mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-10-29 11:05:43 +00:00
321 lines
8.9 KiB
C++
321 lines
8.9 KiB
C++
#include <exit/session.hpp>
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#include <nodedb.hpp>
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#include <path/path.hpp>
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#include <router/abstractrouter.hpp>
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namespace llarp
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{
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namespace exit
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{
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BaseSession::BaseSession(
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const llarp::RouterID& router,
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std::function< bool(const llarp_buffer_t&) > writepkt,
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AbstractRouter* r, size_t numpaths, size_t hoplen, bool bundleRC)
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: llarp::path::Builder(r, r->dht(), numpaths, hoplen)
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, m_ExitRouter(router)
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, m_WritePacket(writepkt)
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, m_Counter(0)
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, m_LastUse(0)
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, m_BundleRC(bundleRC)
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{
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r->crypto()->identity_keygen(m_ExitIdentity);
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}
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BaseSession::~BaseSession()
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{
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}
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void
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BaseSession::HandlePathDied(path::Path_ptr p)
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{
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p->Rebuild();
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}
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util::StatusObject
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BaseSession::ExtractStatus() const
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{
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auto obj = path::Builder::ExtractStatus();
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obj.Put("lastExitUse", m_LastUse);
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auto pub = m_ExitIdentity.toPublic();
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obj.Put("exitIdentity", pub.ToString());
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return obj;
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}
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bool
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BaseSession::LoadIdentityFromFile(const char* fname)
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{
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return m_ExitIdentity.LoadFromFile(fname);
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}
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bool
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BaseSession::ShouldBuildMore(llarp_time_t now) const
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{
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const size_t expect = (1 + (m_NumPaths / 2));
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// check 30 seconds into the future and see if we need more paths
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const llarp_time_t future = now + (30 * 1000) + buildIntervalLimit;
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return NumPathsExistingAt(future) < expect && !BuildCooldownHit(now);
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}
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bool
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BaseSession::SelectHop(llarp_nodedb* db, const RouterContact& prev,
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RouterContact& cur, size_t hop,
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llarp::path::PathRole roles)
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{
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if(hop == numHops - 1)
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{
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if(db->Get(m_ExitRouter, cur))
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return true;
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router->LookupRouter(m_ExitRouter, nullptr);
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return false;
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}
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else if(hop == numHops - 2)
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{
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return db->select_random_hop_excluding(cur,
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{prev.pubkey, m_ExitRouter});
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}
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else
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return path::Builder::SelectHop(db, prev, cur, hop, roles);
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}
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bool
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BaseSession::CheckPathDead(path::Path_ptr, llarp_time_t dlt)
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{
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return dlt >= 10000;
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}
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void
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BaseSession::HandlePathBuilt(llarp::path::Path_ptr p)
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{
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path::Builder::HandlePathBuilt(p);
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p->SetDropHandler(std::bind(&BaseSession::HandleTrafficDrop, this,
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std::placeholders::_1, std::placeholders::_2,
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std::placeholders::_3));
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p->SetDeadChecker(std::bind(&BaseSession::CheckPathDead, this,
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std::placeholders::_1,
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std::placeholders::_2));
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p->SetExitTrafficHandler(
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std::bind(&BaseSession::HandleTraffic, this, std::placeholders::_1,
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std::placeholders::_2, std::placeholders::_3));
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p->AddObtainExitHandler(std::bind(&BaseSession::HandleGotExit, this,
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std::placeholders::_1,
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std::placeholders::_2));
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llarp::routing::ObtainExitMessage obtain;
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obtain.S = p->NextSeqNo();
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obtain.T = llarp::randint();
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PopulateRequest(obtain);
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if(!obtain.Sign(router->crypto(), m_ExitIdentity))
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{
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llarp::LogError("Failed to sign exit request");
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return;
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}
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if(p->SendExitRequest(obtain, router))
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llarp::LogInfo("asking ", m_ExitRouter, " for exit");
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else
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llarp::LogError("failed to send exit request");
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}
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void
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BaseSession::AddReadyHook(SessionReadyFunc func)
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{
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m_PendingCallbacks.emplace_back(func);
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}
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bool
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BaseSession::HandleGotExit(llarp::path::Path_ptr p, llarp_time_t b)
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{
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m_LastUse = router->Now();
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if(b == 0)
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{
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llarp::LogInfo("obtained an exit via ", p->Endpoint());
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CallPendingCallbacks(true);
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}
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return true;
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}
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void
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BaseSession::CallPendingCallbacks(bool success)
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{
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if(success)
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{
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auto self = shared_from_this();
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for(auto& f : m_PendingCallbacks)
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f(self);
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}
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else
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{
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for(auto& f : m_PendingCallbacks)
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f(nullptr);
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}
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m_PendingCallbacks.clear();
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}
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bool
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BaseSession::Stop()
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{
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CallPendingCallbacks(false);
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auto sendExitClose = [&](const llarp::path::Path_ptr p) {
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if(p->SupportsAnyRoles(llarp::path::ePathRoleExit))
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{
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llarp::LogInfo(p->Name(), " closing exit path");
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llarp::routing::CloseExitMessage msg;
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if(!(msg.Sign(router->crypto(), m_ExitIdentity)
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&& p->SendExitClose(msg, router)))
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llarp::LogWarn(p->Name(), " failed to send exit close message");
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}
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};
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ForEachPath(sendExitClose);
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router->pathContext().RemovePathSet(shared_from_this());
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return llarp::path::Builder::Stop();
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}
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bool
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BaseSession::HandleTraffic(llarp::path::Path_ptr, const llarp_buffer_t& buf,
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uint64_t counter)
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{
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if(m_WritePacket)
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{
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llarp::net::IPv4Packet pkt;
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if(!pkt.Load(buf))
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return false;
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m_Downstream.emplace(counter, pkt);
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m_LastUse = router->Now();
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return true;
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}
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return false;
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}
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bool
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BaseSession::HandleTrafficDrop(llarp::path::Path_ptr, const PathID_t& path,
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uint64_t s)
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{
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llarp::LogError("dropped traffic on exit ", m_ExitRouter, " S=", s,
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" P=", path);
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return true;
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}
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bool
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BaseSession::QueueUpstreamTraffic(llarp::net::IPv4Packet pkt,
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const size_t N)
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{
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const llarp_buffer_t& buf = pkt.Buffer();
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auto& queue = m_Upstream[buf.sz / N];
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// queue overflow
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if(queue.size() >= MaxUpstreamQueueLength)
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return false;
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if(queue.size() == 0)
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{
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queue.emplace_back();
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return queue.back().PutBuffer(buf, m_Counter++);
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}
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auto& back = queue.back();
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// pack to nearest N
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if(back.Size() + buf.sz > N)
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{
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queue.emplace_back();
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return queue.back().PutBuffer(buf, m_Counter++);
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}
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else
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return back.PutBuffer(buf, m_Counter++);
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}
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bool
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BaseSession::IsReady() const
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{
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const size_t expect = (1 + (m_NumPaths / 2));
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return AvailablePaths(llarp::path::ePathRoleExit) >= expect;
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}
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bool
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BaseSession::IsExpired(llarp_time_t now) const
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{
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return m_LastUse && now > m_LastUse && now - m_LastUse > LifeSpan;
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}
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bool
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BaseSession::FlushUpstream()
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{
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auto now = router->Now();
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auto path = PickRandomEstablishedPath(llarp::path::ePathRoleExit);
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if(path)
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{
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for(auto& item : m_Upstream)
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{
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auto& queue = item.second; // XXX: uninitialised memory here!
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while(queue.size())
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{
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auto& msg = queue.front();
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msg.S = path->NextSeqNo();
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if(path && path->SendRoutingMessage(msg, router))
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m_LastUse = now;
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queue.pop_front();
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// spread across all paths
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path = PickRandomEstablishedPath(llarp::path::ePathRoleExit);
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}
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}
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}
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else
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{
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if(m_Upstream.size())
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llarp::LogWarn("no path for exit session");
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// discard upstream
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for(auto& item : m_Upstream)
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item.second.clear();
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m_Upstream.clear();
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if(numHops == 1)
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{
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auto r = router;
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RouterContact rc;
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if(r->nodedb()->Get(m_ExitRouter, rc))
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r->TryConnectAsync(rc, 5);
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else
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r->LookupRouter(m_ExitRouter,
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[r](const std::vector< RouterContact >& results) {
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if(results.size())
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r->TryConnectAsync(results[0], 5);
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});
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}
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}
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return true;
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}
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void
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BaseSession::FlushDownstream()
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{
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while(m_Downstream.size())
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{
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if(m_WritePacket)
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m_WritePacket(m_Downstream.top().second.ConstBuffer());
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m_Downstream.pop();
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}
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}
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SNodeSession::SNodeSession(
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const llarp::RouterID& snodeRouter,
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std::function< bool(const llarp_buffer_t&) > writepkt,
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AbstractRouter* r, size_t numpaths, size_t hoplen,
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bool useRouterSNodeKey, bool bundleRC)
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: BaseSession(snodeRouter, writepkt, r, numpaths, hoplen, bundleRC)
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{
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if(useRouterSNodeKey)
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{
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m_ExitIdentity = r->identity();
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}
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}
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std::string
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SNodeSession::Name() const
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{
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return "SNode::" + m_ExitRouter.ToString();
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}
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std::string
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ExitSession::Name() const
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{
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return "Exit::" + m_ExitRouter.ToString();
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}
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} // namespace exit
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} // namespace llarp
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