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665 lines
17 KiB
C++
665 lines
17 KiB
C++
#ifndef LLARP_PATH_HPP
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#define LLARP_PATH_HPP
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#include <aligned.hpp>
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#include <crypto.hpp>
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#include <dht.hpp>
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#include <messages/relay.hpp>
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#include <messages/relay_commit.hpp>
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#include <path_types.hpp>
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#include <pathbuilder.hpp>
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#include <pathset.hpp>
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#include <router_id.hpp>
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#include <routing/handler.hpp>
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#include <routing/message.hpp>
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#include <service/Intro.hpp>
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#include <threading.hpp>
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#include <time.hpp>
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#include <functional>
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#include <list>
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#include <map>
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#include <unordered_map>
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#include <vector>
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#define MAXHOPS (8)
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#define DEFAULT_PATH_LIFETIME (10 * 60 * 1000)
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#define PATH_BUILD_TIMEOUT (30 * 1000)
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#define MESSAGE_PAD_SIZE (128)
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#define PATH_ALIVE_TIMEOUT (10 * 1000)
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namespace llarp
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{
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namespace path
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{
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struct TransitHopInfo
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{
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TransitHopInfo() = default;
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TransitHopInfo(const TransitHopInfo& other);
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TransitHopInfo(const RouterID& down, const LR_CommitRecord& record);
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PathID_t txID, rxID;
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RouterID upstream;
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RouterID downstream;
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friend std::ostream&
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operator<<(std::ostream& out, const TransitHopInfo& info)
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{
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out << "<tx=" << info.txID << " rx=" << info.rxID;
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out << " upstream=" << info.upstream
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<< " downstream=" << info.downstream;
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return out << ">";
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}
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bool
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operator==(const TransitHopInfo& other) const
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{
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return txID == other.txID && rxID == other.rxID
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&& upstream == other.upstream && downstream == other.downstream;
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}
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bool
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operator!=(const TransitHopInfo& other) const
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{
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return !(*this == other);
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}
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bool
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operator<(const TransitHopInfo& other) const
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{
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return txID < other.txID || rxID < other.rxID
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|| upstream < other.upstream || downstream < other.downstream;
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}
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struct Hash
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{
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std::size_t
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operator()(TransitHopInfo const& a) const
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{
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std::size_t idx0, idx1, idx2, idx3;
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memcpy(&idx0, a.upstream, sizeof(std::size_t));
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memcpy(&idx1, a.downstream, sizeof(std::size_t));
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memcpy(&idx2, a.txID, sizeof(std::size_t));
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memcpy(&idx3, a.rxID, sizeof(std::size_t));
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return idx0 ^ idx1 ^ idx2;
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}
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};
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};
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struct PathIDHash
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{
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std::size_t
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operator()(const PathID_t& a) const
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{
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std::size_t idx0;
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memcpy(&idx0, a, sizeof(std::size_t));
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return idx0;
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}
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};
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struct IHopHandler
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{
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virtual ~IHopHandler(){};
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virtual bool
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Expired(llarp_time_t now) const = 0;
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virtual bool
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ExpiresSoon(llarp_time_t now, llarp_time_t dlt) const = 0;
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/// send routing message and increment sequence number
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virtual bool
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SendRoutingMessage(const llarp::routing::IMessage* msg,
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llarp::Router* r) = 0;
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// handle data in upstream direction
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virtual bool
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HandleUpstream(llarp_buffer_t X, const TunnelNonce& Y,
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llarp::Router* r) = 0;
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// handle data in downstream direction
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virtual bool
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HandleDownstream(llarp_buffer_t X, const TunnelNonce& Y,
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llarp::Router* r) = 0;
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uint64_t
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NextSeqNo()
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{
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return m_SequenceNum++;
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}
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protected:
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uint64_t m_SequenceNum = 0;
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};
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struct TransitHop : public IHopHandler,
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public llarp::routing::IMessageHandler
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{
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TransitHop();
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TransitHop(const TransitHop& other);
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TransitHopInfo info;
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SharedSecret pathKey;
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ShortHash nonceXOR;
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llarp_time_t started = 0;
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// 10 minutes default
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llarp_time_t lifetime = DEFAULT_PATH_LIFETIME;
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llarp_proto_version_t version;
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bool
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IsEndpoint(const RouterID& us) const
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{
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return info.upstream == us;
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}
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llarp_time_t
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ExpireTime() const;
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llarp::routing::InboundMessageParser m_MessageParser;
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friend std::ostream&
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operator<<(std::ostream& out, const TransitHop& h)
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{
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return out << "[TransitHop " << h.info << " started=" << h.started
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<< " lifetime=" << h.lifetime << "]";
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}
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bool
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Expired(llarp_time_t now) const override;
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bool
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ExpiresSoon(llarp_time_t now, llarp_time_t dlt) const override
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{
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return now >= ExpireTime() - dlt;
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}
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// send routing message when end of path
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bool
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SendRoutingMessage(const llarp::routing::IMessage* msg,
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llarp::Router* r) override;
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// handle routing message when end of path
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bool
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HandleRoutingMessage(const llarp::routing::IMessage* msg,
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llarp::Router* r);
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bool
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HandleDataDiscardMessage(const llarp::routing::DataDiscardMessage* msg,
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llarp::Router* r) override;
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bool
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HandlePathConfirmMessage(const llarp::routing::PathConfirmMessage* msg,
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llarp::Router* r) override;
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bool
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HandlePathTransferMessage(const llarp::routing::PathTransferMessage* msg,
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llarp::Router* r) override;
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bool
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HandlePathLatencyMessage(const llarp::routing::PathLatencyMessage* msg,
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llarp::Router* r) override;
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bool
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HandleObtainExitMessage(const llarp::routing::ObtainExitMessage* msg,
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llarp::Router* r) override;
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bool
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HandleUpdateExitVerifyMessage(
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const llarp::routing::UpdateExitVerifyMessage* msg,
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llarp::Router* r) override;
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bool
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HandleTransferTrafficMessage(
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const llarp::routing::TransferTrafficMessage* msg,
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llarp::Router* r) override;
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bool
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HandleUpdateExitMessage(const llarp::routing::UpdateExitMessage* msg,
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llarp::Router* r) override;
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bool
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HandleGrantExitMessage(const llarp::routing::GrantExitMessage* msg,
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llarp::Router* r) override;
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bool
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HandleRejectExitMessage(const llarp::routing::RejectExitMessage* msg,
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llarp::Router* r) override;
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bool
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HandleCloseExitMessage(const llarp::routing::CloseExitMessage* msg,
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llarp::Router* r) override;
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bool
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HandleHiddenServiceFrame(__attribute__((
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unused)) const llarp::service::ProtocolFrame* frame) override
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{
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/// TODO: implement me
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llarp::LogWarn("Got hidden service data on transit hop");
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return false;
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}
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bool
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HandleGotIntroMessage(const llarp::dht::GotIntroMessage* msg);
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bool
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HandleDHTMessage(const llarp::dht::IMessage* msg,
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llarp::Router* r) override;
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// handle data in upstream direction
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bool
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HandleUpstream(llarp_buffer_t X, const TunnelNonce& Y,
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llarp::Router* r) override;
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// handle data in downstream direction
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bool
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HandleDownstream(llarp_buffer_t X, const TunnelNonce& Y,
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llarp::Router* r) override;
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};
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/// configuration for a single hop when building a path
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struct PathHopConfig
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{
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/// path id
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PathID_t txID, rxID;
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// router contact of router
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RouterContact rc;
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// temp public encryption key
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SecretKey commkey;
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/// shared secret at this hop
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SharedSecret shared;
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/// hash of shared secret used for nonce mutation
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ShortHash nonceXOR;
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/// next hop's router id
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RouterID upstream;
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/// nonce for key exchange
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TunnelNonce nonce;
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// lifetime
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llarp_time_t lifetime = DEFAULT_PATH_LIFETIME;
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~PathHopConfig();
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PathHopConfig();
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};
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/// A path we made
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struct Path : public IHopHandler, public llarp::routing::IMessageHandler
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{
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using BuildResultHookFunc = std::function< void(Path*) >;
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using CheckForDeadFunc = std::function< bool(Path*, llarp_time_t) >;
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using DropHandlerFunc =
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std::function< bool(Path*, const PathID_t&, uint64_t) >;
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using HopList = std::vector< PathHopConfig >;
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using DataHandlerFunc =
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std::function< bool(Path*, const service::ProtocolFrame*) >;
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using ExitUpdatedFunc = std::function< bool(Path*) >;
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using ExitClosedFunc = std::function< bool(Path*) >;
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using ExitTrafficHandlerFunc =
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std::function< bool(Path*, llarp_buffer_t, uint64_t) >;
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/// (path, backoff) backoff is 0 on success
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using ObtainedExitHandler = std::function< bool(Path*, llarp_time_t) >;
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HopList hops;
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PathSet* m_PathSet;
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llarp::service::Introduction intro;
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llarp_time_t buildStarted;
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Path(const std::vector< RouterContact >& routers, PathSet* parent,
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PathRole startingRoles);
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PathRole
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Role() const
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{
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return _role;
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}
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void
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MarkActive(llarp_time_t now)
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{
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m_LastRecvMessage = std::max(now, m_LastRecvMessage);
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}
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/// return true if ALL of the specified roles are supported
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bool
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SupportsAllRoles(PathRole roles) const
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{
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return (_role & roles) == roles;
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}
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/// return true if ANY of the specified roles are supported
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bool
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SupportsAnyRoles(PathRole roles) const
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{
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return roles == ePathRoleAny || (_role & roles) != 0;
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}
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PathStatus
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Status() const
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{
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return _status;
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}
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void
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SetBuildResultHook(BuildResultHookFunc func);
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void
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SetExitTrafficHandler(ExitTrafficHandlerFunc handler)
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{
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m_ExitTrafficHandler = handler;
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}
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void
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SetCloseExitFunc(ExitClosedFunc handler)
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{
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m_ExitClosed = handler;
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}
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void
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SetUpdateExitFunc(ExitUpdatedFunc handler)
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{
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m_ExitUpdated = handler;
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}
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void
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SetDataHandler(DataHandlerFunc func)
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{
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m_DataHandler = func;
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}
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void
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SetDropHandler(DropHandlerFunc func)
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{
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m_DropHandler = func;
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}
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void
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SetDeadChecker(CheckForDeadFunc func)
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{
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m_CheckForDead = func;
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}
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void
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EnterState(PathStatus st, llarp_time_t now);
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llarp_time_t
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ExpireTime() const
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{
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return buildStarted + hops[0].lifetime;
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}
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bool
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ExpiresSoon(llarp_time_t now, llarp_time_t dlt = 5000) const override
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{
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return now >= (ExpireTime() - dlt);
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}
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bool
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Expired(llarp_time_t now) const override;
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void
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Tick(llarp_time_t now, llarp::Router* r);
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bool
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SendRoutingMessage(const llarp::routing::IMessage* msg,
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llarp::Router* r) override;
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bool
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HandleObtainExitMessage(const llarp::routing::ObtainExitMessage* msg,
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llarp::Router* r) override;
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bool
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HandleUpdateExitVerifyMessage(
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const llarp::routing::UpdateExitVerifyMessage* msg,
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llarp::Router* r) override;
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bool
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HandleTransferTrafficMessage(
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const llarp::routing::TransferTrafficMessage* msg,
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llarp::Router* r) override;
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bool
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HandleUpdateExitMessage(const llarp::routing::UpdateExitMessage* msg,
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llarp::Router* r) override;
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bool
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HandleCloseExitMessage(const llarp::routing::CloseExitMessage* msg,
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llarp::Router* r) override;
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bool
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HandleGrantExitMessage(const llarp::routing::GrantExitMessage* msg,
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llarp::Router* r) override;
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bool
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HandleRejectExitMessage(const llarp::routing::RejectExitMessage* msg,
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llarp::Router* r) override;
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bool
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HandleDataDiscardMessage(const llarp::routing::DataDiscardMessage* msg,
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llarp::Router* r) override;
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bool
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HandlePathConfirmMessage(const llarp::routing::PathConfirmMessage* msg,
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llarp::Router* r) override;
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bool
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HandlePathLatencyMessage(const llarp::routing::PathLatencyMessage* msg,
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llarp::Router* r) override;
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bool
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HandlePathTransferMessage(const llarp::routing::PathTransferMessage* msg,
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llarp::Router* r) override;
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bool
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HandleHiddenServiceFrame(
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const llarp::service::ProtocolFrame* frame) override;
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bool
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HandleGotIntroMessage(const llarp::dht::GotIntroMessage* msg);
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bool
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HandleDHTMessage(const llarp::dht::IMessage* msg,
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llarp::Router* r) override;
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bool
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HandleRoutingMessage(llarp_buffer_t buf, llarp::Router* r);
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// handle data in upstream direction
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bool
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HandleUpstream(llarp_buffer_t X, const TunnelNonce& Y,
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llarp::Router* r) override;
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// handle data in downstream direction
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bool
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HandleDownstream(llarp_buffer_t X, const TunnelNonce& Y,
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llarp::Router* r) override;
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bool
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IsReady() const;
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// Is this deprecated?
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// nope not deprecated :^DDDD
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const PathID_t&
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TXID() const;
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RouterID
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Endpoint() const;
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PubKey
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EndpointPubKey() const;
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bool
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IsEndpoint(const RouterID& router, const PathID_t& path) const;
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const PathID_t&
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RXID() const;
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RouterID
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Upstream() const;
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std::string
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Name() const;
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void
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AddObtainExitHandler(ObtainedExitHandler handler)
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{
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m_ObtainedExitHooks.push_back(handler);
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}
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bool
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SendExitRequest(const llarp::routing::ObtainExitMessage* msg,
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llarp::Router* r);
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bool
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SendExitClose(const llarp::routing::CloseExitMessage* msg,
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llarp::Router* r);
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protected:
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llarp::routing::InboundMessageParser m_InboundMessageParser;
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private:
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/// call obtained exit hooks
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bool
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InformExitResult(llarp_time_t b);
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BuildResultHookFunc m_BuiltHook;
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DataHandlerFunc m_DataHandler;
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DropHandlerFunc m_DropHandler;
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CheckForDeadFunc m_CheckForDead;
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ExitUpdatedFunc m_ExitUpdated;
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ExitClosedFunc m_ExitClosed;
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ExitTrafficHandlerFunc m_ExitTrafficHandler;
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std::vector< ObtainedExitHandler > m_ObtainedExitHooks;
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llarp_time_t m_LastRecvMessage = 0;
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llarp_time_t m_LastLatencyTestTime = 0;
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uint64_t m_LastLatencyTestID = 0;
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uint64_t m_UpdateExitTX = 0;
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uint64_t m_CloseExitTX = 0;
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uint64_t m_ExitObtainTX = 0;
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PathStatus _status;
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PathRole _role;
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};
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enum PathBuildStatus
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{
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ePathBuildSuccess,
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ePathBuildTimeout,
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ePathBuildReject
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};
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struct PathContext
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{
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PathContext(llarp::Router* router);
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~PathContext();
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/// called from router tick function
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void
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ExpirePaths(llarp_time_t now);
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/// called from router tick function
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/// builds all paths we need to build at current tick
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void
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BuildPaths(llarp_time_t now);
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/// called from router tick function
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void
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TickPaths(llarp_time_t now);
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/// track a path builder with this context
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void
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AddPathBuilder(Builder* set);
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void
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AllowTransit();
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void
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RejectTransit();
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bool
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AllowingTransit() const;
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bool
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HasTransitHop(const TransitHopInfo& info);
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bool
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HandleRelayCommit(const LR_CommitMessage* msg);
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void
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PutTransitHop(std::shared_ptr< TransitHop > hop);
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IHopHandler*
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GetByUpstream(const RouterID& id, const PathID_t& path);
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bool
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TransitHopPreviousIsRouter(const PathID_t& path, const RouterID& r);
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IHopHandler*
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GetPathForTransfer(const PathID_t& topath);
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IHopHandler*
|
|
GetByDownstream(const RouterID& id, const PathID_t& path);
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|
|
|
PathSet*
|
|
GetLocalPathSet(const PathID_t& id);
|
|
|
|
routing::IMessageHandler*
|
|
GetHandler(const PathID_t& id);
|
|
|
|
bool
|
|
ForwardLRCM(const RouterID& nextHop,
|
|
const std::array< EncryptedFrame, 8 >& frames);
|
|
|
|
bool
|
|
HopIsUs(const RouterID& k) const;
|
|
|
|
bool
|
|
HandleLRUM(const RelayUpstreamMessage* msg);
|
|
|
|
bool
|
|
HandleLRDM(const RelayDownstreamMessage* msg);
|
|
|
|
void
|
|
AddOwnPath(PathSet* set, Path* p);
|
|
|
|
void
|
|
RemovePathBuilder(Builder* ctx);
|
|
|
|
void
|
|
RemovePathSet(PathSet* set);
|
|
|
|
using TransitHopsMap_t =
|
|
std::multimap< PathID_t, std::shared_ptr< TransitHop > >;
|
|
|
|
using SyncTransitMap_t = std::pair< util::Mutex, TransitHopsMap_t >;
|
|
|
|
// maps path id -> pathset owner of path
|
|
using OwnedPathsMap_t = std::map< PathID_t, PathSet* >;
|
|
|
|
using SyncOwnedPathsMap_t = std::pair< util::Mutex, OwnedPathsMap_t >;
|
|
|
|
llarp_threadpool*
|
|
Worker();
|
|
|
|
llarp::Crypto*
|
|
Crypto();
|
|
|
|
llarp::Logic*
|
|
Logic();
|
|
|
|
llarp::Router*
|
|
Router();
|
|
|
|
byte_t*
|
|
EncryptionSecretKey();
|
|
|
|
const byte_t*
|
|
OurRouterID() const;
|
|
|
|
private:
|
|
llarp::Router* m_Router;
|
|
SyncTransitMap_t m_TransitPaths;
|
|
SyncTransitMap_t m_Paths;
|
|
SyncOwnedPathsMap_t m_OurPaths;
|
|
std::list< Builder* > m_PathBuilders;
|
|
bool m_AllowTransit;
|
|
};
|
|
} // namespace path
|
|
} // namespace llarp
|
|
|
|
#endif
|