lokinet/llarp/iwp/linklayer.hpp

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#pragma once
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#include <llarp/constants/link_layer.hpp>
#include <llarp/crypto/crypto.hpp>
#include <llarp/crypto/encrypted.hpp>
#include <llarp/crypto/types.hpp>
#include <llarp/link/server.hpp>
#include <llarp/config/key_manager.hpp>
#include <memory>
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#include <llarp/ev/ev.hpp>
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namespace llarp::iwp
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{
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struct Session;
struct LinkLayer final : public ILinkLayer
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{
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LinkLayer(
std::shared_ptr<KeyManager> keyManager,
std::shared_ptr<EventLoop> ev,
GetRCFunc getrc,
LinkMessageHandler h,
SignBufferFunc sign,
BeforeConnectFunc_t before,
SessionEstablishedHandler est,
SessionRenegotiateHandler reneg,
TimeoutHandler timeout,
SessionClosedHandler closed,
PumpDoneHandler pumpDone,
WorkerFunc_t dowork,
bool permitInbound);
std::shared_ptr<ILinkSession>
NewOutboundSession(const RouterContact& rc, const AddressInfo& ai) override;
const char*
Name() const override;
uint16_t
Rank() const override;
void
RecvFrom(const SockAddr& from, ILinkSession::Packet_t pkt) override;
void
WakeupPlaintext();
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std::string
PrintableName() const;
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private:
void
HandleWakeupPlaintext();
Replace libuv with uvw & related refactoring - removes all the llarp_ev_* functions, replacing with methods/classes/functions in the llarp namespace. - banish ev/ev.h to the void - Passes various things by const lvalue ref, especially shared_ptr's that don't need to be copied (to avoid an atomic refcount increment/decrement). - Add a llarp::UDPHandle abstract class for UDP handling - Removes the UDP tick handler; code that needs tick can just do a separate handler on the event loop outside the UDP socket. - Adds an "OwnedBuffer" which owns its own memory but is implicitly convertible to a llarp_buffer_t. This is mostly needed to take over ownership of buffers from uvw without copying them as, currently, uvw does its own allocation (pending some open upstream issues/PRs). - Logic: - add `make_caller`/`call_forever`/`call_every` utility functions to abstract Call wrapping and dependent timed tasks. - Add inLogicThread() so that code can tell its inside the logic thread (typically for debugging assertions). - get rid of janky integer returns and dealing with cancellations on call_later: the other methods added here and the event loop code remove the need for them. - Event loop: - redo everything with uvw instead of libuv - rename EventLoopWakeup::Wakeup to EventLoopWakeup::Trigger to better reflect what it does. - add EventLoopRepeater for repeated events, and replace the code that reschedules itself every time it is called with a repeater. - Split up `EventLoop::run()` into a non-virtual base method and abstract `run_loop()` methods; the base method does a couple extra setup/teardown things that don't need to be in the derived class. - udp_listen is replaced with ev->udp(...) which returns a new UDPHandle object rather that needing gross C-style-but-not-actually-C-compatible structs. - Remove unused register_poll_fd_(un)readable - Use shared_ptr for EventLoopWakeup rather than returning a raw pointer; uvw lets us not have to worry about having the event loop class maintain ownership of it. - Add factory EventLoop::create() function to create a default (uvw-based) event loop (previously this was one of the llarp_ev_blahblah unnamespaced functions). - ev_libuv: this is mostly rewritten; all of the glue code/structs, in particular, are gone as they are no longer needed with uvw. - DNS: - Rename DnsHandler to DnsInterceptor to better describe what it does (this is the code that intercepts all DNS to the tun IP range for Android). - endpoint: - remove unused "isolated network" code - remove distinct (but actually always the same) variables for router/endpoint logic objects - llarp_buffer_t - make constructors type-safe against being called with points to non-size-1 values - tun packet reading: - read all available packets off the device/file descriptor; previously we were reading one packet at a time then returning to the event loop to poll again. - ReadNextPacket() now returns a 0-size packet if the read would block (so that we can implement the previous point). - ReadNextPacket() now throws on I/O error - Miscellaneous code cleanups/simplifications
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const std::shared_ptr<EventLoopWakeup> m_Wakeup;
std::vector<ILinkSession*> m_WakingUp;
const bool m_Inbound;
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};
using LinkLayer_ptr = std::shared_ptr<LinkLayer>;
} // namespace llarp::iwp