higherLevelDetail($"got response={reqExc.ResponseCode} from destination {destinationPeer}. will try another neighbor.."); if (reqExc.ResponseCode == ResponseOrFailureCode.failure_numberOfHopsRemainingReachedZero) { await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_numberOfHopsRemainingReachedZero); return(false); } if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true) { logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 75675"); return(false); } if (reqExc.ResponseCode == ResponseOrFailureCode.failure_routeIsUnavailable) { req.NumberOfHopsRemaining++; // roll back previous decrement for a new trial } return(true); // will retry } catch (DrpTimeoutException exc) { logger.WriteToLog_higherLevelDetail($"got timeout error when requesting {destinationPeer}: {exc.Message}"); req.NumberOfHopsRemaining++; // roll back previous decrement for a new trial return(true); // will retry } catch (Exception reqExc) { logger.WriteToLog_mediumPain($"could not proxy INVITE request: {reqExc}"); if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true) { logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 76897805"); return(false); } return(true); // will retry } var ack1 = InviteAck1Packet.Decode(ack1UdpData); if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"verified ACK1 from responder"); } // respond with NPACK to ACk1 SendNeighborPeerAckResponseToAck1(ack1, destinationPeer); #endregion #region send ACK1 to requester, wait for NPACK and ACK2 var ack1UdpDataTx = ack1.Encode_SetP2pFields(routedRequest.ReceivedFromNeighborNullable); if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"sending ACK1, awaiting for NPACK"); } _ = Engine.OptionallySendUdpRequestAsync_Retransmit_WaitForNeighborPeerAck("ack1 13536", ack1UdpDataTx, routedRequest.ReceivedFromEndpoint, ack1.ReqP2pSeq16, routedRequest.ReceivedFromNeighborNullable, ack1.GetSignedFieldsForNeighborHMAC); // not waiting for NPACK, wait for ACK1 if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"waiting for ACK2"); } var ack2UdpData = await Engine.OptionallySendUdpRequestAsync_Retransmit_WaitForResponse("ack2 2346892", routedRequest.ReceivedFromNeighborNullable?.ToString() ?? routedRequest.ReceivedFromEndpoint.ToString(), null, routedRequest.ReceivedFromEndpoint, InviteAck2Packet.GetScanner(logger, req, routedRequest.ReceivedFromNeighborNullable)); if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"received ACK2"); } var ack2 = InviteAck2Packet.Decode(ack2UdpData); #endregion // send NPACK to ACK2 if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"sending NPACK to ACK2 to source peer"); } SendNeighborPeerAckResponseToAck2(ack2, routedRequest.ReceivedFromNeighborNullable); // send ACK2 to responder // put ACK2.ReqP2pSeq16, sendertoken32, senderHMAC // wait for NPACK var ack2UdpDataTx = ack2.Encode_SetP2pFields(destinationPeer); if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"sending ACK2 to responder"); } await destinationPeer.SendUdpRequestAsync_Retransmit_WaitForNPACK("ack2 5344530", ack2UdpDataTx, ack2.ReqP2pSeq16, ack2.GetSignedFieldsForNeighborHMAC); if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"received NPACK to ACK2 from destination peer"); } // wait for CFM from responder if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"waiting for CFM from responder"); } var cfmUdpData = await Engine.WaitForUdpResponseAsync(new PendingLowLevelUdpRequest("cfm 12358", destinationPeer.RemoteEndpoint, InviteConfirmationPacket.GetScanner(logger, req, destinationPeer), Engine.DateTimeNowUtc, Engine.Configuration.CfmTimoutS )); if (cfmUdpData == null) { throw new DrpTimeoutException($"inv. proxy CFM response from destination peer {destinationPeer} (timeout={Engine.Configuration.CfmTimoutS}s)"); } var cfm = InviteConfirmationPacket.Decode(cfmUdpData); // todo verify signature, update RDRs and QoS if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"verified CFM from responder"); } // respond NPACK to CFM to destination peer SendNeighborPeerAckResponseToCfm(cfm, destinationPeer); // send CFM to requester var cfmUdpDataTx = cfm.Encode_SetP2pFields(routedRequest.ReceivedFromNeighborNullable); if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"sending CFM to requester, waiting for NPACK"); } await Engine.OptionallySendUdpRequestAsync_Retransmit_WaitForNeighborPeerAck("cfm 23468", cfmUdpDataTx, routedRequest.ReceivedFromEndpoint, cfm.ReqP2pSeq16, routedRequest.ReceivedFromNeighborNullable, cfm.GetSignedFieldsForNeighborHMAC); if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"received NPACK to CFM from source peer"); } } catch (DrpTimeoutException exc) { logger.WriteToLog_lightPain($"could not proxy INVITE: {exc.Message}"); } catch (Exception exc) { logger.WriteToLog_mediumPain($"could not proxy INVITE request: {exc}"); } finally { _pendingInviteRequests.Remove(req.RequesterRegistrationId); } return(false); }
/// <summary> /// main register responder proc for both A-EP and P2P modes /// in P2P mode NeighborToken32 and NeighborHMAC are verified at this time /// </summary> /// <param name="receivedFromInP2pMode"> /// is null in A-EP mode /// </param> /// <returns> /// true to retry the request with another neighbor (if the request needs to be "rerouted") /// </returns> internal async Task <bool> ProxyRegisterRequestAsync(RoutedRequest routedRequest, ConnectionToNeighbor destinationPeer) // engine thread { routedRequest.ReceivedFromNeighborNullable?.AssertIsNotDisposed(); var req = routedRequest.RegisterReq; var logger = routedRequest.Logger; logger.ModuleName = VisionChannelModuleName_reg_proxySide; if (!ValidateReceivedReqTimestamp64(req.ReqTimestamp64)) { logger.WriteToLog_needsAttention($"rejecting REGISTER request {req.RequesterRegistrationId}: invalid REGISTER REQ 457 ReqTimestamp64={MiscProcedures.Int64ticksToDateTime(req.ReqTimestamp64)}"); // await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_numberOfHopsRemainingReachedZero); return(false); } if (PendingRegisterRequestExists(req.RequesterRegistrationId)) { logger.WriteToLog_higherLevelDetail($"rejecting duplicate request {req}: requesterEndpoint={routedRequest.ReceivedFromEndpoint}"); await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_routeIsUnavailable); return(false); } if (req.NumberOfHopsRemaining > RegisterRequestPacket.MaxNumberOfHopsRemaining || req.NumberOfRandomHopsRemaining > RegisterRequestPacket.MaxNumberOfHopsRemaining) { logger.WriteToLog_needsAttention($"rejecting {req}: invalid number of hops remaining"); await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_routeIsUnavailable); return(false); } if (!routedRequest.CheckedRecentUniqueProxiedRequests) { var recentUniqueProxiedRegistrationRequests = req.RandomModeAtThisHop ? RecentUniqueProxiedRegistrationRequests_RandomHop : RecentUniqueProxiedRegistrationRequests_NonRandomHop; if (!recentUniqueProxiedRegistrationRequests.Filter(req.GetUniqueRequestIdFields)) { logger.WriteToLog_higherLevelDetail($"rejecting non-unique request {req}: requesterEndpoint={routedRequest.ReceivedFromEndpoint}"); await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_routeIsUnavailable); return(false); } routedRequest.CheckedRecentUniqueProxiedRequests = true; } logger.WriteToLog_higherLevelDetail($"proxying {req}: requesterEndpoint={routedRequest.ReceivedFromEndpoint}, NumberOfHopsRemaining={req.NumberOfHopsRemaining}, ReqP2pSeq16={req.ReqP2pSeq16}, destinationPeer={destinationPeer}, sourcePeer={routedRequest.ReceivedFromNeighborNullable}"); if (!ValidateReceivedReqTimestamp64(req.ReqTimestamp64)) { throw new BadSignatureException($"invalid REGISTER REQ ReqTimestamp64={MiscProcedures.Int64ticksToDateTime(req.ReqTimestamp64)} 3507"); } req.NumberOfHopsRemaining--; if (req.NumberOfHopsRemaining == 0) { logger.WriteToLog_needsAttention($"rejecting REGISTER request {req.RequesterRegistrationId}: max hops reached"); await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_numberOfHopsRemainingReachedZero); return(false); } _pendingRegisterRequests.Add(req.RequesterRegistrationId); try { // send NPACK to source peer if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"sending NPACK to REQ source peer (delay={routedRequest.ReqReceivedSw_ms}ms)"); } routedRequest.SendNeighborPeerAck_accepted_IfNotAlreadyReplied(); if (req.NumberOfRandomHopsRemaining >= 1) { req.NumberOfRandomHopsRemaining--; } if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"decremented number of hops in {req}: NumberOfHopsRemaining={req.NumberOfHopsRemaining}, NumberOfRandomHopsRemaining={req.NumberOfRandomHopsRemaining}"); } req.ReqP2pSeq16 = destinationPeer.GetNewRequestP2pSeq16_P2P(); byte[] ack1UdpData; try { var sentRequest = new SentRequest(this, logger, destinationPeer.RemoteEndpoint, destinationPeer, req.Encode_OptionallySignNeighborHMAC(destinationPeer), req.ReqP2pSeq16, RegisterAck1Packet.GetScanner(logger, req, destinationPeer)); // send (proxy) REQ to responder. wait for NPACK, verify NPACK.senderHMAC, retransmit REQ // wait for ACK1 from destination peer // verify NeighborHMAC // var ack1R = await sentRequest.SendRequestAsync_NoExc("ack1 34601"); ////////////////////////////////// new method ack1UdpData = await sentRequest.SendRequestAsync("ack1 34601"); // if (logger.WriteToLog_detail2_enabled) logger.WriteToLog_detail("got ACK1 result"); if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true) { logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 52460"); return(false); } if (destinationPeer?.IsDisposed == true) { logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 52460"); return(false); } //if (ack1R.ResponseCode != ResponseOrFailureCode.accepted) //{ // logger.WriteToLog_higherLevelDetail($"got response={ack1R.ResponseCode} from destination {destinationPeer}"); // if (ack1R.ResponseCode == ResponseOrFailureCode.failure_routeIsUnavailable) // req.NumberOfHopsRemaining++; // roll back previous decrement for a new trial // return true; // will retry //} //ack1UdpData = ack1R.UdpData; } catch (RequestRejectedException reqExc) { logger.WriteToLog_higherLevelDetail($"got exception: response={reqExc.ResponseCode} from destination {destinationPeer}"); if (reqExc.ResponseCode == ResponseOrFailureCode.failure_numberOfHopsRemainingReachedZero) { await routedRequest.SendErrorResponse(ResponseOrFailureCode.failure_numberOfHopsRemainingReachedZero); return(false); } if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true) { logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 35346232"); return(false); } if (reqExc.ResponseCode == ResponseOrFailureCode.failure_routeIsUnavailable) { req.NumberOfHopsRemaining++; // roll back previous decrement for a new trial } return(true); // will retry } catch (DrpTimeoutException exc) { logger.WriteToLog_higherLevelDetail($"got timeout error when requesting {destinationPeer}: {exc.Message}"); req.NumberOfHopsRemaining++; // roll back previous decrement for a new trial return(true); // will retry } catch (Exception reqExc) { logger.WriteToLog_mediumPain($"could not proxy REGISTER request: {reqExc}"); if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true) { logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 76897805"); return(false); } return(true); // will retry } var tr1 = CreateTracker("ack1 34601 2"); var ack1 = RegisterAck1Packet.DecodeAndOptionallyVerify(logger, ack1UdpData, req, null); if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"verified ACK1 from destination"); } // respond with NPACK SendNeighborPeerAckResponseToRegisterAck1(ack1, destinationPeer); // send ACK1 to source peer // wait for ACK / NPACK if (routedRequest.ReceivedFromNeighborNullable != null) { // P2P mode routedRequest.ReceivedFromNeighborNullable.AssertIsNotDisposed(); ack1.ReqP2pSeq16 = routedRequest.ReceivedFromNeighborNullable.GetNewRequestP2pSeq16_P2P(); } else { // A-EP mode ack1.RequesterEndpoint = routedRequest.ReceivedFromEndpoint; } var ack1UdpDataTx = ack1.Encode_OpionallySignNeighborHMAC(routedRequest.ReceivedFromNeighborNullable); var sourcePeerVisibleDescription = routedRequest.ReceivedFromNeighborNullable?.ToString() ?? routedRequest.ReceivedFromEndpoint.ToString(); var ack2Scanner = RegisterAck2Packet.GetScanner(logger, routedRequest.ReceivedFromNeighborNullable, req); tr1.Dispose(); byte[] ack2UdpData; if (routedRequest.ReceivedFromNeighborNullable == null) { // A-EP mode: wait for ACK2, retransmitting ACK1 if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"sending ACK1, waiting for ACK2"); } ack2UdpData = await OptionallySendUdpRequestAsync_Retransmit_WaitForResponse("ack2 12368", sourcePeerVisibleDescription, ack1UdpDataTx, routedRequest.ReceivedFromEndpoint, ack2Scanner); } else { // P2P mode: retransmit ACK1 until NPACK (via P2P); at same time wait for ACK2 if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"sending ACK1, awaiting for NPACK"); } _ = OptionallySendUdpRequestAsync_Retransmit_WaitForNeighborPeerAck("ack1 3686", ack1UdpDataTx, routedRequest.ReceivedFromEndpoint, ack1.ReqP2pSeq16, routedRequest.ReceivedFromNeighborNullable, ack1.GetSignedFieldsForNeighborHMAC); // not waiting for NPACK, wait for ACK2 if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"waiting for ACK2"); } ack2UdpData = await OptionallySendUdpRequestAsync_Retransmit_WaitForResponse("ack2 345209", sourcePeerVisibleDescription, null, routedRequest.ReceivedFromEndpoint, ack2Scanner); } if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"received ACK2"); } if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true) { logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 2345135"); return(false); } if (destinationPeer?.IsDisposed == true) { logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 2345135"); return(false); } var ack2 = RegisterAck2Packet.Decode_OptionallyVerify_InitializeP2pStreamAtResponder(logger, ack2UdpData, null, null, null); // send NPACK to source peer if (logger.WriteToLog_detail_enabled) { logger.WriteToLog_detail($"sending NPACK to ACK2 to source peer"); } SendNeighborPeerAckResponseToRegisterAck2(ack2, routedRequest.ReceivedFromEndpoint, routedRequest.ReceivedFromNeighborNullable); // send ACK2 to destination peer // put ACK2.ReqP2pSeq16, sendertoken32, senderHMAC // wait for NPACK if (destinationPeer.IsDisposed == true) { logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 345784567"); return(false); } if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true) { logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 345784567"); return(false); } ack2.ReqP2pSeq16 = destinationPeer.GetNewRequestP2pSeq16_P2P(); await destinationPeer.SendUdpRequestAsync_Retransmit_WaitForNPACK("ack2 41937", ack2.Encode_OptionallySignNeighborHMAC(destinationPeer), ack2.ReqP2pSeq16, ack2.GetSignedFieldsForNeighborHMAC); if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true) { logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 234646"); return(false); } if (destinationPeer?.IsDisposed == true) { logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 234646"); return(false); } // wait for CFM from source peer var cfmUdpData = await OptionallySendUdpRequestAsync_Retransmit_WaitForResponse("cfm 234789", sourcePeerVisibleDescription, null, routedRequest.ReceivedFromEndpoint, RegisterConfirmationPacket.GetScanner(logger, routedRequest.ReceivedFromNeighborNullable, req) ); var cfm = RegisterConfirmationPacket.DecodeAndOptionallyVerify(cfmUdpData, null, null); if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true) { logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 3452326"); return(false); } if (destinationPeer?.IsDisposed == true) { logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 3452326"); return(false); } // TODO verify signatures and update QoS // send NPACK to source peer SendNeighborPeerAckResponseToRegisterCfm(cfm, routedRequest.ReceivedFromEndpoint, routedRequest.ReceivedFromNeighborNullable); // send CFM to responder // wait for NPACK from destination peer, retransmit if (destinationPeer.IsDisposed == true) { logger.WriteToLog_needsAttention($"destinationPeer={destinationPeer} is disposed during proxying 123678"); return(false); } if (routedRequest.ReceivedFromNeighborNullable?.IsDisposed == true) { logger.WriteToLog_needsAttention($"sourcePeer={routedRequest.ReceivedFromNeighborNullable} is disposed during proxying 123678"); return(false); } cfm.ReqP2pSeq16 = destinationPeer.GetNewRequestP2pSeq16_P2P(); await destinationPeer.SendUdpRequestAsync_Retransmit_WaitForNPACK("cfm 1357", cfm.Encode_OptionallySignNeighborHMAC(destinationPeer), cfm.ReqP2pSeq16, cfm.GetSignedFieldsForNeighborHMAC); logger.WriteToLog_higherLevelDetail($"proxying {req} is successfully complete"); } catch (DrpTimeoutException exc) { logger.WriteToLog_lightPain($"could not proxy REGISTER: request timeout: {exc.Message}"); } catch (Exception exc) { logger.WriteToLog_mediumPain($"could not proxy REGISTER request: {exc}"); } finally { _pendingRegisterRequests.Remove(req.RequesterRegistrationId); } return(false); }