udp_receiver.cpp

/* ========================= eCAL LICENSE =================================
 *
 * Copyright (C) 2016 - 2019 Continental Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * ========================= eCAL LICENSE =================================
*/

/**
 * @brief  UDP receiver class
**/

#include <iostream>

#include "udp_receiver.h"

#include <ecal/ecal_config.h>

#include "io/udp_receiver_base.h"
#include "io/udp_receiver_asio.h"
#ifdef ECAL_NPCAP_SUPPORT
#include "io/udp_receiver_npcap.h"
#endif

namespace eCAL
{
  ////////////////////////////////////////////////////////
  // udp receiver class
  ////////////////////////////////////////////////////////
  CUDPReceiver::CUDPReceiver()
    : CReceiver(CReceiver::SType_ReceiverUDP)
    , m_use_npcap(false)
  {
#ifdef ECAL_NPCAP_SUPPORT
    if (Config::IsNpcapEnabled())
    {
      m_use_npcap = Udpcap::Initialize(); // Only use NPCAP if we can initialize it (or it has already been initialized successfully)
      if (!m_use_npcap)
      {
        std::cerr << "Npcap is enabled, but cannot be initialized. Using socket fallback mode." << std::endl;
      }
    }
#endif //ECAL_NPCAP_SUPPORT
  }

  bool CUDPReceiver::Create(const SReceiverAttr& attr_)
  {
    if (m_socket_impl) return false;

#ifdef ECAL_NPCAP_SUPPORT
    if (m_use_npcap)
    {
      m_socket_impl = std::make_shared<CUDPReceiverPcap>(attr_);
      return true;
    }
#endif // ECAL_NPCAP_SUPPORT

    m_socket_impl = std::make_shared<CUDPReceiverAsio>(attr_);
    return(true);
  }

  bool CUDPReceiver::Destroy()
  {
    if (!m_socket_impl) return(false);

    const std::lock_guard<std::mutex> lock(m_socket_mtx);
    m_socket_impl.reset();

    return(true);
  }

  bool CUDPReceiver::AddMultiCastGroup(const char* ipaddr_)
  {
    if (!m_socket_impl) return(false);
    
    const std::lock_guard<std::mutex> lock(m_socket_mtx);
    return(m_socket_impl->AddMultiCastGroup(ipaddr_));
  }

  bool CUDPReceiver::RemMultiCastGroup(const char* ipaddr_)
  {
    if (!m_socket_impl) return(false);

    const std::lock_guard<std::mutex> lock(m_socket_mtx);
    return(m_socket_impl->RemMultiCastGroup(ipaddr_));
  }

  size_t CUDPReceiver::Receive(char* buf_, size_t len_, int timeout_, ::sockaddr_in* address_ /* = nullptr */)
  {
    if (!m_socket_impl) return(0);

    const std::lock_guard<std::mutex> lock(m_socket_mtx);
    return(m_socket_impl->Receive(buf_, len_, timeout_, address_));
  }
}