lokinet/llarp/vpn/packet_intercept.hpp

#pragma once
#include <functional>
#include <vector>
#include <llarp/util/types.hpp>

namespace llarp::vpn
{
  using PacketSendFunc_t = std::function<void(std::vector<byte_t>)>;
  using PacketInterceptFunc_t = std::function<void(std::vector<byte_t>, PacketSendFunc_t)>;

  class I_PacketInterceptor
  {
   public:
    virtual ~I_PacketInterceptor() = default;

    /// start intercepting packets and call a callback for each one we get
    /// the callback passes in an ip packet and a function that we can use to send an ip packet to
    /// its origin
    virtual void
    start(PacketInterceptFunc_t f) = 0;

    /// stop intercepting packets
    virtual void
    stop() = 0;
  };

}  // namespace llarp::vpn