lokinet/llarp/exit/session.hpp

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#ifndef LLARP_EXIT_SESSION_HPP
#define LLARP_EXIT_SESSION_HPP
#include <messages/exit.hpp>
#include <messages/transfer_traffic.hpp>
#include <net/ip.hpp>
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#include <path/pathbuilder.hpp>
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#include <deque>
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#include <queue>
namespace llarp
{
namespace exit
{
struct BaseSession;
using SessionReadyFunc = std::function< void(BaseSession*) >;
/// a persisting exit session with an exit router
struct BaseSession : public llarp::path::Builder
{
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static constexpr size_t MaxUpstreamQueueLength = 256;
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static constexpr llarp_time_t LifeSpan = 60 * 10 * 1000;
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BaseSession(const llarp::RouterID& exitRouter,
std::function< bool(const llarp_buffer_t&) > writepkt,
AbstractRouter* r, size_t numpaths, size_t hoplen);
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virtual ~BaseSession();
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util::StatusObject
ExtractStatus() const override;
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bool
SelectHop(llarp_nodedb* db, const RouterContact& prev, RouterContact& cur,
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size_t hop, llarp::path::PathRole roles) override;
bool
ShouldBuildMore(llarp_time_t now) const override;
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void
HandlePathBuilt(llarp::path::Path* p) override;
bool
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QueueUpstreamTraffic(llarp::net::IPv4Packet pkt, const size_t packSize);
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/// flush upstream and downstream traffic
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bool
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Flush();
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path::PathRole
GetRoles() const override
{
return path::ePathRoleExit;
}
/// send close and stop session
bool
Stop() override;
bool
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IsReady() const;
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const llarp::RouterID
Endpoint() const
{
return m_ExitRouter;
}
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bool
IsExpired(llarp_time_t now) const;
bool
LoadIdentityFromFile(const char* fname);
void
AddReadyHook(SessionReadyFunc func);
protected:
llarp::RouterID m_ExitRouter;
llarp::SecretKey m_ExitIdentity;
std::function< bool(const llarp_buffer_t&) > m_WritePacket;
virtual void
PopulateRequest(llarp::routing::ObtainExitMessage& msg) const = 0;
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bool
HandleTrafficDrop(llarp::path::Path* p, const llarp::PathID_t& path,
uint64_t s);
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bool
HandleGotExit(llarp::path::Path* p, llarp_time_t b);
bool
HandleTraffic(llarp::path::Path* p, const llarp_buffer_t& buf,
uint64_t seqno);
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private:
using UpstreamTrafficQueue_t =
std::deque< llarp::routing::TransferTrafficMessage >;
using TieredQueue_t = std::map< uint8_t, UpstreamTrafficQueue_t >;
TieredQueue_t m_Upstream;
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using DownstreamPkt = std::pair< uint64_t, llarp::net::IPv4Packet >;
struct DownstreamPktSorter
{
bool
operator()(const DownstreamPkt& left, const DownstreamPkt& right) const
{
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return left.first < right.first;
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}
};
using DownstreamTrafficQueue_t =
std::priority_queue< DownstreamPkt, std::vector< DownstreamPkt >,
DownstreamPktSorter >;
DownstreamTrafficQueue_t m_Downstream;
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uint64_t m_Counter;
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llarp_time_t m_LastUse;
std::vector< SessionReadyFunc > m_PendingCallbacks;
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void
CallPendingCallbacks(bool success);
};
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struct ExitSession final : public BaseSession
{
ExitSession(const llarp::RouterID& snodeRouter,
std::function< bool(const llarp_buffer_t&) > writepkt,
AbstractRouter* r, size_t numpaths, size_t hoplen)
: BaseSession(snodeRouter, writepkt, r, numpaths, hoplen){};
~ExitSession(){};
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std::string
Name() const override;
protected:
virtual void
PopulateRequest(llarp::routing::ObtainExitMessage& msg) const override
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{
// TODO: set expiration time
msg.X = 0;
msg.E = 1;
}
};
struct SNodeSession final : public BaseSession
{
SNodeSession(const llarp::RouterID& snodeRouter,
std::function< bool(const llarp_buffer_t&) > writepkt,
AbstractRouter* r, size_t numpaths, size_t hoplen,
bool useRouterSNodeKey = false);
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~SNodeSession(){};
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std::string
Name() const override;
protected:
void
PopulateRequest(llarp::routing::ObtainExitMessage& msg) const override
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{
// TODO: set expiration time
msg.X = 0;
msg.E = 0;
}
};
} // namespace exit
} // namespace llarp
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#endif