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234 lines
6.8 KiB
C++
234 lines
6.8 KiB
C++
#include <exit/session.hpp>
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#include <path/path.hpp>
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#include <router/router.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(const llarp::RouterID& router,
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std::function< bool(llarp_buffer_t) > writepkt,
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llarp::Router* r, size_t numpaths, size_t hoplen)
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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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{
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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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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);
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if(NumPathsExistingAt(future) < expect)
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return llarp::randint() % 4
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== 0; // 25% chance for build if we will run out soon
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// if we don't have the expended number of paths right now try building
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// some if the cooldown timer isn't hit
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if(AvailablePaths(llarp::path::ePathRoleExit) < expect)
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return !path::Builder::BuildCooldownHit(now);
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// maintain regular number of paths
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return path::Builder::ShouldBuildMore(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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return db->Get(m_ExitRouter, cur);
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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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void
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BaseSession::HandlePathBuilt(llarp::path::Path* 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->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("faild to send exit request");
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}
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bool
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BaseSession::HandleGotExit(llarp::path::Path* 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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llarp::LogInfo("obtained an exit via ", p->Endpoint());
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return true;
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}
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bool
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BaseSession::Stop()
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{
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auto sendExitClose = [&](llarp::path::Path* 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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return llarp::path::Builder::Stop();
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}
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bool
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BaseSession::HandleTraffic(llarp::path::Path* p, llarp_buffer_t buf,
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uint64_t counter)
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{
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(void)p;
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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* p, const PathID_t& path,
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uint64_t s)
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{
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(void)p;
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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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auto 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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return AvailablePaths(llarp::path::ePathRoleExit) > 0;
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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::Flush()
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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;
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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->SendRoutingMessage(&msg, router))
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m_LastUse = now;
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queue.pop_front();
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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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}
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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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return true;
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}
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SNodeSession::SNodeSession(const llarp::RouterID& snodeRouter,
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std::function< bool(llarp_buffer_t) > writepkt,
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llarp::Router* r, size_t numpaths, size_t hoplen,
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bool useRouterSNodeKey)
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: BaseSession(snodeRouter, writepkt, r, numpaths, hoplen)
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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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} // namespace exit
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} // namespace llarp
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