mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-11-09 13:10:25 +00:00
319 lines
8.9 KiB
C++
319 lines
8.9 KiB
C++
#include <path/path.hpp>
|
|
|
|
#include <dht/context.hpp>
|
|
#include <exit/context.hpp>
|
|
#include <messages/discard.hpp>
|
|
#include <messages/exit.hpp>
|
|
#include <messages/path_latency.hpp>
|
|
#include <messages/path_transfer.hpp>
|
|
#include <messages/relay_commit.hpp>
|
|
#include <router/abstractrouter.hpp>
|
|
#include <routing/handler.hpp>
|
|
#include <util/buffer.hpp>
|
|
#include <util/endian.hpp>
|
|
|
|
namespace llarp
|
|
{
|
|
namespace path
|
|
{
|
|
TransitHop::TransitHop()
|
|
{
|
|
}
|
|
|
|
bool
|
|
TransitHop::Expired(llarp_time_t now) const
|
|
{
|
|
return now >= ExpireTime();
|
|
}
|
|
|
|
llarp_time_t
|
|
TransitHop::ExpireTime() const
|
|
{
|
|
return started + lifetime;
|
|
}
|
|
|
|
TransitHopInfo::TransitHopInfo(const TransitHopInfo& other)
|
|
: txID(other.txID)
|
|
, rxID(other.rxID)
|
|
, upstream(other.upstream)
|
|
, downstream(other.downstream)
|
|
{
|
|
}
|
|
|
|
TransitHopInfo::TransitHopInfo(const RouterID& down,
|
|
const LR_CommitRecord& record)
|
|
: txID(record.txid)
|
|
, rxID(record.rxid)
|
|
, upstream(record.nextHop)
|
|
, downstream(down)
|
|
{
|
|
}
|
|
|
|
TransitHop::TransitHop(const TransitHop& other)
|
|
: info(other.info)
|
|
, pathKey(other.pathKey)
|
|
, started(other.started)
|
|
, lifetime(other.lifetime)
|
|
, version(other.version)
|
|
{
|
|
}
|
|
|
|
bool
|
|
TransitHop::SendRoutingMessage(const routing::IMessage& msg,
|
|
AbstractRouter* r)
|
|
{
|
|
if(!IsEndpoint(r->pubkey()))
|
|
return false;
|
|
|
|
std::array< byte_t, MAX_LINK_MSG_SIZE - 128 > tmp;
|
|
llarp_buffer_t buf(tmp);
|
|
if(!msg.BEncode(&buf))
|
|
{
|
|
llarp::LogError("failed to encode routing message");
|
|
return false;
|
|
}
|
|
TunnelNonce N;
|
|
N.Randomize();
|
|
buf.sz = buf.cur - buf.base;
|
|
// pad to nearest MESSAGE_PAD_SIZE bytes
|
|
auto dlt = buf.sz % pad_size;
|
|
if(dlt)
|
|
{
|
|
dlt = pad_size - dlt;
|
|
// randomize padding
|
|
r->crypto()->randbytes(buf.cur, dlt);
|
|
buf.sz += dlt;
|
|
}
|
|
buf.cur = buf.base;
|
|
return HandleDownstream(buf, N, r);
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandleDownstream(const llarp_buffer_t& buf,
|
|
const TunnelNonce& Y, AbstractRouter* r)
|
|
{
|
|
RelayDownstreamMessage msg;
|
|
msg.pathid = info.rxID;
|
|
msg.Y = Y ^ nonceXOR;
|
|
r->crypto()->xchacha20(buf, pathKey, Y);
|
|
msg.X = buf;
|
|
llarp::LogDebug("relay ", msg.X.size(), " bytes downstream from ",
|
|
info.upstream, " to ", info.downstream);
|
|
return r->SendToOrQueue(info.downstream, &msg);
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandleUpstream(const llarp_buffer_t& buf, const TunnelNonce& Y,
|
|
AbstractRouter* r)
|
|
{
|
|
r->crypto()->xchacha20(buf, pathKey, Y);
|
|
if(IsEndpoint(r->pubkey()))
|
|
{
|
|
m_LastActivity = r->Now();
|
|
return r->ParseRoutingMessageBuffer(buf, this, info.rxID);
|
|
}
|
|
else
|
|
{
|
|
RelayUpstreamMessage msg;
|
|
msg.pathid = info.txID;
|
|
msg.Y = Y ^ nonceXOR;
|
|
|
|
msg.X = buf;
|
|
llarp::LogDebug("relay ", msg.X.size(), " bytes upstream from ",
|
|
info.downstream, " to ", info.upstream);
|
|
return r->SendToOrQueue(info.upstream, &msg);
|
|
}
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandleDHTMessage(const llarp::dht::IMessage& msg,
|
|
AbstractRouter* r)
|
|
{
|
|
return r->dht()->impl->RelayRequestForPath(info.rxID, msg);
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandlePathLatencyMessage(
|
|
const llarp::routing::PathLatencyMessage& msg, AbstractRouter* r)
|
|
{
|
|
llarp::routing::PathLatencyMessage reply;
|
|
reply.L = msg.T;
|
|
return SendRoutingMessage(reply, r);
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandlePathConfirmMessage(
|
|
__attribute__((unused)) const llarp::routing::PathConfirmMessage& msg,
|
|
__attribute__((unused)) AbstractRouter* r)
|
|
{
|
|
llarp::LogWarn("unwarranted path confirm message on ", info);
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandleDataDiscardMessage(
|
|
__attribute__((unused)) const llarp::routing::DataDiscardMessage& msg,
|
|
__attribute__((unused)) AbstractRouter* r)
|
|
{
|
|
llarp::LogWarn("unwarranted path data discard message on ", info);
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandleObtainExitMessage(
|
|
const llarp::routing::ObtainExitMessage& msg, AbstractRouter* r)
|
|
{
|
|
if(msg.Verify(r->crypto())
|
|
&& r->exitContext().ObtainNewExit(msg.I, info.rxID, msg.E != 0))
|
|
{
|
|
llarp::routing::GrantExitMessage grant;
|
|
grant.S = NextSeqNo();
|
|
grant.T = msg.T;
|
|
if(!grant.Sign(r->crypto(), r->identity()))
|
|
{
|
|
llarp::LogError("Failed to sign grant exit message");
|
|
return false;
|
|
}
|
|
return SendRoutingMessage(grant, r);
|
|
}
|
|
// TODO: exponential backoff
|
|
// TODO: rejected policies
|
|
llarp::routing::RejectExitMessage reject;
|
|
reject.S = NextSeqNo();
|
|
reject.T = msg.T;
|
|
if(!reject.Sign(r->crypto(), r->identity()))
|
|
{
|
|
llarp::LogError("Failed to sign reject exit message");
|
|
return false;
|
|
}
|
|
return SendRoutingMessage(reject, r);
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandleCloseExitMessage(
|
|
const llarp::routing::CloseExitMessage& msg, AbstractRouter* r)
|
|
{
|
|
llarp::routing::DataDiscardMessage discard(info.rxID, msg.S);
|
|
auto ep = r->exitContext().FindEndpointForPath(info.rxID);
|
|
if(ep && msg.Verify(r->crypto(), ep->PubKey()))
|
|
{
|
|
ep->Close();
|
|
// ep is now gone af
|
|
llarp::routing::CloseExitMessage reply;
|
|
reply.S = NextSeqNo();
|
|
if(reply.Sign(r->crypto(), r->identity()))
|
|
return SendRoutingMessage(reply, r);
|
|
}
|
|
return SendRoutingMessage(discard, r);
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandleUpdateExitVerifyMessage(
|
|
const llarp::routing::UpdateExitVerifyMessage& msg, AbstractRouter* r)
|
|
{
|
|
(void)msg;
|
|
(void)r;
|
|
llarp::LogError("unwarranted exit verify on ", info);
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandleUpdateExitMessage(
|
|
const llarp::routing::UpdateExitMessage& msg, AbstractRouter* r)
|
|
{
|
|
auto ep = r->exitContext().FindEndpointForPath(msg.P);
|
|
if(ep)
|
|
{
|
|
if(!msg.Verify(r->crypto(), ep->PubKey()))
|
|
return false;
|
|
|
|
if(ep->UpdateLocalPath(info.rxID))
|
|
{
|
|
llarp::routing::UpdateExitVerifyMessage reply;
|
|
reply.T = msg.T;
|
|
reply.S = NextSeqNo();
|
|
return SendRoutingMessage(reply, r);
|
|
}
|
|
}
|
|
// on fail tell message was discarded
|
|
llarp::routing::DataDiscardMessage discard(info.rxID, msg.S);
|
|
return SendRoutingMessage(discard, r);
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandleRejectExitMessage(
|
|
const llarp::routing::RejectExitMessage& msg, AbstractRouter* r)
|
|
{
|
|
(void)msg;
|
|
(void)r;
|
|
llarp::LogError(info, " got unwarranted RXM");
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandleGrantExitMessage(
|
|
const llarp::routing::GrantExitMessage& msg, AbstractRouter* r)
|
|
{
|
|
(void)msg;
|
|
(void)r;
|
|
llarp::LogError(info, " got unwarranted GXM");
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandleTransferTrafficMessage(
|
|
const llarp::routing::TransferTrafficMessage& msg, AbstractRouter* r)
|
|
{
|
|
auto endpoint = r->exitContext().FindEndpointForPath(info.rxID);
|
|
if(endpoint)
|
|
{
|
|
bool sent = true;
|
|
for(const auto& pkt : msg.X)
|
|
{
|
|
// check short packet buffer
|
|
if(pkt.size() <= 8)
|
|
continue;
|
|
uint64_t counter = bufbe64toh(pkt.data());
|
|
sent &= endpoint->QueueOutboundTraffic(
|
|
ManagedBuffer(llarp_buffer_t(pkt.data() + 8, pkt.size() - 8)),
|
|
counter);
|
|
}
|
|
return sent;
|
|
}
|
|
else
|
|
llarp::LogError("No exit endpoint on ", info);
|
|
// discarded
|
|
llarp::routing::DataDiscardMessage discard(info.rxID, msg.S);
|
|
return SendRoutingMessage(discard, r);
|
|
}
|
|
|
|
bool
|
|
TransitHop::HandlePathTransferMessage(
|
|
const llarp::routing::PathTransferMessage& msg, AbstractRouter* r)
|
|
{
|
|
auto path = r->pathContext().GetPathForTransfer(msg.P);
|
|
llarp::routing::DataDiscardMessage discarded(msg.P, msg.S);
|
|
if(path == nullptr || msg.T.F != info.txID)
|
|
{
|
|
return SendRoutingMessage(discarded, r);
|
|
}
|
|
|
|
std::array< byte_t, service::MAX_PROTOCOL_MESSAGE_SIZE > tmp;
|
|
llarp_buffer_t buf(tmp);
|
|
if(!msg.T.BEncode(&buf))
|
|
{
|
|
llarp::LogWarn(info, " failed to transfer data message, encode failed");
|
|
return SendRoutingMessage(discarded, r);
|
|
}
|
|
// rewind
|
|
buf.sz = buf.cur - buf.base;
|
|
buf.cur = buf.base;
|
|
// send
|
|
if(path->HandleDownstream(buf, msg.Y, r))
|
|
return true;
|
|
return SendRoutingMessage(discarded, r);
|
|
}
|
|
|
|
} // namespace path
|
|
} // namespace llarp
|