pcap-helper.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014-2022,  Regents of the University of California,
 *                           Arizona Board of Regents,
 *                           Colorado State University,
 *                           University Pierre & Marie Curie, Sorbonne University,
 *                           Washington University in St. Louis,
 *                           Beijing Institute of Technology,
 *                           The University of Memphis.
 *
 * This file is part of NFD (Named Data Networking Forwarding Daemon).
 * See AUTHORS.md for complete list of NFD authors and contributors.
 *
 * NFD is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef NFD_DAEMON_FACE_PCAP_HELPER_HPP
#define NFD_DAEMON_FACE_PCAP_HELPER_HPP
 
#include "core/common.hpp"
 
#ifndef NFD_HAVE_LIBPCAP
#error "Cannot include this file when libpcap is not available"
#endif
 
// forward declarations
struct pcap;
typedef pcap pcap_t;
 
namespace nfd::face {
 
class PcapHelper : noncopyable
{
public:
  class Error : public std::runtime_error
  {
  public:
    using std::runtime_error::runtime_error;
  };
 
  explicit
  PcapHelper(const std::string& interfaceName);
 
  ~PcapHelper() noexcept;
 
  void
  activate(int dlt);
 
  void
  close() noexcept;
 
  int
  getFd() const;
 
  std::string
  getLastError() const noexcept;
 
  size_t
  getNDropped() const;
 
  void
  setPacketFilter(const char* filter) const;
 
  std::tuple<span<const uint8_t>, std::string>
  readNextPacket() const noexcept;
 
  operator pcap_t*() const noexcept
  {
    return m_pcap;
  }
 
private:
  pcap_t* m_pcap = nullptr;
};
 
} // namespace nfd::face
 
#endif // NFD_DAEMON_FACE_PCAP_HELPER_HPP