ethernet-transport.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef NFD_DAEMON_FACE_ETHERNET_TRANSPORT_HPP
#define NFD_DAEMON_FACE_ETHERNET_TRANSPORT_HPP

#include "core/common.hpp"
#include "transport.hpp"
#include "core/network-interface.hpp"

#ifndef HAVE_LIBPCAP
#error "Cannot include this file when libpcap is not available"
#endif

// forward declarations
struct pcap;
typedef pcap pcap_t;
struct pcap_pkthdr;

namespace nfd {
namespace face {

class EthernetTransport final : public Transport
{
public:
  class Error : public std::runtime_error
  {
  public:
    explicit
    Error(const std::string& what)
      : std::runtime_error(what)
    {
    }
  };

  EthernetTransport(const NetworkInterfaceInfo& interface,
                    const ethernet::Address& mcastAddress);

protected:
  virtual void
  beforeChangePersistency(ndn::nfd::FacePersistency newPersistency) final;

  virtual void
  doClose() final;

private:
  virtual void
  doSend(Transport::Packet&& packet) final;

  void
  pcapInit();

  void
  setPacketFilter(const char* filterString);

  bool
  joinMulticastGroup();

  void
  sendPacket(const ndn::Block& block);

  void
  handleRead(const boost::system::error_code& error, size_t nBytesRead);

PUBLIC_WITH_TESTS_ELSE_PRIVATE:
  void
  processIncomingPacket(const pcap_pkthdr* header, const uint8_t* packet);

private:
  void
  processErrorCode(const boost::system::error_code& error);

  size_t
  getInterfaceMtu();

private:
  unique_ptr<pcap_t, void(*)(pcap_t*)> m_pcap;
  boost::asio::posix::stream_descriptor m_socket;

  ethernet::Address m_srcAddress;
  ethernet::Address m_destAddress;
  std::string m_interfaceName;
#if defined(__linux__)
  int m_interfaceIndex;
#endif

#ifdef _DEBUG
  unsigned int m_nDropped;
#endif
};

} // namespace face
} // namespace nfd

#endif // NFD_DAEMON_FACE_ETHERNET_TRANSPORT_HPP