lokinet/include/llarp/path.hpp
Jeff Becker 6ad79b97dc
broken
2018-07-09 13:32:11 -04:00

387 lines
9.7 KiB
C++

#ifndef LLARP_PATH_HPP
#define LLARP_PATH_HPP
#include <llarp/path.h>
#include <llarp/router.h>
#include <llarp/time.h>
#include <llarp/aligned.hpp>
#include <llarp/crypto.hpp>
#include <llarp/dht.hpp>
#include <llarp/endpoint.hpp>
#include <llarp/messages/relay.hpp>
#include <llarp/messages/relay_commit.hpp>
#include <llarp/path_types.hpp>
#include <llarp/pathset.hpp>
#include <llarp/router_id.hpp>
#include <llarp/routing/handler.hpp>
#include <llarp/routing/message.hpp>
#include <list>
#include <map>
#include <mutex>
#include <unordered_map>
#include <vector>
namespace llarp
{
namespace path
{
struct TransitHopInfo
{
TransitHopInfo() = default;
TransitHopInfo(const TransitHopInfo& other);
TransitHopInfo(const RouterID& down, const LR_CommitRecord& record);
PathID_t txID, rxID;
RouterID upstream;
RouterID downstream;
friend std::ostream&
operator<<(std::ostream& out, const TransitHopInfo& info)
{
out << "<tx=" << info.txID << " rx=" << info.rxID;
out << " upstream=" << info.upstream
<< " downstream=" << info.downstream;
return out << ">";
}
bool
operator==(const TransitHopInfo& other) const
{
return txID == other.txID && rxID == other.rxID
&& upstream == other.upstream && downstream == other.downstream;
}
bool
operator!=(const TransitHopInfo& other) const
{
return !(*this == other);
}
bool
operator<(const TransitHopInfo& other) const
{
return txID < other.txID || rxID < other.rxID
|| upstream < other.upstream || downstream < other.downstream;
}
struct Hash
{
std::size_t
operator()(TransitHopInfo const& a) const
{
std::size_t idx0, idx1, idx2, idx3;
memcpy(&idx0, a.upstream, sizeof(std::size_t));
memcpy(&idx1, a.downstream, sizeof(std::size_t));
memcpy(&idx2, a.txID, sizeof(std::size_t));
memcpy(&idx3, a.rxID, sizeof(std::size_t));
return idx0 ^ idx1 ^ idx2;
}
};
};
struct PathIDHash
{
std::size_t
operator()(const PathID_t& a) const
{
std::size_t idx0;
memcpy(&idx0, a, sizeof(std::size_t));
return idx0;
}
};
struct IHopHandler
{
virtual ~IHopHandler(){};
virtual bool
Expired(llarp_time_t now) const = 0;
virtual bool
SendRoutingMessage(const llarp::routing::IMessage* msg,
llarp_router* r) = 0;
// handle data in upstream direction
virtual bool
HandleUpstream(llarp_buffer_t X, const TunnelNonce& Y,
llarp_router* r) = 0;
// handle data in downstream direction
virtual bool
HandleDownstream(llarp_buffer_t X, const TunnelNonce& Y,
llarp_router* r) = 0;
};
struct TransitHop : public IHopHandler,
public llarp::routing::IMessageHandler
{
TransitHop();
TransitHop(const TransitHop& other);
TransitHopInfo info;
SharedSecret pathKey;
llarp_time_t started = 0;
// 10 minutes default
llarp_time_t lifetime = DEFAULT_PATH_LIFETIME;
llarp_proto_version_t version;
llarp::routing::InboundMessageParser m_MessageParser;
friend std::ostream&
operator<<(std::ostream& out, const TransitHop& h)
{
return out << "[TransitHop " << h.info << " started=" << h.started
<< " lifetime=" << h.lifetime << "]";
}
bool
Expired(llarp_time_t now) const;
// send routing message when end of path
bool
SendRoutingMessage(const llarp::routing::IMessage* msg, llarp_router* r);
// handle routing message when end of path
bool
HandleRoutingMessage(const llarp::routing::IMessage* msg,
llarp_router* r);
bool
HandlePathConfirmMessage(const llarp::routing::PathConfirmMessage* msg,
llarp_router* r);
bool
HandlePathTransferMessage(const llarp::routing::PathTransferMessage* msg,
llarp_router* r);
bool
HandlePathLatencyMessage(const llarp::routing::PathLatencyMessage* msg,
llarp_router* r);
bool
HandleGotIntroMessage(const llarp::dht::GotIntroMessage* msg);
bool
HandleDHTMessage(const llarp::dht::IMessage* msg, llarp_router* r);
bool
HandleHiddenServiceData(llarp_buffer_t buf, llarp_router* r);
// handle data in upstream direction
bool
HandleUpstream(llarp_buffer_t X, const TunnelNonce& Y, llarp_router* r);
// handle data in downstream direction
bool
HandleDownstream(llarp_buffer_t X, const TunnelNonce& Y, llarp_router* r);
};
/// configuration for a single hop when building a path
struct PathHopConfig
{
/// path id
PathID_t txID, rxID;
// router contact of router
llarp_rc router;
// temp public encryption key
SecretKey commkey;
/// shared secret at this hop
SharedSecret shared;
/// next hop's router id
RouterID upstream;
/// nonce for key exchange
TunnelNonce nonce;
// lifetime
llarp_time_t lifetime = DEFAULT_PATH_LIFETIME;
~PathHopConfig();
PathHopConfig();
};
/// A path we made
struct Path : public IHopHandler, public llarp::routing::IMessageHandler
{
typedef std::function< void(Path*) > BuildResultHookFunc;
typedef std::vector< PathHopConfig > HopList;
HopList hops;
llarp_time_t buildStarted;
PathStatus status;
Path(llarp_path_hops* path);
void
SetBuildResultHook(BuildResultHookFunc func);
bool
Expired(llarp_time_t now) const;
void
Tick(llarp_time_t now, llarp_router* r);
bool
SendRoutingMessage(const llarp::routing::IMessage* msg, llarp_router* r);
bool
HandlePathConfirmMessage(const llarp::routing::PathConfirmMessage* msg,
llarp_router* r);
bool
HandlePathLatencyMessage(const llarp::routing::PathLatencyMessage* msg,
llarp_router* r);
bool
HandlePathTransferMessage(const llarp::routing::PathTransferMessage* msg,
llarp_router* r);
bool
HandleGotIntroMessage(const llarp::dht::GotIntroMessage* msg);
bool
HandleDHTMessage(const llarp::dht::IMessage* msg, llarp_router* r);
bool
HandleRoutingMessage(llarp_buffer_t buf, llarp_router* r);
bool
HandleHiddenServiceData(llarp_buffer_t buf, llarp_router* r);
// handle data in upstream direction
bool
HandleUpstream(llarp_buffer_t X, const TunnelNonce& Y, llarp_router* r);
// handle data in downstream direction
bool
HandleDownstream(llarp_buffer_t X, const TunnelNonce& Y, llarp_router* r);
// Is this deprecated?
// nope not deprecated :^DDDD
const PathID_t&
TXID() const;
const PathID_t&
RXID() const;
RouterID
Upstream() const;
llarp_time_t Latency = 0;
protected:
llarp::routing::InboundMessageParser m_InboundMessageParser;
private:
BuildResultHookFunc m_BuiltHook;
llarp_time_t m_LastLatencyTestTime = 0;
uint64_t m_LastLatencyTestID = 0;
};
enum PathBuildStatus
{
ePathBuildSuccess,
ePathBuildTimeout,
ePathBuildReject
};
struct PathContext
{
PathContext(llarp_router* router);
~PathContext();
/// called from router tick function
void
ExpirePaths();
/// called from router tick function
/// builds all paths we need to build at current tick
void
BuildPaths();
/// called from router tick function
void
TickPaths();
/// track a path builder with this context
void
AddPathBuilder(llarp_pathbuilder_context* set);
void
AllowTransit();
void
RejectTransit();
bool
AllowingTransit() const;
bool
HasTransitHop(const TransitHopInfo& info);
bool
HandleRelayCommit(const LR_CommitMessage* msg);
void
PutTransitHop(TransitHop* hop);
IHopHandler*
GetByUpstream(const RouterID& id, const PathID_t& path);
IHopHandler*
GetByDownstream(const RouterID& id, const PathID_t& path);
PathSet*
GetLocalPathSet(const PathID_t& id);
bool
ForwardLRCM(const RouterID& nextHop,
std::deque< EncryptedFrame >& frames);
bool
HopIsUs(const PubKey& k) const;
bool
HandleLRUM(const RelayUpstreamMessage* msg);
bool
HandleLRDM(const RelayDownstreamMessage* msg);
void
AddOwnPath(PathSet* set, Path* p);
typedef std::multimap< PathID_t, TransitHop* > TransitHopsMap_t;
typedef std::pair< std::mutex, TransitHopsMap_t > SyncTransitMap_t;
// maps path id -> pathset owner of path
typedef std::map< PathID_t, PathSet* > OwnedPathsMap_t;
typedef std::pair< std::mutex, OwnedPathsMap_t > SyncOwnedPathsMap_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< llarp_pathbuilder_context* > m_PathBuilders;
bool m_AllowTransit;
};
} // namespace path
} // namespace llarp
#endif