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387 lines
9.6 KiB
C++
387 lines
9.6 KiB
C++
#ifndef LLARP_PATH_HPP
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#define LLARP_PATH_HPP
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#include <llarp/path.h>
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#include <llarp/router.h>
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#include <llarp/time.h>
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#include <llarp/aligned.hpp>
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#include <llarp/crypto.hpp>
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#include <llarp/dht.hpp>
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#include <llarp/endpoint.hpp>
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#include <llarp/messages/relay.hpp>
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#include <llarp/messages/relay_commit.hpp>
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#include <llarp/path_types.hpp>
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#include <llarp/pathset.hpp>
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#include <llarp/router_id.hpp>
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#include <llarp/routing/handler.hpp>
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#include <llarp/routing/message.hpp>
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#include <llarp/service/Intro.hpp>
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#include <functional>
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#include <list>
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#include <map>
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#include <mutex>
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#include <unordered_map>
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#include <vector>
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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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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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};
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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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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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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;
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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, llarp_router* r);
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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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HandlePathConfirmMessage(const llarp::routing::PathConfirmMessage* msg,
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llarp_router* r);
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bool
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HandlePathTransferMessage(const llarp::routing::PathTransferMessage* msg,
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llarp_router* r);
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bool
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HandlePathLatencyMessage(const llarp::routing::PathLatencyMessage* msg,
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llarp_router* r);
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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, 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, llarp_router* r);
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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, llarp_router* r);
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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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llarp_rc router;
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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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/// 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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typedef std::function< void(Path*) > BuildResultHookFunc;
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typedef std::vector< PathHopConfig > HopList;
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HopList hops;
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llarp::service::Introduction intro;
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llarp_time_t buildStarted;
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PathStatus status;
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Path(llarp_path_hops* path);
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void
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SetBuildResultHook(BuildResultHookFunc func);
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bool
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Expired(llarp_time_t now) const;
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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, llarp_router* r);
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bool
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HandlePathConfirmMessage(const llarp::routing::PathConfirmMessage* msg,
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llarp_router* r);
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bool
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HandlePathLatencyMessage(const llarp::routing::PathLatencyMessage* msg,
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llarp_router* r);
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bool
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HandlePathTransferMessage(const llarp::routing::PathTransferMessage* msg,
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llarp_router* r);
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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, llarp_router* r);
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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, llarp_router* r);
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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, llarp_router* r);
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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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const PathID_t&
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RXID() const;
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RouterID
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Upstream() const;
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protected:
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llarp::routing::InboundMessageParser m_InboundMessageParser;
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private:
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BuildResultHookFunc m_BuiltHook;
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llarp_time_t m_LastLatencyTestTime = 0;
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uint64_t m_LastLatencyTestID = 0;
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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();
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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();
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/// called from router tick function
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void
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TickPaths();
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/// track a path builder with this context
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void
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AddPathBuilder(llarp_pathbuilder_context* 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(TransitHop* hop);
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IHopHandler*
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GetByUpstream(const RouterID& id, const PathID_t& path);
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IHopHandler*
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GetByDownstream(const RouterID& id, const PathID_t& path);
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PathSet*
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GetLocalPathSet(const PathID_t& id);
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bool
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ForwardLRCM(const RouterID& nextHop,
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std::deque< EncryptedFrame >& frames);
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bool
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HopIsUs(const PubKey& k) const;
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bool
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HandleLRUM(const RelayUpstreamMessage* msg);
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bool
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HandleLRDM(const RelayDownstreamMessage* msg);
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void
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AddOwnPath(PathSet* set, Path* p);
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typedef std::multimap< PathID_t, TransitHop* > TransitHopsMap_t;
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typedef std::pair< std::mutex, TransitHopsMap_t > SyncTransitMap_t;
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// maps path id -> pathset owner of path
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typedef std::map< PathID_t, PathSet* > OwnedPathsMap_t;
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typedef std::pair< std::mutex, OwnedPathsMap_t > SyncOwnedPathsMap_t;
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llarp_threadpool*
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Worker();
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llarp_crypto*
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Crypto();
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llarp_logic*
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Logic();
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llarp_router*
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Router();
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byte_t*
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EncryptionSecretKey();
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const byte_t*
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OurRouterID() const;
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private:
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llarp_router* m_Router;
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SyncTransitMap_t m_TransitPaths;
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SyncTransitMap_t m_Paths;
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SyncOwnedPathsMap_t m_OurPaths;
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std::list< llarp_pathbuilder_context* > m_PathBuilders;
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bool m_AllowTransit;
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};
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} // namespace path
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} // namespace llarp
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#endif
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