mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-10-29 11:05:43 +00:00
325 lines
9.0 KiB
C++
325 lines
9.0 KiB
C++
#include <path/path.hpp>
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#include <dht/context.hpp>
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#include <exit/context.hpp>
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#include <messages/discard.hpp>
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#include <messages/exit.hpp>
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#include <messages/path_latency.hpp>
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#include <messages/path_transfer.hpp>
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#include <messages/relay_commit.hpp>
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#include <router/abstractrouter.hpp>
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#include <routing/handler.hpp>
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#include <util/buffer.hpp>
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#include <util/endian.hpp>
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namespace llarp
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{
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namespace path
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{
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TransitHop::TransitHop()
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{
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}
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bool
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TransitHop::Expired(llarp_time_t now) const
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{
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return now >= ExpireTime();
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}
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llarp_time_t
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TransitHop::ExpireTime() const
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{
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return started + lifetime;
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}
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TransitHopInfo::TransitHopInfo(const TransitHopInfo& other)
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: txID(other.txID)
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, rxID(other.rxID)
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, upstream(other.upstream)
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, downstream(other.downstream)
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{
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}
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TransitHopInfo::TransitHopInfo(const RouterID& down,
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const LR_CommitRecord& record)
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: txID(record.txid)
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, rxID(record.rxid)
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, upstream(record.nextHop)
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, downstream(down)
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{
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}
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TransitHop::TransitHop(const TransitHop& other)
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: info(other.info)
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, pathKey(other.pathKey)
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, started(other.started)
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, lifetime(other.lifetime)
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, version(other.version)
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{
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}
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bool
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TransitHop::SendRoutingMessage(const routing::IMessage& msg,
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AbstractRouter* r)
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{
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if(!IsEndpoint(r->pubkey()))
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return false;
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std::array< byte_t, MAX_LINK_MSG_SIZE - 128 > tmp;
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llarp_buffer_t buf(tmp);
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if(!msg.BEncode(&buf))
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{
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llarp::LogError("failed to encode routing message");
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return false;
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}
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TunnelNonce N;
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N.Randomize();
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buf.sz = buf.cur - buf.base;
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// pad to nearest MESSAGE_PAD_SIZE bytes
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auto dlt = buf.sz % pad_size;
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if(dlt)
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{
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dlt = pad_size - dlt;
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// randomize padding
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r->crypto()->randbytes(buf.cur, dlt);
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buf.sz += dlt;
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}
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buf.cur = buf.base;
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return HandleDownstream(buf, N, r);
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}
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bool
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TransitHop::HandleDownstream(const llarp_buffer_t& buf,
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const TunnelNonce& Y, AbstractRouter* r)
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{
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RelayDownstreamMessage msg;
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msg.pathid = info.rxID;
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msg.Y = Y ^ nonceXOR;
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r->crypto()->xchacha20(buf, pathKey, Y);
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msg.X = buf;
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llarp::LogDebug("relay ", msg.X.size(), " bytes downstream from ",
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info.upstream, " to ", info.downstream);
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return r->SendToOrQueue(info.downstream, &msg);
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}
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bool
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TransitHop::HandleUpstream(const llarp_buffer_t& buf, const TunnelNonce& Y,
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AbstractRouter* r)
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{
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r->crypto()->xchacha20(buf, pathKey, Y);
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if(IsEndpoint(r->pubkey()))
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{
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m_LastActivity = r->Now();
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return r->ParseRoutingMessageBuffer(buf, this, info.rxID);
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}
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else
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{
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RelayUpstreamMessage msg;
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msg.pathid = info.txID;
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msg.Y = Y ^ nonceXOR;
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msg.X = buf;
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llarp::LogDebug("relay ", msg.X.size(), " bytes upstream from ",
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info.downstream, " to ", info.upstream);
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return r->SendToOrQueue(info.upstream, &msg);
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}
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}
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bool
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TransitHop::HandleDHTMessage(const llarp::dht::IMessage& msg,
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AbstractRouter* r)
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{
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return r->dht()->impl->RelayRequestForPath(info.rxID, msg);
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}
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bool
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TransitHop::HandlePathLatencyMessage(
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const llarp::routing::PathLatencyMessage& msg, AbstractRouter* r)
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{
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llarp::routing::PathLatencyMessage reply;
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reply.L = msg.T;
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return SendRoutingMessage(reply, r);
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}
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bool
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TransitHop::HandlePathConfirmMessage(
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__attribute__((unused)) const llarp::routing::PathConfirmMessage& msg,
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__attribute__((unused)) AbstractRouter* r)
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{
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llarp::LogWarn("unwarranted path confirm message on ", info);
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return false;
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}
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bool
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TransitHop::HandleDataDiscardMessage(
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__attribute__((unused)) const llarp::routing::DataDiscardMessage& msg,
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__attribute__((unused)) AbstractRouter* r)
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{
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llarp::LogWarn("unwarranted path data discard message on ", info);
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return false;
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}
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bool
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TransitHop::HandleObtainExitMessage(
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const llarp::routing::ObtainExitMessage& msg, AbstractRouter* r)
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{
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if(msg.Verify(r->crypto())
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&& r->exitContext().ObtainNewExit(msg.I, info.rxID, msg.E != 0))
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{
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llarp::routing::GrantExitMessage grant;
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grant.S = NextSeqNo();
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grant.T = msg.T;
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if(!grant.Sign(r->crypto(), r->identity()))
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{
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llarp::LogError("Failed to sign grant exit message");
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return false;
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}
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return SendRoutingMessage(grant, r);
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}
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// TODO: exponential backoff
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// TODO: rejected policies
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llarp::routing::RejectExitMessage reject;
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reject.S = NextSeqNo();
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reject.T = msg.T;
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if(!reject.Sign(r->crypto(), r->identity()))
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{
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llarp::LogError("Failed to sign reject exit message");
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return false;
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}
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return SendRoutingMessage(reject, r);
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}
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bool
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TransitHop::HandleCloseExitMessage(
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const llarp::routing::CloseExitMessage& msg, AbstractRouter* r)
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{
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const llarp::routing::DataDiscardMessage discard(info.rxID, msg.S);
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auto ep = r->exitContext().FindEndpointForPath(info.rxID);
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if(ep && msg.Verify(r->crypto(), ep->PubKey()))
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{
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llarp::routing::CloseExitMessage reply;
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reply.Y = msg.Y;
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reply.S = NextSeqNo();
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if(reply.Sign(r->crypto(), r->identity()))
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{
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if(SendRoutingMessage(reply, r))
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{
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r->PumpLL();
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ep->Close();
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return true;
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}
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}
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}
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return SendRoutingMessage(discard, r);
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}
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bool
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TransitHop::HandleUpdateExitVerifyMessage(
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const llarp::routing::UpdateExitVerifyMessage& msg, AbstractRouter* r)
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{
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(void)msg;
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(void)r;
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llarp::LogError("unwarranted exit verify on ", info);
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return false;
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}
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bool
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TransitHop::HandleUpdateExitMessage(
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const llarp::routing::UpdateExitMessage& msg, AbstractRouter* r)
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{
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auto ep = r->exitContext().FindEndpointForPath(msg.P);
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if(ep)
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{
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if(!msg.Verify(r->crypto(), ep->PubKey()))
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return false;
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if(ep->UpdateLocalPath(info.rxID))
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{
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llarp::routing::UpdateExitVerifyMessage reply;
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reply.T = msg.T;
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reply.S = NextSeqNo();
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return SendRoutingMessage(reply, r);
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}
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}
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// on fail tell message was discarded
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llarp::routing::DataDiscardMessage discard(info.rxID, msg.S);
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return SendRoutingMessage(discard, r);
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}
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bool
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TransitHop::HandleRejectExitMessage(
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const llarp::routing::RejectExitMessage& msg, AbstractRouter* r)
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{
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(void)msg;
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(void)r;
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llarp::LogError(info, " got unwarranted RXM");
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return false;
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}
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bool
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TransitHop::HandleGrantExitMessage(
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const llarp::routing::GrantExitMessage& msg, AbstractRouter* r)
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{
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(void)msg;
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(void)r;
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llarp::LogError(info, " got unwarranted GXM");
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return false;
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}
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bool
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TransitHop::HandleTransferTrafficMessage(
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const llarp::routing::TransferTrafficMessage& msg, AbstractRouter* r)
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{
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auto endpoint = r->exitContext().FindEndpointForPath(info.rxID);
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if(endpoint)
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{
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bool sent = true;
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for(const auto& pkt : msg.X)
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{
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// check short packet buffer
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if(pkt.size() <= 8)
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continue;
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uint64_t counter = bufbe64toh(pkt.data());
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sent &= endpoint->QueueOutboundTraffic(
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ManagedBuffer(llarp_buffer_t(pkt.data() + 8, pkt.size() - 8)),
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counter);
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}
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return sent;
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}
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else
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llarp::LogError("No exit endpoint on ", info);
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// discarded
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llarp::routing::DataDiscardMessage discard(info.rxID, msg.S);
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return SendRoutingMessage(discard, r);
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}
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bool
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TransitHop::HandlePathTransferMessage(
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const llarp::routing::PathTransferMessage& msg, AbstractRouter* r)
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{
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auto path = r->pathContext().GetPathForTransfer(msg.P);
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llarp::routing::DataDiscardMessage discarded(msg.P, msg.S);
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if(path == nullptr || msg.T.F != info.txID)
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{
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return SendRoutingMessage(discarded, r);
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}
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std::array< byte_t, service::MAX_PROTOCOL_MESSAGE_SIZE > tmp;
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llarp_buffer_t buf(tmp);
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if(!msg.T.BEncode(&buf))
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{
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llarp::LogWarn(info, " failed to transfer data message, encode failed");
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return SendRoutingMessage(discarded, r);
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}
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// rewind
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buf.sz = buf.cur - buf.base;
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buf.cur = buf.base;
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// send
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if(path->HandleDownstream(buf, msg.Y, r))
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return true;
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return SendRoutingMessage(discarded, r);
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}
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} // namespace path
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} // namespace llarp
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