mirror of
https://github.com/oxen-io/lokinet
synced 2023-12-14 06:53:00 +01:00
308 lines
8.6 KiB
C++
308 lines
8.6 KiB
C++
#include <llarp/path.hpp>
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#include <llarp/routing/handler.hpp>
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#include <llarp/messages/discard.hpp>
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#include "buffer.hpp"
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#include "router.hpp"
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#include <llarp/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 llarp::routing::IMessage* msg,
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llarp::Router* r)
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{
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if(!IsEndpoint(r->pubkey()))
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return false;
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byte_t tmp[MAX_LINK_MSG_SIZE - 128];
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auto buf = llarp::StackBuffer< decltype(tmp) >(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 % MESSAGE_PAD_SIZE;
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if(dlt)
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{
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dlt = MESSAGE_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(llarp_buffer_t buf, const TunnelNonce& Y,
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llarp::Router* 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(llarp_buffer_t buf, const TunnelNonce& Y,
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llarp::Router* 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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return m_MessageParser.ParseMessageBuffer(buf, this, info.rxID, r);
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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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llarp::Router* 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, llarp::Router* 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)) llarp::Router* 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)) llarp::Router* 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, llarp::Router* 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, llarp::Router* r)
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{
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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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ep->Close();
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// ep is now gone af
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llarp::routing::CloseExitMessage reply;
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reply.S = NextSeqNo();
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if(reply.Sign(&r->crypto, r->identity))
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return SendRoutingMessage(&reply, r);
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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, llarp::Router* 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, llarp::Router* 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, llarp::Router* 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 unwarrented 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, llarp::Router* 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 unwarrented 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, llarp::Router* 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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llarp::InitBuffer(pkt.data() + 8, pkt.size() - 8), 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, llarp::Router* r)
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{
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auto path = r->paths.GetPathForTransfer(msg->P);
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llarp::routing::DataDiscardMessage discarded(msg->P, msg->S);
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if(!path)
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{
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return SendRoutingMessage(&discarded, r);
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}
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byte_t tmp[service::MAX_PROTOCOL_MESSAGE_SIZE];
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auto buf = llarp::StackBuffer< decltype(tmp) >(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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// rewind0
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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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