daemon/src/net/UDPConvergenceLayer.cpp

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#include "net/UDPConvergenceLayer.h"
#include "net/BundleReceivedEvent.h"
#include "core/BundleEvent.h"
#include "net/TransferCompletedEvent.h"
#include "routing/RequeueBundleEvent.h"
#include <ibrcommon/net/UnicastSocket.h>
#include <ibrcommon/net/BroadcastSocket.h>
#include "core/BundleCore.h"

#include <ibrcommon/data/BLOB.h>
#include <ibrcommon/Logger.h>
#include <ibrcommon/thread/MutexLock.h>

#include <ibrdtn/utils/Utils.h>
#include <ibrdtn/data/Serializer.h>

#include <sys/socket.h>
#include <poll.h>
#include <errno.h>

#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <limits.h>

#include <iostream>


using namespace dtn::data;

namespace dtn
{
        namespace net
        {
                const int UDPConvergenceLayer::DEFAULT_PORT = 4556;

                UDPConvergenceLayer::UDPConvergenceLayer(ibrcommon::NetInterface net, int port, bool broadcast, unsigned int mtu)
                        : _socket(NULL), _net(net), _port(port), m_maxmsgsize(mtu), _running(false)
                {
                        if (broadcast)
                        {
                                _socket = new ibrcommon::BroadcastSocket();
                        }
                        else
                        {
                                _socket = new ibrcommon::UnicastSocket();
                        }
                }

                UDPConvergenceLayer::~UDPConvergenceLayer()
                {
                        if (isRunning())
                        {
                                componentDown();
                        }

                        delete _socket;
                }

                dtn::core::Node::Protocol UDPConvergenceLayer::getDiscoveryProtocol() const
                {
                        return dtn::core::Node::CONN_UDPIP;
                }

                void UDPConvergenceLayer::update(std::string &name, std::string &params)
                {
                        name = "udpcl";

                        stringstream service; service << "ip=" << _net.getAddress() << ";port=" << _port << ";";
                        params = service.str();
                }

                bool UDPConvergenceLayer::onInterface(const ibrcommon::NetInterface &net) const
                {
                        if (_net.getInterface() == net.getInterface()) return true;
                        return false;
                }

                void UDPConvergenceLayer::queue(const dtn::core::Node &node, const ConvergenceLayer::Job &job)
                {
                        std::stringstream ss;
                        dtn::data::DefaultSerializer serializer(ss);

                        unsigned int size = serializer.getLength(job._bundle);

                        if (size > m_maxmsgsize)
                        {
                                // TODO: create a fragment of length "size"

//                              // get the payload block
//                              PayloadBlock *payload = utils::Utils::getPayloadBlock( b );
//                              size_t application_length = payload->getBLOB().getSize();
//
//                              // the new size for the payload
//                              size_t payload_size = m_maxmsgsize;
//
//                              // reduce by the overhead
//                              payload_size -= (size - application_length);
//
//                              // possible size of fragment offset and application data length
//                              payload_size -= 20;
//
//                              // split the payload block
//                              pair<PayloadBlock*, PayloadBlock*> frags = payload->split(payload_size);
//
//                              Bundle frag1 = b;
//                              frag1.clearBlocks();
//                              frag1.addBlock(frags.first);
//
//                              Bundle frag2 = b;
//                              frag2.clearBlocks();
//                              frag2.addBlock(frags.second);
//                              frag2._fragmentoffset += payload_size;
//
//                              if (!(b._procflags & Bundle::FRAGMENT))
//                              {
//                                      frag1._procflags += Bundle::FRAGMENT;
//                                      frag1._appdatalength += application_length;
//                                      frag2._procflags += Bundle::FRAGMENT;
//                                      frag2._appdatalength += application_length;
//                              }

                                // TODO: transfer the fragment

                                throw ConnectionInterruptedException();
                        }

                        serializer << job._bundle;
                        string data = ss.str();

                        // get a udp peer
                        ibrcommon::udpsocket::peer p = _socket->getPeer(node.getAddress(), node.getPort());

                        // set write lock
                        ibrcommon::MutexLock l(m_writelock);

                        // send converted line back to client.
                        int ret = p.send(data.c_str(), data.length());

                        if (ret == -1)
                        {
                                // CL is busy, requeue bundle
                                dtn::routing::RequeueBundleEvent::raise(job._destination, job._bundle);

                                return;
                        }

                        // raise bundle event
                        dtn::net::TransferCompletedEvent::raise(job._destination, job._bundle);
                        dtn::core::BundleEvent::raise(job._bundle, dtn::core::BUNDLE_FORWARDED);
                }

                UDPConvergenceLayer& UDPConvergenceLayer::operator>>(dtn::data::Bundle &bundle)
                {
                        ibrcommon::MutexLock l(m_readlock);

                        char data[m_maxmsgsize];

                        // data waiting
                        int len = _socket->receive(data, m_maxmsgsize);

                        if (len > 0)
                        {
                                // read all data into a stream
                                stringstream ss;
                                ss.write(data, len);

                                // get the bundle
                                dtn::data::DefaultDeserializer(ss, dtn::core::BundleCore::getInstance()) >> bundle;
                        }

                        return (*this);
                }

                void UDPConvergenceLayer::componentUp()
                {
                        try {
                                try {
                                        ibrcommon::UnicastSocket &sock = dynamic_cast<ibrcommon::UnicastSocket&>(*_socket);
                                        sock.bind(_port, _net);
                                } catch (std::bad_cast) {

                                }

                                try {
                                        ibrcommon::BroadcastSocket &sock = dynamic_cast<ibrcommon::BroadcastSocket&>(*_socket);
                                        sock.bind(_port, _net);
                                } catch (std::bad_cast) {

                                }

                        } catch (ibrcommon::udpsocket::SocketException ex) {
                                IBRCOMMON_LOGGER(error) << "Failed to add UDP ConvergenceLayer on " << _net.getAddress() << ":" << _port << IBRCOMMON_LOGGER_ENDL;
                                IBRCOMMON_LOGGER(error) << "      Error: " << ex.what() << IBRCOMMON_LOGGER_ENDL;
                        }
                }

                void UDPConvergenceLayer::componentDown()
                {
                        _running = false;
                        _socket->shutdown();
                        join();
                }

                void UDPConvergenceLayer::componentRun()
                {
                        _running = true;

                        while (_running)
                        {
                                try {
                                        dtn::data::Bundle bundle;
                                        (*this) >> bundle;

                                        // determine sender
                                        EID sender;

                                        // raise default bundle received event
                                        dtn::net::BundleReceivedEvent::raise(sender, bundle);

                                } catch (dtn::InvalidDataException ex) {
                                        IBRCOMMON_LOGGER(warning) << "Received a invalid bundle: " << ex.what() << IBRCOMMON_LOGGER_ENDL;
                                } catch (ibrcommon::IOException ex) {

                                }
                                yield();
                        }
                }
        }
}

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