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#include <service/outbound_context.hpp>
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#include <router/abstractrouter.hpp>
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#include <service/async_key_exchange.hpp>
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#include <service/hidden_service_address_lookup.hpp>
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#include <service/endpoint.hpp>
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#include <nodedb.hpp>
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#include <profiling.hpp>
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#include <util/meta/memfn.hpp>
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#include <random>
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#include <algorithm>
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namespace llarp
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{
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namespace service
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{
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bool
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OutboundContext::Stop()
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{
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markedBad = true;
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return path::Builder::Stop();
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}
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bool
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OutboundContext::IsDone(llarp_time_t now) const
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{
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(void)now;
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return AvailablePaths(path::ePathRoleAny) == 0 && ShouldRemove();
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}
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bool
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OutboundContext::ShouldBundleRC() const
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{
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return m_Endpoint->ShouldBundleRC();
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}
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bool
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OutboundContext::HandleDataDrop(path::Path_ptr p, const PathID_t& dst,
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uint64_t seq)
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{
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// pick another intro
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if(dst == remoteIntro.pathID && remoteIntro.router == p->Endpoint())
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{
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LogWarn(Name(), " message ", seq, " dropped by endpoint ",
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p->Endpoint(), " via ", dst);
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if(MarkCurrentIntroBad(Now()))
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{
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SwapIntros();
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}
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UpdateIntroSet(true);
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}
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return true;
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}
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OutboundContext::OutboundContext(const IntroSet& introset, Endpoint* parent)
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: path::Builder(parent->Router(), 4, path::default_len)
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, SendContext(introset.A, {}, this, parent)
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, currentIntroSet(introset)
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{
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updatingIntroSet = false;
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for(const auto& intro : introset.I)
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{
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if(intro.expiresAt > m_NextIntro.expiresAt)
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m_NextIntro = intro;
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}
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}
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OutboundContext::~OutboundContext() = default;
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/// actually swap intros
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void
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OutboundContext::SwapIntros()
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{
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if(remoteIntro != m_NextIntro)
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{
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LogInfo(Name(), " swap intro to use ", RouterID(m_NextIntro.router));
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remoteIntro = m_NextIntro;
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m_DataHandler->PutIntroFor(currentConvoTag, remoteIntro);
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ShiftIntroduction(false);
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}
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}
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bool
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OutboundContext::OnIntroSetUpdate(__attribute__((unused))
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const Address& addr,
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const IntroSet* i,
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const RouterID& endpoint)
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{
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if(markedBad)
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return true;
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updatingIntroSet = false;
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if(i)
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{
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if(currentIntroSet.T >= i->T)
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{
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LogInfo("introset is old, dropping");
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return true;
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}
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const llarp_time_t now = Now();
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if(i->IsExpired(now))
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{
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LogError("got expired introset from lookup from ", endpoint);
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return true;
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}
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currentIntroSet = *i;
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}
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else
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{
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++m_LookupFails;
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LogWarn(Name(), " failed to look up introset, fails=", m_LookupFails);
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}
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return true;
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}
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bool
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OutboundContext::ReadyToSend() const
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{
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return (!remoteIntro.router.IsZero())
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&& GetPathByRouter(remoteIntro.router) != nullptr;
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}
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void
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OutboundContext::ShiftIntroRouter(const RouterID r)
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{
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const auto now = Now();
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Introduction selectedIntro;
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for(const auto& intro : currentIntroSet.I)
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{
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if(intro.expiresAt > selectedIntro.expiresAt && intro.router != r)
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{
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selectedIntro = intro;
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}
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}
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if(selectedIntro.router.IsZero() || selectedIntro.ExpiresSoon(now))
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return;
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LogWarn(Name(), " shfiting intro off of ", r, " to ",
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RouterID(selectedIntro.router));
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m_NextIntro = selectedIntro;
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}
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void
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OutboundContext::HandlePathBuildTimeout(path::Path_ptr p)
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{
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ShiftIntroRouter(p->Endpoint());
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path::Builder::HandlePathBuildTimeout(p);
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}
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void
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OutboundContext::HandlePathBuilt(path::Path_ptr p)
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{
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path::Builder::HandlePathBuilt(p);
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/// don't use it if we are marked bad
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if(markedBad)
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return;
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p->SetDataHandler(
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util::memFn(&OutboundContext::HandleHiddenServiceFrame, this));
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p->SetDropHandler(util::memFn(&OutboundContext::HandleDataDrop, this));
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// we now have a path to the next intro, swap intros
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if(p->Endpoint() == m_NextIntro.router)
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SwapIntros();
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else
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{
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LogInfo(Name(), " built to non aligned router: ", p->Endpoint());
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}
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}
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void
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OutboundContext::AsyncGenIntro(const llarp_buffer_t& payload,
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ProtocolType t)
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{
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if(not currentConvoTag.IsZero())
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return;
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if(remoteIntro.router.IsZero())
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SwapIntros();
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auto path = m_PathSet->GetNewestPathByRouter(remoteIntro.router);
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if(path == nullptr)
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{
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// try parent as fallback
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path = m_Endpoint->GetPathByRouter(remoteIntro.router);
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if(path == nullptr)
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{
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if(!BuildCooldownHit(Now()))
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BuildOneAlignedTo(remoteIntro.router);
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LogWarn(Name(), " dropping intro frame, no path to ",
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remoteIntro.router);
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return;
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}
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}
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currentConvoTag.Randomize();
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auto frame = std::make_shared< ProtocolFrame >();
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auto ex = std::make_shared< AsyncKeyExchange >(
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m_Endpoint->RouterLogic(), remoteIdent, m_Endpoint->GetIdentity(),
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currentIntroSet.K, remoteIntro, m_DataHandler, currentConvoTag, t);
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ex->hook =
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std::bind(&OutboundContext::Send, this, std::placeholders::_1, path);
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ex->msg.PutBuffer(payload);
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ex->msg.introReply = path->intro;
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frame->F = ex->msg.introReply.pathID;
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m_Endpoint->CryptoWorker()->addJob(
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std::bind(&AsyncKeyExchange::Encrypt, ex, frame));
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}
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std::string
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OutboundContext::Name() const
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{
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return "OBContext:" + m_Endpoint->Name() + "-"
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+ currentIntroSet.A.Addr().ToString();
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}
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void
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OutboundContext::UpdateIntroSet(bool randomizePath)
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{
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if(updatingIntroSet || markedBad)
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return;
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const auto addr = currentIntroSet.A.Addr();
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path::Path_ptr path = nullptr;
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if(randomizePath)
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{
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path = m_Endpoint->PickRandomEstablishedPath();
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}
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else
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path = m_Endpoint->GetEstablishedPathClosestTo(addr.as_array());
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if(path == nullptr)
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{
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path = PickRandomEstablishedPath();
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}
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if(path)
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{
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HiddenServiceAddressLookup* job = new HiddenServiceAddressLookup(
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m_Endpoint, util::memFn(&OutboundContext::OnIntroSetUpdate, this),
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addr, m_Endpoint->GenTXID());
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updatingIntroSet = job->SendRequestViaPath(path, m_Endpoint->Router());
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}
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else
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{
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LogWarn("Cannot update introset no path for outbound session to ",
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currentIntroSet.A.Addr().ToString());
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}
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}
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util::StatusObject
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OutboundContext::ExtractStatus() const
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{
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auto obj = path::Builder::ExtractStatus();
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obj["currentConvoTag"] = currentConvoTag.ToHex();
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obj["remoteIntro"] = remoteIntro.ExtractStatus();
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obj["sessionCreatedAt"] = createdAt;
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obj["lastGoodSend"] = lastGoodSend;
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obj["seqno"] = sequenceNo;
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obj["markedBad"] = markedBad;
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obj["lastShift"] = lastShift;
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obj["remoteIdentity"] = remoteIdent.Addr().ToString();
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obj["currentRemoteIntroset"] = currentIntroSet.ExtractStatus();
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obj["nextIntro"] = m_NextIntro.ExtractStatus();
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std::transform(m_BadIntros.begin(), m_BadIntros.end(),
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std::back_inserter(obj["badIntros"]),
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[](const auto& item) -> util::StatusObject {
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return util::StatusObject{
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{"count", item.second},
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{"intro", item.first.ExtractStatus()}};
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});
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return obj;
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}
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bool
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OutboundContext::Pump(llarp_time_t now)
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{
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// we are probably dead af
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if(m_LookupFails > 16 || m_BuildFails > 10)
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return true;
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// check for expiration
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if(remoteIntro.ExpiresSoon(now))
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{
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// shift intro if it expires "soon"
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if(ShiftIntroduction())
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SwapIntros(); // swap intros if we shifted
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}
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// lookup router in intro if set and unknown
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m_Endpoint->EnsureRouterIsKnown(remoteIntro.router);
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// expire bad intros
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auto itr = m_BadIntros.begin();
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while(itr != m_BadIntros.end())
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{
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if(now > itr->second && now - itr->second > path::default_lifetime)
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itr = m_BadIntros.erase(itr);
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else
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++itr;
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}
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if(currentIntroSet.HasExpiredIntros(now))
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{
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UpdateIntroSet(true);
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}
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// send control message if we look too quiet
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if(lastGoodSend)
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{
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if(now - lastGoodSend > (sendTimeout / 2))
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{
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if(!GetNewestPathByRouter(remoteIntro.router))
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{
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if(!BuildCooldownHit(now))
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BuildOneAlignedTo(remoteIntro.router);
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}
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else
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{
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Encrypted< 64 > tmp;
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tmp.Randomize();
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llarp_buffer_t buf(tmp.data(), tmp.size());
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AsyncEncryptAndSendTo(buf, eProtocolControl);
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}
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}
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}
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// if we are dead return true so we are removed
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return lastGoodSend
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? (now >= lastGoodSend && now - lastGoodSend > sendTimeout)
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: (now >= createdAt && now - createdAt > connectTimeout);
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}
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bool
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OutboundContext::SelectHop(llarp_nodedb* db,
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const std::set< RouterID >& prev,
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RouterContact& cur, size_t hop,
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path::PathRole roles)
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{
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if(m_NextIntro.router.IsZero() || prev.count(m_NextIntro.router))
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{
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ShiftIntroduction(false);
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}
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if(m_NextIntro.router.IsZero())
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return false;
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std::set< RouterID > exclude = prev;
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exclude.insert(m_NextIntro.router);
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for(const auto& snode : m_Endpoint->SnodeBlacklist())
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exclude.insert(snode);
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if(hop == 0)
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{
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// exclude any exits as our first hop
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const auto exits = m_Endpoint->GetExitRouters();
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exclude.insert(exits.begin(), exits.end());
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}
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if(hop == numHops - 1)
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{
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m_Endpoint->EnsureRouterIsKnown(m_NextIntro.router);
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if(db->Get(m_NextIntro.router, cur))
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return true;
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++m_BuildFails;
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return false;
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}
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return path::Builder::SelectHop(db, exclude, cur, hop, roles);
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}
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bool
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OutboundContext::ShouldBuildMore(llarp_time_t now) const
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{
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if(markedBad)
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return false;
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const bool should = path::Builder::BuildCooldownHit(now);
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if(!ReadyToSend())
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{
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return should;
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}
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llarp_time_t t = 0;
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ForEachPath([&t](path::Path_ptr path) {
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if(path->IsReady())
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t = std::max(path->ExpireTime(), t);
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});
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if(t <= now)
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return should;
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return should && t - now >= path::default_lifetime / 2;
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}
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bool
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OutboundContext::MarkCurrentIntroBad(llarp_time_t now)
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{
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return MarkIntroBad(remoteIntro, now);
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}
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bool
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OutboundContext::MarkIntroBad(const Introduction& intro, llarp_time_t now)
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{
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// insert bad intro
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m_BadIntros[intro] = now;
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// try shifting intro without rebuild
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if(ShiftIntroduction(false))
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{
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|
|
// we shifted
|
|
|
|
// check if we have a path to the next intro router
|
|
|
|
if(GetNewestPathByRouter(m_NextIntro.router))
|
|
|
|
return true;
|
|
|
|
// we don't have a path build one if we aren't building too fast
|
|
|
|
if(!BuildCooldownHit(now))
|
|
|
|
BuildOneAlignedTo(m_NextIntro.router);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
// we didn't shift check if we should update introset
|
|
|
|
if(now - lastShift >= MIN_SHIFT_INTERVAL
|
|
|
|
|| currentIntroSet.HasExpiredIntros(now)
|
|
|
|
|| currentIntroSet.IsExpired(now))
|
|
|
|
{
|
|
|
|
// update introset
|
|
|
|
LogInfo(Name(), " updating introset");
|
|
|
|
UpdateIntroSet(true);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool
|
|
|
|
OutboundContext::ShiftIntroduction(bool rebuild)
|
|
|
|
{
|
|
|
|
bool success = false;
|
|
|
|
auto now = Now();
|
|
|
|
if(now - lastShift < MIN_SHIFT_INTERVAL)
|
|
|
|
return false;
|
|
|
|
bool shifted = false;
|
|
|
|
std::vector< Introduction > intros = currentIntroSet.I;
|
|
|
|
if(intros.size() > 1)
|
|
|
|
{
|
|
|
|
std::random_device rd;
|
|
|
|
std::mt19937 g(rd());
|
|
|
|
std::shuffle(intros.begin(), intros.end(), g);
|
|
|
|
}
|
|
|
|
|
|
|
|
// to find a intro on the same router as before that is newer
|
|
|
|
for(const auto& intro : intros)
|
|
|
|
{
|
|
|
|
if(intro.ExpiresSoon(now))
|
|
|
|
continue;
|
|
|
|
if(m_Endpoint->SnodeBlacklist().count(intro.router))
|
|
|
|
continue;
|
|
|
|
if(m_BadIntros.find(intro) == m_BadIntros.end()
|
|
|
|
&& remoteIntro.router == intro.router)
|
|
|
|
{
|
|
|
|
if(intro.expiresAt > m_NextIntro.expiresAt)
|
|
|
|
{
|
|
|
|
success = true;
|
|
|
|
m_NextIntro = intro;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if(!success)
|
|
|
|
{
|
|
|
|
/// pick newer intro not on same router
|
|
|
|
for(const auto& intro : intros)
|
|
|
|
{
|
|
|
|
if(m_Endpoint->SnodeBlacklist().count(intro.router))
|
|
|
|
continue;
|
|
|
|
m_Endpoint->EnsureRouterIsKnown(intro.router);
|
|
|
|
if(intro.ExpiresSoon(now))
|
|
|
|
continue;
|
|
|
|
if(m_BadIntros.find(intro) == m_BadIntros.end()
|
|
|
|
&& m_NextIntro != intro)
|
|
|
|
{
|
|
|
|
if(intro.expiresAt > m_NextIntro.expiresAt)
|
|
|
|
{
|
|
|
|
shifted = intro.router != m_NextIntro.router;
|
|
|
|
m_NextIntro = intro;
|
|
|
|
success = true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if(m_NextIntro.router.IsZero())
|
|
|
|
return false;
|
|
|
|
if(shifted)
|
|
|
|
lastShift = now;
|
|
|
|
if(rebuild && !BuildCooldownHit(Now()))
|
|
|
|
BuildOneAlignedTo(m_NextIntro.router);
|
|
|
|
return success;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
OutboundContext::HandlePathDied(path::Path_ptr path)
|
|
|
|
{
|
|
|
|
// unconditionally update introset
|
|
|
|
UpdateIntroSet(true);
|
|
|
|
const RouterID endpoint(path->Endpoint());
|
|
|
|
// if a path to our current intro died...
|
|
|
|
if(endpoint == remoteIntro.router)
|
|
|
|
{
|
|
|
|
// figure out how many paths to this router we have
|
|
|
|
size_t num = 0;
|
|
|
|
ForEachPath([&](const path::Path_ptr& p) {
|
|
|
|
if(p->Endpoint() == endpoint && p->IsReady())
|
|
|
|
++num;
|
|
|
|
});
|
|
|
|
// if we have more than two then we are probably fine
|
|
|
|
if(num > 2)
|
|
|
|
return;
|
|
|
|
// if we have one working one ...
|
|
|
|
if(num == 1)
|
|
|
|
{
|
|
|
|
num = 0;
|
|
|
|
ForEachPath([&](const path::Path_ptr& p) {
|
|
|
|
if(p->Endpoint() == endpoint)
|
|
|
|
++num;
|
|
|
|
});
|
|
|
|
// if we have 2 or more established or pending don't do anything
|
|
|
|
if(num > 2)
|
|
|
|
return;
|
|
|
|
BuildOneAlignedTo(endpoint);
|
|
|
|
}
|
|
|
|
else if(num == 0)
|
|
|
|
{
|
|
|
|
// we have no paths to this router right now
|
|
|
|
// hop off it
|
|
|
|
Introduction picked;
|
|
|
|
// get the latest intro that isn't on that endpoint
|
|
|
|
for(const auto& intro : currentIntroSet.I)
|
|
|
|
{
|
|
|
|
if(intro.router == endpoint)
|
|
|
|
continue;
|
|
|
|
if(intro.expiresAt > picked.expiresAt)
|
|
|
|
picked = intro;
|
|
|
|
}
|
|
|
|
// we got nothing
|
|
|
|
if(picked.router.IsZero())
|
|
|
|
{
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
m_NextIntro = picked;
|
|
|
|
// check if we have a path to this router
|
|
|
|
num = 0;
|
|
|
|
ForEachPath([&](const path::Path_ptr& p) {
|
|
|
|
// don't count timed out paths
|
|
|
|
if(p->Status() != path::ePathTimeout
|
|
|
|
&& p->Endpoint() == m_NextIntro.router)
|
|
|
|
++num;
|
|
|
|
});
|
|
|
|
// build a path if one isn't already pending build or established
|
|
|
|
BuildOneAlignedTo(m_NextIntro.router);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
bool
|
|
|
|
OutboundContext::HandleHiddenServiceFrame(path::Path_ptr p,
|
|
|
|
const ProtocolFrame& frame)
|
|
|
|
{
|
|
|
|
return m_Endpoint->HandleHiddenServiceFrame(p, frame);
|
|
|
|
}
|
|
|
|
|
|
|
|
} // namespace service
|
|
|
|
|
|
|
|
} // namespace llarp
|