/// <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($"could not proxy REGISTER request: {exc}");
}
finally
{
_pendingRegisterRequests.Remove(req.RequesterRegistrationId);
}
return(false);
}
/// <summary>
/// sends INVITE, autenticates users, returns Session to be used to create direct cannel
/// </summary>
/// <param name="responderUserId">
/// comes from local contact book
/// </param>
/// <param name="responderRegId">
/// comes from local contact book
/// </param>
/// <param name="loggerCb">may be invoked more than one time (in case of retrying)</param>
public async Task <InviteSession> SendInviteAsync(UserCertificate requesterUserCertificate, RegistrationId responderRegistrationId, UserId responderUserId,
SessionType sessionType, Action <Logger> loggerCb = null)
{
InviteSession session = null;
try
{
var sw = Stopwatch.StartNew();
RoutedRequest routedRequest = null;
int trialsCount = 0;
Exception latestTriedNeighborException = null;
_retry:
trialsCount++;
session = new InviteSession(this);
var req = new InviteRequestPacket
{
NumberOfHopsRemaining = InviteRequestPacket.MaxNumberOfHopsRemaining,
RequesterEcdhePublicKey = new EcdhPublicKey(session.LocalInviteAckEcdhePublicKey),
RequesterRegistrationId = this.Configuration.LocalPeerRegistrationId,
ResponderRegistrationId = responderRegistrationId,
ReqTimestamp32S = Engine.Timestamp32S,
};
var logger = new Logger(Engine, this, req, DrpPeerEngine.VisionChannelModuleName_inv_requesterSide);
if (!Engine.RecentUniqueInviteRequests.Filter(req.GetUniqueRequestIdFields))
{
if (trialsCount > 50)
{
throw new NonUniquePacketFieldsException($"could not find unique fields to send INVITE request");
}
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"waiting a second to generate ne wunique INVITE request");
}
await Engine.EngineThreadQueue.WaitAsync(TimeSpan.FromSeconds(1), "inv_wait_1236");
goto _retry;
}
session.Logger = logger;
loggerCb?.Invoke(logger);
Engine.RecentUniquePublicEcdhKeys.AssertIsUnique(req.RequesterEcdhePublicKey.Ecdh25519PublicKey, "req.RequesterEcdhePublicKey");
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"generated unique ECDH key {req.RequesterEcdhePublicKey}");
}
req.RequesterRegistrationSignature = RegistrationSignature.Sign(Engine.CryptoLibrary, req.GetSharedSignedFields, this.Configuration.LocalPeerRegistrationPrivateKey);
this.TestDirection(logger, req.ResponderRegistrationId);
routedRequest = new RoutedRequest(logger, null, null, null, req, null, routedRequest);
// find best connected peer to send the request
var destinationPeer = Engine.RouteInviteRequest(this, routedRequest);
if (destinationPeer == null)
{
if (latestTriedNeighborException == null)
{
throw new NoNeighborsToSendInviteException();
}
else
{
throw latestTriedNeighborException;
}
}
InviteAck1Packet ack1;
try
{
var reqUdpData = req.Encode_SetP2pFields(destinationPeer);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending {req} (ReqTimestamp32S={MiscProcedures.Uint32secondsToDateTime(req.ReqTimestamp32S)}), waiting for NPACK");
}
var sentRequest = new SentRequest(Engine, logger, destinationPeer.RemoteEndpoint, destinationPeer, reqUdpData, req.ReqP2pSeq16, InviteAck1Packet.GetScanner(logger, req, destinationPeer));
var ack1UdpData = await sentRequest.SendRequestAsync("ack1 4146");
#region process ACK1
// NeighborHMAC and NeighborToken32 are already verified by scanner
ack1 = InviteAck1Packet.Decode(ack1UdpData);
Engine.RecentUniquePublicEcdhKeys.AssertIsUnique(ack1.ResponderEcdhePublicKey.Ecdh25519PublicKey, $"ack1.ResponderEcdhePublicKey");
if (!ack1.ResponderRegistrationSignature.Verify(Engine.CryptoLibrary, w =>
{
req.GetSharedSignedFields(w);
ack1.GetSharedSignedFields(w, true);
},
responderRegistrationId))
{
throw new BadSignatureException("invalid REGISTER ACK1 ResponderRegistrationSignature 2349");
}
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"verified ACK1");
}
session.DeriveSharedInviteAckDhSecret(Engine.CryptoLibrary, ack1.ResponderEcdhePublicKey.Ecdh25519PublicKey);
// send NPACK to ACK1
SendNeighborPeerAckResponseToAck1(ack1, destinationPeer);
#endregion
}
catch (RequestFailedException exc2)
{
latestTriedNeighborException = exc2;
if (trialsCount > 50)
{
throw;
}
logger.WriteToLog_higherLevelDetail($"trying again on error {exc2.Message}... alreadyTriedProxyingToDestinationPeers.Count={routedRequest.TriedNeighbors.Count}");
routedRequest.TriedNeighbors.Add(destinationPeer);
goto _retry;
}
// decode and verify SD
session.RemoteSessionDescription = InviteSessionDescription.Decrypt_Verify(Engine.CryptoLibrary,
ack1.ToResponderSessionDescriptionEncrypted,
req, ack1, false, session,
responderUserId, Engine.DateTimeNowUtc);
// sign and encode local SD
session.LocalSessionDescription = new InviteSessionDescription
{
DirectChannelEndPoint = destinationPeer.LocalEndpoint,
SessionType = sessionType,
DirectChannelToken32 = session.LocalDirectChannelToken32
};
session.LocalSessionDescription.UserCertificate = requesterUserCertificate;
session.LocalSessionDescription.UserCertificateSignature = UserCertificateSignature.Sign(Engine.CryptoLibrary,
w =>
{
req.GetSharedSignedFields(w);
ack1.GetSharedSignedFields(w, true);
session.LocalSessionDescription.WriteSignedFields(w);
},
requesterUserCertificate
);
#region send ack2
var ack2 = new InviteAck2Packet
{
RequesterRegistrationId = req.RequesterRegistrationId,
ResponderRegistrationId = req.ResponderRegistrationId,
ReqTimestamp32S = req.ReqTimestamp32S,
ToRequesterSessionDescriptionEncrypted = session.LocalSessionDescription.Encrypt(Engine.CryptoLibrary, req, ack1, session, true)
};
ack2.RequesterRegistrationSignature = RegistrationSignature.Sign(Engine.CryptoLibrary, w =>
{
req.GetSharedSignedFields(w);
ack1.GetSharedSignedFields(w, true);
ack2.GetSharedSignedFields(w);
}, this.Configuration.LocalPeerRegistrationPrivateKey);
var ack2UdpData = ack2.Encode_SetP2pFields(destinationPeer);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending ACK2, waiting for NPACK");
}
await destinationPeer.SendUdpRequestAsync_Retransmit_WaitForNPACK("ack2 234575672", ack2UdpData, ack2.ReqP2pSeq16, ack2.GetSignedFieldsForNeighborHMAC);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"received NPACK");
}
#endregion
#region wait for CFM
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"waiting for CFM");
}
var cfmUdpData = await Engine.WaitForUdpResponseAsync(new PendingLowLevelUdpRequest("cfm 1235695", destinationPeer.RemoteEndpoint,
InviteConfirmationPacket.GetScanner(logger, req, destinationPeer),
Engine.DateTimeNowUtc, Engine.Configuration.CfmTimoutS
));
if (cfmUdpData == null)
{
throw new DrpTimeoutException($"did not get CFM at invite requester from destination peer {destinationPeer} (timeout={Engine.Configuration.CfmTimoutS}s)");
}
// NeighborHMAC and NeighborToken32 are already verified by scanner
var cfm = InviteConfirmationPacket.Decode(cfmUdpData);
if (!cfm.ResponderRegistrationSignature.Verify(Engine.CryptoLibrary, w =>
{
req.GetSharedSignedFields(w);
ack1.GetSharedSignedFields(w, true);
ack2.GetSharedSignedFields(w);
},
responderRegistrationId))
{
throw new BadSignatureException("invalid REGISTER CFM ResponderRegistrationSignature 6398");
}
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"verified CFM");
}
// send NPACK to CFM
SendNeighborPeerAckResponseToCfm(cfm, destinationPeer);
#endregion
session.DeriveSharedPingPongHmacKey(req, ack1, ack2, cfm);
return(session);
}
catch
{
session?.Dispose();
throw;
}
}
/// <summary>
/// is used to expand neighborhood
/// </summary>
internal async Task RegisterAsync(uint minimalDistanceToNeighbor, ushort busySectorIds, byte numberOfHopsRemaining, byte numberOfRandomHopsRemaining, double[] directionVectorNullable, bool allowConnectionsToRequesterRegistrationId)
{
_engine.WriteToLog_reg_requesterSide_detail($">> ConnectionToNeighbor.RegisterAsync(minimalDistanceToNeighbor={minimalDistanceToNeighbor}", null, null);
_localDrpPeer.CurrentRegistrationOperationsCount++;
try
{
var newConnectionToNeighbor = new ConnectionToNeighbor(_engine, _localDrpPeer, ConnectedDrpPeerInitiatedBy.localPeer, null);
PongPacket pong;
// PendingLowLevelUdpRequest pendingPingRequest;
var req = new RegisterRequestPacket
{
RequesterRegistrationId = _localDrpPeer.Configuration.LocalPeerRegistrationId,
ReqTimestamp64 = _engine.Timestamp64,
MinimalDistanceToNeighbor = minimalDistanceToNeighbor,
RequesterNatBehaviour = _engine.LocalNatBehaviour,
AllowConnectionsToRequesterRegistrationId = allowConnectionsToRequesterRegistrationId,
RequesterNeighborsBusySectorIds = busySectorIds,
NumberOfHopsRemaining = numberOfHopsRemaining,
NumberOfRandomHopsRemaining = numberOfRandomHopsRemaining,
RequesterEcdhePublicKey = new EcdhPublicKey(newConnectionToNeighbor.LocalEcdhe25519PublicKey),
ReqP2pSeq16 = GetNewRequestP2pSeq16_P2P(),
EpEndpoint = this.RemoteEndpoint,
DirectionVectorNullableD = directionVectorNullable
};
var logger = new Logger(Engine, LocalDrpPeer, req, DrpPeerEngine.VisionChannelModuleName_reg_requesterSide);
try
{
_engine.RecentUniquePublicEcdhKeys.AssertIsUnique(req.RequesterEcdhePublicKey.Ecdh25519PublicKey, $"req.RequesterEcdhePublicKey {req}");
req.RequesterSignature = RegistrationSignature.Sign(_engine.CryptoLibrary,
w => req.GetSharedSignedFields(w, false),
_localDrpPeer.Configuration.LocalPeerRegistrationPrivateKey
);
var reqToAck1Stopwatch = Stopwatch.StartNew();
#region wait for ACK1, respond with NPACK
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending {req}, waiting for NPACK. ReqP2pSeq16={req.ReqP2pSeq16}");
}
var sentRequest = new SentRequest(Engine, logger, this.RemoteEndpoint, this, req.Encode_OptionallySignNeighborHMAC(this),
req.ReqP2pSeq16, RegisterAck1Packet.GetScanner(logger, req, this));
var ack1UdpData = await sentRequest.SendRequestAsync("reg req ack1 42084");
var ack1 = RegisterAck1Packet.DecodeAndOptionallyVerify(logger, ack1UdpData, req, newConnectionToNeighbor);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"verified ACK1, sending NPACK to ACK1");
}
_engine.SendNeighborPeerAckResponseToRegisterAck1(ack1, this);
#endregion
if (newConnectionToNeighbor.IsDisposed)
{
logger.WriteToLog_needsAttention($"connection {newConnectionToNeighbor} is disposed during reg. request 5345322345");
return;
}
if (IsDisposed)
{
logger.WriteToLog_needsAttention($"connection {this} is disposed during reg. request 5345322345");
return;
}
_engine.RecentUniquePublicEcdhKeys.AssertIsUnique(ack1.ResponderEcdhePublicKey.Ecdh25519PublicKey, $"ack1.ResponderEcdhePublicKey from {newConnectionToNeighbor}");
newConnectionToNeighbor.LocalEndpoint = this.LocalEndpoint;
newConnectionToNeighbor.RemoteRegistrationId = ack1.ResponderRegistrationId;
reqToAck1Stopwatch.Stop();
var reqToAck1TimeMs = reqToAck1Stopwatch.Elapsed.TotalMilliseconds;
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"measured REQ-ACK1 RTT = {(int)reqToAck1TimeMs}ms");
}
#region send ACK2, encode local IP
var ack2 = new RegisterAck2Packet
{
ReqTimestamp64 = req.ReqTimestamp64,
RequesterRegistrationId = _localDrpPeer.Configuration.LocalPeerRegistrationId,
ReqP2pSeq16 = GetNewRequestP2pSeq16_P2P(),
};
ack2.ToRequesterTxParametersEncrypted = newConnectionToNeighbor.Encrypt_ack2_ToRequesterTxParametersEncrypted_AtRequester(logger, req, ack1, ack2);
newConnectionToNeighbor.InitializeP2pStream(req, ack1, ack2);
ack2.RequesterSignature = RegistrationSignature.Sign(_engine.CryptoLibrary, w =>
{
req.GetSharedSignedFields(w, true);
ack1.GetSharedSignedFields(w, true, true);
ack2.GetSharedSignedFields(w, false, true);
},
_localDrpPeer.Configuration.LocalPeerRegistrationPrivateKey
);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending ACK2 (in response to ACK1), waiting for NPACK");
}
await _engine.OptionallySendUdpRequestAsync_Retransmit_WaitForNeighborPeerAck("ack2 1235739", ack2.Encode_OptionallySignNeighborHMAC(this), this.RemoteEndpoint, ack2.ReqP2pSeq16);
#endregion
var neighborWaitTimeMs = reqToAck1TimeMs * 0.5 - 100; if (neighborWaitTimeMs < 0)
{
neighborWaitTimeMs = 0;
}
if (neighborWaitTimeMs > 20)
{
await _engine.EngineThreadQueue.WaitAsync(TimeSpan.FromMilliseconds(neighborWaitTimeMs), "neighborWaitTimeMs45236"); // wait until the ACK2 reaches neighbor N via peers
}
if (newConnectionToNeighbor.IsDisposed)
{
logger.WriteToLog_needsAttention($"connection {newConnectionToNeighbor} is disposed during reg. request 234574568");
return;
}
if (IsDisposed)
{
logger.WriteToLog_needsAttention($"connection {this} is disposed during reg. request 234574568");
return;
}
_localDrpPeer.AddToConnectedNeighbors(newConnectionToNeighbor, req);
#region send ping request directly to neighbor N, retransmit
var pingRequest = newConnectionToNeighbor.CreatePing(true, false, _localDrpPeer.ConnectedNeighborsBusySectorIds, _localDrpPeer.AnotherNeighborToSameSectorExists(newConnectionToNeighbor));
newConnectionToNeighbor.InitialPendingPingRequest = new PendingLowLevelUdpRequest("pendingPingRequest 12247", newConnectionToNeighbor.RemoteEndpoint,
PongPacket.GetScanner(newConnectionToNeighbor.LocalNeighborToken32, pingRequest.PingRequestId32),
_engine.DateTimeNowUtc,
_engine.Configuration.InitialPingRequests_ExpirationTimeoutS,
pingRequest.Encode(),
_engine.Configuration.InitialPingRequests_InitialRetransmissionTimeoutS,
_engine.Configuration.InitialPingRequests_RetransmissionTimeoutIncrement
);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending PING, waiting for PONG");
}
var pongPacketData = await _engine.SendUdpRequestAsync_Retransmit(newConnectionToNeighbor.InitialPendingPingRequest);
if (pongPacketData == null)
{
throw new DrpTimeoutException($"reg. requester initial PING to {newConnectionToNeighbor} (timeout={_engine.Configuration.InitialPingRequests_ExpirationTimeoutS}s)");
}
if (newConnectionToNeighbor.IsDisposed)
{
logger.WriteToLog_needsAttention($"connection {newConnectionToNeighbor} is disposed during reg. request 548798");
return;
}
if (IsDisposed)
{
logger.WriteToLog_needsAttention($"connection {this} is disposed during reg. request 548798");
return;
}
pong = PongPacket.DecodeAndVerify(_engine.CryptoLibrary,
pongPacketData, pingRequest, newConnectionToNeighbor,
true);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"verified PONG");
}
newConnectionToNeighbor.OnReceivedVerifiedPong(pong, newConnectionToNeighbor.InitialPendingPingRequest.ResponseReceivedAtUtc.Value,
newConnectionToNeighbor.InitialPendingPingRequest.ResponseReceivedAtUtc.Value - newConnectionToNeighbor.InitialPendingPingRequest.InitialTxTimeUTC.Value);
#endregion
}
catch
{
// todo update QoS
newConnectionToNeighbor.Dispose(); // remove from token32 table
throw;
}
#region send registration confirmation packet to X->N
try
{
if (newConnectionToNeighbor.IsDisposed)
{
logger.WriteToLog_needsAttention($"connection {newConnectionToNeighbor} is disposed during reg. request 541687987");
return;
}
if (IsDisposed)
{
logger.WriteToLog_needsAttention($"connection {this} is disposed during reg. request 541687987");
return;
}
var cfm = new RegisterConfirmationPacket
{
ReqTimestamp64 = req.ReqTimestamp64,
RequesterRegistrationId = _localDrpPeer.Configuration.LocalPeerRegistrationId,
ResponderRegistrationConfirmationSignature = pong.ResponderRegistrationConfirmationSignature,
ReqP2pSeq16 = GetNewRequestP2pSeq16_P2P()
};
cfm.RequesterRegistrationConfirmationSignature = RegistrationSignature.Sign(_engine.CryptoLibrary,
w => newConnectionToNeighbor.GetRequesterRegistrationConfirmationSignatureFields(w, cfm.ResponderRegistrationConfirmationSignature),
_localDrpPeer.Configuration.LocalPeerRegistrationPrivateKey);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending CFM, waiting for NPACK");
}
await _engine.OptionallySendUdpRequestAsync_Retransmit_WaitForNeighborPeerAck("cfm 14478", cfm.Encode_OptionallySignNeighborHMAC(this), this.RemoteEndpoint, cfm.ReqP2pSeq16);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"received NPACK to CFM");
}
}
catch (DrpTimeoutException exc)
{ // we ingnore exceptions here, just wite warning to log. the connection is alive already, as direct ping channel to neighbor is set up
logger.WriteToLog_needsAttention($"... registration confirmation request failed: {exc}");
}
catch (Exception exc)
{ // we ingnore exceptions here, just wite warning to log. the connection is alive already, as direct ping channel to neighbor is set up
logger.WriteToLog_mediumPain($"... registration confirmation request failed: {exc}");
}
#endregion
return;// newConnectionToNeighbor;
}
finally
{
_localDrpPeer.CurrentRegistrationOperationsCount--;
}
}
/// <returns>null if registration failed with timeout or some error code</returns>
public async Task <ConnectionToNeighbor> RegisterAsync(LocalDrpPeer localDrpPeer, IPEndPoint epEndpoint, uint minimalDistanceToNeighbor,
byte numberofHops, double[] directionVectorNullable, bool allowConnectionsToRequesterRegistrationId) // engine thread
{
var regSW = Stopwatch.StartNew();
WriteToLog_reg_requesterSide_higherLevelDetail($"connecting via EntryPeer {epEndpoint}", null, null);
localDrpPeer.CurrentRegistrationOperationsCount++;
try
{
#region PoW1
RegisterPow1ResponsePacket pow1ResponsePacket = null;
if (!Configuration.SandboxModeOnly_DisablePoW)
{
WriteToLog_reg_requesterSide_detail($"generating PoW1 request", null, null);
var pow1SW = Stopwatch.StartNew();
await PowThreadQueue.EnqueueAsync("pow1 6318");
WriteToLog_reg_requesterSide_detail($"generating PoW1 request @pow thread", null, null);
var registerPow1RequestPacket = GenerateRegisterPow1RequestPacket(localDrpPeer.PublicIpApiProviderResponse.GetAddressBytes(), Timestamp32S);
await EngineThreadQueue.EnqueueAsync("pow1 234709");
WriteToLog_reg_requesterSide_detail($"generated PoW1 request @engine thread", null, null);
// send register pow1 request
if (pow1SW.Elapsed.TotalMilliseconds > 3000)
{
WriteToLog_reg_requesterSide_lightPain($"PoW1 took {(int)pow1SW.Elapsed.TotalMilliseconds}ms", null, null);
}
WriteToLog_reg_requesterSide_detail($"PoW1 took {(int)pow1SW.Elapsed.TotalMilliseconds}ms. sending PoW1 request", null, null);
var rpPow1ResponsePacketData = await SendUdpRequestAsync_Retransmit(
new PendingLowLevelUdpRequest("rpPow1 469", epEndpoint,
RegisterPow1ResponsePacket.GetScanner(registerPow1RequestPacket.Pow1RequestId),
DateTimeNowUtc,
Configuration.UdpLowLevelRequests_ExpirationTimeoutS,
registerPow1RequestPacket.Encode(),
Configuration.UdpLowLevelRequests_InitialRetransmissionTimeoutS,
Configuration.UdpLowLevelRequests_RetransmissionTimeoutIncrement
));
// wait for response, retransmit
if (rpPow1ResponsePacketData == null)
{
throw new DrpTimeoutException($"pow1 request to EP '{epEndpoint}' (timeout={Configuration.UdpLowLevelRequests_ExpirationTimeoutS}s)");
}
;
pow1ResponsePacket = new RegisterPow1ResponsePacket(rpPow1ResponsePacketData);
WriteToLog_reg_requesterSide_detail($"got PoW1 response with status={pow1ResponsePacket.StatusCode}", null, null);
if (pow1ResponsePacket.StatusCode != RegisterPow1ResponseStatusCode.succeeded_Pow2Challenge)
{
throw new Pow1RejectedException(pow1ResponsePacket.StatusCode);
}
}
#endregion
var newConnectionToNeighbor = new ConnectionToNeighbor(this, localDrpPeer, ConnectedDrpPeerInitiatedBy.localPeer, null);
PongPacket pong;
var req = new RegisterRequestPacket
{
RequesterRegistrationId = localDrpPeer.Configuration.LocalPeerRegistrationId,
ReqTimestamp64 = Timestamp64,
MinimalDistanceToNeighbor = minimalDistanceToNeighbor,
RequesterNatBehaviour = LocalNatBehaviour,
AllowConnectionsToRequesterRegistrationId = allowConnectionsToRequesterRegistrationId,
NumberOfHopsRemaining = numberofHops,
RequesterEcdhePublicKey = new EcdhPublicKey(newConnectionToNeighbor.LocalEcdhe25519PublicKey),
ReqP2pSeq16 = GetNewNpaSeq16_AtoEP(),
EpEndpoint = epEndpoint,
DirectionVectorNullableD = directionVectorNullable
};
var logger = new Logger(this, localDrpPeer, req, VisionChannelModuleName_reg_requesterSide);
try
{
#region register REQ PoW2
RecentUniquePublicEcdhKeys.AssertIsUnique(req.RequesterEcdhePublicKey.Ecdh25519PublicKey, $"req.RequesterEcdhePublicKey {req}"); // this is used in non-standard way when routing registration requests to same (local) reg. ID, too
var pow2SW = Stopwatch.StartNew();
if (!Configuration.SandboxModeOnly_DisablePoW)
{
await PowThreadQueue.EnqueueAsync("pow2 23465");
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"calculating PoW2 @pow thread");
}
GenerateRegisterReqPow2(req, pow1ResponsePacket.ProofOfWork2Request);
await EngineThreadQueue.EnqueueAsync("pow2 2496");
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"calculated PoW2 @engine thread");
}
}
else
{
req.ProofOfWork2 = new byte[64];
}
pow2SW.Stop();
if (pow2SW.Elapsed.TotalMilliseconds > 3000)
{
logger.WriteToLog_lightPain($"PoW2 took {(int)pow2SW.Elapsed.TotalMilliseconds}ms");
}
req.RequesterSignature = RegistrationSignature.Sign(_cryptoLibrary,
w => req.GetSharedSignedFields(w, false),
localDrpPeer.Configuration.LocalPeerRegistrationPrivateKey
);
var reqToAck1Stopwatch = Stopwatch.StartNew();
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"PoW2 took {(int)pow2SW.Elapsed.TotalMilliseconds}ms. sending REQ, waiting for NPACK. ReqP2pSeq16={req.ReqP2pSeq16}");
}
#endregion
// var reqSW = Stopwatch.StartNew();
#region wait for ACK1
var sentRequest = new SentRequest(this, logger, epEndpoint, null, req.Encode_OptionallySignNeighborHMAC(null), req.ReqP2pSeq16, RegisterAck1Packet.GetScanner(logger, req));
var ack1UdpData = await sentRequest.SendRequestAsync("reg req ack1 367097");
var ack1 = RegisterAck1Packet.DecodeAndOptionallyVerify(logger, ack1UdpData, req, newConnectionToNeighbor);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"verified ACK1. RequesterEndpoint={ack1.RequesterEndpoint}");
}
#endregion
// check if it matches to previously known local public IP
if (ack1.RequesterEndpoint.Address.Equals(localDrpPeer.PublicIpApiProviderResponse) == false)
{
// MITM attack / EP sent local (requester) endpoint IP some bad IP address
throw new PossibleAttackException();
}
RecentUniquePublicEcdhKeys.AssertIsUnique(ack1.ResponderEcdhePublicKey.Ecdh25519PublicKey, $"ack1.ResponderEcdhePublicKey from {epEndpoint}");
newConnectionToNeighbor.LocalEndpoint = ack1.RequesterEndpoint;
newConnectionToNeighbor.RemoteRegistrationId = ack1.ResponderRegistrationId;
reqToAck1Stopwatch.Stop();
var reqToAck1TimeMs = reqToAck1Stopwatch.Elapsed.TotalMilliseconds;
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"measured REQ-ACK1_RTT={(int)reqToAck1TimeMs}ms");
}
#region send ACK2, encode local IP
var ack2 = new RegisterAck2Packet
{
ReqTimestamp64 = req.ReqTimestamp64,
RequesterRegistrationId = localDrpPeer.Configuration.LocalPeerRegistrationId,
ReqP2pSeq16 = GetNewNpaSeq16_AtoEP()
};
ack2.ToRequesterTxParametersEncrypted = newConnectionToNeighbor.Encrypt_ack2_ToRequesterTxParametersEncrypted_AtRequester(logger, req, ack1, ack2);
newConnectionToNeighbor.InitializeP2pStream(req, ack1, ack2);
ack2.RequesterSignature = RegistrationSignature.Sign(_cryptoLibrary, w =>
{
req.GetSharedSignedFields(w, true);
ack1.GetSharedSignedFields(w, true, true);
ack2.GetSharedSignedFields(w, false, true);
},
localDrpPeer.Configuration.LocalPeerRegistrationPrivateKey
);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending ACK2 (in response to ACK1), waiting for NPACK");
}
RespondToRequestAndRetransmissions(ack1UdpData, ack2.Encode_OptionallySignNeighborHMAC(null), epEndpoint);
await OptionallySendUdpRequestAsync_Retransmit_WaitForNeighborPeerAck("ack2 46873", null, epEndpoint, ack2.ReqP2pSeq16);
#endregion
var neighborWaitTimeMs = reqToAck1TimeMs * 0.5 - 250; if (neighborWaitTimeMs < 0)
{
neighborWaitTimeMs = 0;
}
if (neighborWaitTimeMs > 20)
{
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"awaiting {(int)neighborWaitTimeMs}ms before PING...");
}
await EngineThreadQueue.WaitAsync(TimeSpan.FromMilliseconds(neighborWaitTimeMs), "before PING 34589"); // wait until the ACK2 reaches neighbor N via peers
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"... awaiting is complete");
}
}
localDrpPeer.AddToConnectedNeighbors(newConnectionToNeighbor, req);
#region send ping request directly to neighbor N, retransmit
var pingRequest = newConnectionToNeighbor.CreatePing(true, false, localDrpPeer.ConnectedNeighborsBusySectorIds, localDrpPeer.AnotherNeighborToSameSectorExists(newConnectionToNeighbor));
newConnectionToNeighbor.InitialPendingPingRequest = new PendingLowLevelUdpRequest("pingRequest 3850", newConnectionToNeighbor.RemoteEndpoint,
PongPacket.GetScanner(newConnectionToNeighbor.LocalNeighborToken32, pingRequest.PingRequestId32),
DateTimeNowUtc,
Configuration.InitialPingRequests_ExpirationTimeoutS,
pingRequest.Encode(),
Configuration.InitialPingRequests_InitialRetransmissionTimeoutS,
Configuration.InitialPingRequests_RetransmissionTimeoutIncrement
);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending PING neighborToken32={pingRequest.NeighborToken32}, waiting for PONG");
}
var pongPacketData = await SendUdpRequestAsync_Retransmit(newConnectionToNeighbor.InitialPendingPingRequest);
if (pongPacketData == null)
{
throw new DrpTimeoutException($"initial reg. requester PING to {newConnectionToNeighbor} (timeout={Configuration.InitialPingRequests_ExpirationTimeoutS}s)");
}
if (newConnectionToNeighbor.IsDisposed)
{
throw new ObjectDisposedException($"initial reg. requester PING to {newConnectionToNeighbor} (special case: connection is disposed)", (Exception)null); // ping timeout already destroyed the connection, so PONG response here is too late
}
pong = PongPacket.DecodeAndVerify(_cryptoLibrary,
pongPacketData, pingRequest, newConnectionToNeighbor,
true);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"verified PONG");
}
newConnectionToNeighbor.OnReceivedVerifiedPong(pong, newConnectionToNeighbor.InitialPendingPingRequest.ResponseReceivedAtUtc.Value,
newConnectionToNeighbor.InitialPendingPingRequest.ResponseReceivedAtUtc.Value - newConnectionToNeighbor.InitialPendingPingRequest.InitialTxTimeUTC.Value);
#endregion
}
catch
{
// todo update QoS
newConnectionToNeighbor.Dispose(); // remove from token32 table
throw;
}
#region send registration confirmation packet to EP->X->N
try
{
var cfm = new RegisterConfirmationPacket
{
ReqTimestamp64 = req.ReqTimestamp64,
RequesterRegistrationId = localDrpPeer.Configuration.LocalPeerRegistrationId,
ResponderRegistrationConfirmationSignature = pong.ResponderRegistrationConfirmationSignature,
ReqP2pSeq16 = GetNewNpaSeq16_AtoEP()
};
cfm.RequesterRegistrationConfirmationSignature = RegistrationSignature.Sign(_cryptoLibrary,
w => newConnectionToNeighbor.GetRequesterRegistrationConfirmationSignatureFields(w, cfm.ResponderRegistrationConfirmationSignature),
localDrpPeer.Configuration.LocalPeerRegistrationPrivateKey);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"sending CFM, waiting for NPACK");
}
await OptionallySendUdpRequestAsync_Retransmit_WaitForNeighborPeerAck("cfm 32107", cfm.Encode_OptionallySignNeighborHMAC(null), epEndpoint, cfm.ReqP2pSeq16);
if (logger.WriteToLog_detail_enabled)
{
logger.WriteToLog_detail($"received NPACK to CFM");
}
}
catch (DrpTimeoutException exc)
{ // we ingnore exceptions here, just wite warning to log. the connection is alive already, as direct ping channel to neighbor is set up
logger.WriteToLog_needsAttention($"... registration confirmation request failed: {exc}");
}
catch (Exception exc)
{ // we ingnore exceptions here, just wite warning to log. the connection is alive already, as direct ping channel to neighbor is set up
logger.WriteToLog_mediumPain($"... registration confirmation request failed: {exc}");
}
#endregion
regSW.Stop();
if (regSW.Elapsed.TotalMilliseconds > 5000)
{
logger.WriteToLog_lightPain($"registration is completed in {(int)regSW.Elapsed.TotalMilliseconds}ms");
}
else
{
logger.WriteToLog_higherLevelDetail($"registration is completed in {(int)regSW.Elapsed.TotalMilliseconds}ms");
};
return(newConnectionToNeighbor);
}
finally
{
localDrpPeer.CurrentRegistrationOperationsCount--;
}
}