src/nlsr.cpp - NLSR - Gitiles

 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
  * Copyright (c) 2014-2015,  The University of Memphis,
  *                           Regents of the University of California,
  *                           Arizona Board of Regents.
  *
  * This file is part of NLSR (Named-data Link State Routing).
  * See AUTHORS.md for complete list of NLSR authors and contributors.
  *
  * NLSR 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.
  *
  * NLSR 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
  * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
  **/

 #include <cstdlib>
 #include <string>
 #include <sstream>
 #include <cstdio>
 #include <unistd.h>

 #include "nlsr.hpp"
 #include "adjacent.hpp"
 #include "logger.hpp"


 namespace nlsr {

 INIT_LOGGER("nlsr");

 using namespace ndn;
 using namespace std;

 void
 Nlsr::registrationFailed(const ndn::Name& name)
 {
   std::cerr << "ERROR: Failed to register prefix in local hub's daemon" << endl;
   throw Error("Error: Prefix registration failed");
 }

 void
 Nlsr::onRegistrationSuccess(const ndn::Name& name)
 {
   if (name.equals(m_confParam.getRouterPrefix())) {
     m_lsdbDatasetHandler = std::unique_ptr<LsdbDatasetInterestHandler>(
       new LsdbDatasetInterestHandler(m_nlsrLsdb,
                                      m_nlsrFace,
                                      m_confParam.getRouterPrefix(),
                                      m_keyChain));
   }
 }

 void
 Nlsr::setInfoInterestFilter()
 {
   ndn::Name name(m_confParam.getRouterPrefix());
   _LOG_DEBUG("Setting interest filter for name: " << name);
   getNlsrFace().setInterestFilter(name,
                                   ndn::bind(&HelloProtocol::processInterest,
                                             &m_helloProtocol, _1, _2),
                                   ndn::bind(&Nlsr::onRegistrationSuccess, this, _1),
                                   ndn::bind(&Nlsr::registrationFailed, this, _1),
                                   m_defaultIdentity,
                                   ndn::nfd::ROUTE_FLAG_CAPTURE);
 }

 void
 Nlsr::setLsaInterestFilter()
 {
   ndn::Name name = m_confParam.getLsaPrefix();
   name.append(m_confParam.getSiteName());
   name.append(m_confParam.getRouterName());
   _LOG_DEBUG("Setting interest filter for name: " << name);
   getNlsrFace().setInterestFilter(name,
                                   ndn::bind(&Lsdb::processInterest,
                                             &m_nlsrLsdb, _1, _2),
                                   ndn::bind(&Nlsr::onRegistrationSuccess, this, _1),
                                   ndn::bind(&Nlsr::registrationFailed, this, _1),
                                   m_defaultIdentity,
                                   ndn::nfd::ROUTE_FLAG_CAPTURE);
 }

 void
 Nlsr::setStrategies()
 {
   std::string strategy("ndn:/localhost/nfd/strategy/broadcast");
   ndn::Name broadcastKeyPrefix = DEFAULT_BROADCAST_PREFIX;
   broadcastKeyPrefix.append("KEYS");
   m_fib.setStrategy(m_confParam.getLsaPrefix(), strategy, 0);
   m_fib.setStrategy(broadcastKeyPrefix, strategy, 0);
   m_fib.setStrategy(m_confParam.getChronosyncPrefix(), strategy, 0);
 }

 void
 Nlsr::daemonize()
 {
   pid_t process_id = 0;
   pid_t sid = 0;
   process_id = fork();
   if (process_id < 0){
     std::cerr << "Daemonization failed!" << std::endl;
     throw Error("Error: Daemonization process- fork failed!");
   }
   if (process_id > 0) {
     _LOG_DEBUG("Process daemonized. Process id: " << process_id);
     exit(0);
   }

   umask(0);
   sid = setsid();
   if(sid < 0) {
     throw Error("Error: Daemonization process- setting id failed!");
   }

   if (chdir("/") < 0) {
     throw Error("Error: Daemonization process-chdir failed!");
   }
 }

 void
 Nlsr::initialize()
 {
   _LOG_DEBUG("Initializing Nlsr");
   m_confParam.buildRouterPrefix();
   m_nlsrLsdb.setLsaRefreshTime(ndn::time::seconds(m_confParam.getLsaRefreshTime()));
   m_nlsrLsdb.setThisRouterPrefix(m_confParam.getRouterPrefix().toUri());
   m_fib.setEntryRefreshTime(2 * m_confParam.getLsaRefreshTime());
   m_sequencingManager.setSeqFileName(m_confParam.getSeqFileDir());
   m_sequencingManager.initiateSeqNoFromFile();

   m_syncLogicHandler.setSyncPrefix(m_confParam.getChronosyncPrefix().toUri());
   m_syncLogicHandler.buildUpdatePrefix();

   /* Logging start */
   m_confParam.writeLog();
   m_adjacencyList.writeLog();
   m_namePrefixList.writeLog();
   /* Logging end */
   initializeKey();
   setStrategies();
   _LOG_DEBUG("Default NLSR identity: " << m_defaultIdentity);
   setInfoInterestFilter();
   setLsaInterestFilter();

   // Set event intervals
   setFirstHelloInterval(m_confParam.getFirstHelloInterval());
   m_nlsrLsdb.setAdjLsaBuildInterval(m_confParam.getAdjLsaBuildInterval());
   m_routingTable.setRoutingCalcInterval(m_confParam.getRoutingCalcInterval());

   m_nlsrLsdb.buildAndInstallOwnNameLsa();
   m_nlsrLsdb.buildAndInstallOwnCoordinateLsa();

   registerKeyPrefix();

   m_helloProtocol.scheduleInterest(m_firstHelloInterval);

   // Need to set direct neighbors' costs to 0 for hyperbolic routing
   if (m_confParam.getHyperbolicState() == HYPERBOLIC_STATE_ON) {

     std::list<Adjacent>& neighbors = m_adjacencyList.getAdjList();

     for (std::list<Adjacent>::iterator it = neighbors.begin(); it != neighbors.end(); ++it) {
       it->setLinkCost(0);
     }
   }
 }

 void
 Nlsr::initializeKey()
 {
   m_defaultIdentity = m_confParam.getRouterPrefix();
   m_defaultIdentity.append("NLSR");

   try
   {
     m_keyChain.deleteIdentity(m_defaultIdentity);
   }
   catch (std::exception& e)
   {
   }

   ndn::Name keyName = m_keyChain.generateRsaKeyPairAsDefault(m_defaultIdentity, true);

   ndn::shared_ptr<ndn::IdentityCertificate> certificate =
     ndn::make_shared<ndn::IdentityCertificate>();
   ndn::shared_ptr<ndn::PublicKey> pubKey = m_keyChain.getPublicKey(keyName);
   Name certificateName = keyName.getPrefix(-1);
   certificateName.append("KEY").append(keyName.get(-1)).append("ID-CERT").appendVersion();
   certificate->setName(certificateName);
   certificate->setNotBefore(time::system_clock::now() - time::days(1));
   certificate->setNotAfter(time::system_clock::now() + time::days(7300)); // ~20 years
   certificate->setPublicKeyInfo(*pubKey);
   certificate->addSubjectDescription(CertificateSubjectDescription(ndn::oid::ATTRIBUTE_NAME,
                                                                    keyName.toUri()));
   certificate->encode();
   m_keyChain.signByIdentity(*certificate, m_confParam.getRouterPrefix());

   m_keyChain.addCertificateAsIdentityDefault(*certificate);
   loadCertToPublish(certificate);

   m_defaultCertName = certificate->getName();
 }

 void
 Nlsr::registerKeyPrefix()
 {
   ndn::Name keyPrefix = DEFAULT_BROADCAST_PREFIX;
   keyPrefix.append("KEYS");
   m_nlsrFace.setInterestFilter(keyPrefix,
                                ndn::bind(&Nlsr::onKeyInterest,
                                          this, _1, _2),
                                ndn::bind(&Nlsr::onKeyPrefixRegSuccess, this, _1),
                                ndn::bind(&Nlsr::registrationFailed, this, _1),
                                m_defaultIdentity,
                                ndn::nfd::ROUTE_FLAG_CAPTURE);

 }

 void
 Nlsr::onKeyInterest(const ndn::Name& name, const ndn::Interest& interest)
 {
   const ndn::Name& interestName = interest.getName();

   ndn::Name certName = interestName.getSubName(name.size());

   if (certName[-2].toUri() == "ID-CERT")
     {
       certName = certName.getPrefix(-1);
     }
   else if (certName[-1].toUri() != "ID-CERT")
     return; //Wrong key interest.

   ndn::shared_ptr<const ndn::IdentityCertificate> cert = getCertificate(certName);

   if (!static_cast<bool>(cert))
     return; // cert is not found

   ndn::shared_ptr<ndn::Data> data = ndn::make_shared<ndn::Data>();
   data->setName(interestName);
   data->setContent(cert->wireEncode());
   m_keyChain.signWithSha256(*data);

   m_nlsrFace.put(*data);
 }

 void
 Nlsr::onKeyPrefixRegSuccess(const ndn::Name& name)
 {
 }

 void
 Nlsr::onDestroyFaceSuccess(const ndn::nfd::ControlParameters& commandSuccessResult)
 {
 }

 void
 Nlsr::onDestroyFaceFailure(int32_t code, const std::string& error)
 {
   std::cerr << error << " (code: " << code << ")";
   throw Error("Error: Face destruction failed");
 }

 void
 Nlsr::destroyFaces()
 {
   std::list<Adjacent>& adjacents = m_adjacencyList.getAdjList();
   for (std::list<Adjacent>::iterator it = adjacents.begin();
        it != adjacents.end(); it++) {
     m_fib.destroyFace((*it).getConnectingFaceUri(),
                       ndn::bind(&Nlsr::onDestroyFaceSuccess, this, _1),
                       ndn::bind(&Nlsr::onDestroyFaceFailure, this, _1, _2));
   }
 }


 void
 Nlsr::onFaceEventNotification(const ndn::nfd::FaceEventNotification& faceEventNotification)
 {
   _LOG_TRACE("Nlsr::onFaceEventNotification called");
   ndn::nfd::FaceEventKind kind = faceEventNotification.getKind();

   if (kind == ndn::nfd::FACE_EVENT_DESTROYED) {
     uint64_t faceId = faceEventNotification.getFaceId();

     Adjacent* adjacent = m_adjacencyList.findAdjacent(faceId);

     if (adjacent != nullptr) {
       _LOG_DEBUG("Face to " << adjacent->getName() << " with face id: " << faceId << " destroyed");

       adjacent->setFaceId(0);

       // Only trigger an Adjacency LSA build if this node is changing from ACTIVE to INACTIVE
       // since this rebuild will effectively cancel the previous Adjacency LSA refresh event
       // and schedule a new one further in the future.
       //
       // Continuously scheduling the refresh in the future will block the router from refreshing
       // its Adjacency LSA. Since other routers' Name prefixes' expiration times are updated
       // when this router refreshes its Adjacency LSA, the other routers' prefixes will expire
       // and be removed from the RIB.
       //
       // This check is required to fix Bug #2733 for now. This check would be unnecessary
       // to fix Bug #2733 when Issue #2732 is completed, but the check also helps with
       // optimization so it can remain even when Issue #2732 is implemented.
       if (adjacent->getStatus() == Adjacent::STATUS_ACTIVE) {
         adjacent->setStatus(Adjacent::STATUS_INACTIVE);

         // A new adjacency LSA cannot be built until the neighbor is marked INACTIVE and
         // has met the HELLO retry threshold
         adjacent->setInterestTimedOutNo(m_confParam.getInterestRetryNumber());

         m_nlsrLsdb.scheduleAdjLsaBuild();
       }
     }
   }
 }


 void
 Nlsr::startEventLoop()
 {
   m_nlsrFace.processEvents();
 }

 void
 Nlsr::usage(const string& progname)
 {
   std::cout << "Usage: " << progname << " [OPTIONS...]" << std::endl;
   std::cout << "   NDN routing...." << std::endl;
   std::cout << "       -d          Run in daemon mode" << std::endl;
   std::cout << "       -f <FILE>   Specify configuration file name" << std::endl;
   std::cout << "       -V          Display version information" << std::endl;
   std::cout << "       -h          Display this help message" << std::endl;
 }


 } // namespace nlsr
	/* -- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -- */
	/**
	* Copyright (c) 2014-2015, The University of Memphis,
	* Regents of the University of California,
	* Arizona Board of Regents.
	*
	* This file is part of NLSR (Named-data Link State Routing).
	* See AUTHORS.md for complete list of NLSR authors and contributors.
	*
	* NLSR 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.
	*
	* NLSR 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
	* NLSR, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
	**/

	#include <cstdlib>
	#include <string>
	#include <sstream>
	#include <cstdio>
	#include <unistd.h>

	#include "nlsr.hpp"
	#include "adjacent.hpp"
	#include "logger.hpp"


	namespace nlsr {

	INIT_LOGGER("nlsr");

	using namespace ndn;
	using namespace std;

	void
	Nlsr::registrationFailed(const ndn::Name& name)
	{
	std::cerr << "ERROR: Failed to register prefix in local hub's daemon" << endl;
	throw Error("Error: Prefix registration failed");
	}

	void
	Nlsr::onRegistrationSuccess(const ndn::Name& name)
	{
	if (name.equals(m_confParam.getRouterPrefix())) {
	m_lsdbDatasetHandler = std::unique_ptr<LsdbDatasetInterestHandler>(
	new LsdbDatasetInterestHandler(m_nlsrLsdb,
	m_nlsrFace,
	m_confParam.getRouterPrefix(),
	m_keyChain));
	}
	}

	void
	Nlsr::setInfoInterestFilter()
	{
	ndn::Name name(m_confParam.getRouterPrefix());
	_LOG_DEBUG("Setting interest filter for name: " << name);
	getNlsrFace().setInterestFilter(name,
	ndn::bind(&HelloProtocol::processInterest,
	&m_helloProtocol, _1, _2),
	ndn::bind(&Nlsr::onRegistrationSuccess, this, _1),
	ndn::bind(&Nlsr::registrationFailed, this, _1),
	m_defaultIdentity,
	ndn::nfd::ROUTE_FLAG_CAPTURE);
	}

	void
	Nlsr::setLsaInterestFilter()
	{
	ndn::Name name = m_confParam.getLsaPrefix();
	name.append(m_confParam.getSiteName());
	name.append(m_confParam.getRouterName());
	_LOG_DEBUG("Setting interest filter for name: " << name);
	getNlsrFace().setInterestFilter(name,
	ndn::bind(&Lsdb::processInterest,
	&m_nlsrLsdb, _1, _2),
	ndn::bind(&Nlsr::onRegistrationSuccess, this, _1),
	ndn::bind(&Nlsr::registrationFailed, this, _1),
	m_defaultIdentity,
	ndn::nfd::ROUTE_FLAG_CAPTURE);
	}

	void
	Nlsr::setStrategies()
	{
	std::string strategy("ndn:/localhost/nfd/strategy/broadcast");
	ndn::Name broadcastKeyPrefix = DEFAULT_BROADCAST_PREFIX;
	broadcastKeyPrefix.append("KEYS");
	m_fib.setStrategy(m_confParam.getLsaPrefix(), strategy, 0);
	m_fib.setStrategy(broadcastKeyPrefix, strategy, 0);
	m_fib.setStrategy(m_confParam.getChronosyncPrefix(), strategy, 0);
	}

	void
	Nlsr::daemonize()
	{
	pid_t process_id = 0;
	pid_t sid = 0;
	process_id = fork();
	if (process_id < 0){
	std::cerr << "Daemonization failed!" << std::endl;
	throw Error("Error: Daemonization process- fork failed!");
	}
	if (process_id > 0) {
	_LOG_DEBUG("Process daemonized. Process id: " << process_id);
	exit(0);
	}

	umask(0);
	sid = setsid();
	if(sid < 0) {
	throw Error("Error: Daemonization process- setting id failed!");
	}

	if (chdir("/") < 0) {
	throw Error("Error: Daemonization process-chdir failed!");
	}
	}

	void
	Nlsr::initialize()
	{
	_LOG_DEBUG("Initializing Nlsr");
	m_confParam.buildRouterPrefix();
	m_nlsrLsdb.setLsaRefreshTime(ndn::time::seconds(m_confParam.getLsaRefreshTime()));
	m_nlsrLsdb.setThisRouterPrefix(m_confParam.getRouterPrefix().toUri());
	m_fib.setEntryRefreshTime(2 * m_confParam.getLsaRefreshTime());
	m_sequencingManager.setSeqFileName(m_confParam.getSeqFileDir());
	m_sequencingManager.initiateSeqNoFromFile();

	m_syncLogicHandler.setSyncPrefix(m_confParam.getChronosyncPrefix().toUri());
	m_syncLogicHandler.buildUpdatePrefix();

	/* Logging start */
	m_confParam.writeLog();
	m_adjacencyList.writeLog();
	m_namePrefixList.writeLog();
	/* Logging end */
	initializeKey();
	setStrategies();
	_LOG_DEBUG("Default NLSR identity: " << m_defaultIdentity);
	setInfoInterestFilter();
	setLsaInterestFilter();

	// Set event intervals
	setFirstHelloInterval(m_confParam.getFirstHelloInterval());
	m_nlsrLsdb.setAdjLsaBuildInterval(m_confParam.getAdjLsaBuildInterval());
	m_routingTable.setRoutingCalcInterval(m_confParam.getRoutingCalcInterval());

	m_nlsrLsdb.buildAndInstallOwnNameLsa();
	m_nlsrLsdb.buildAndInstallOwnCoordinateLsa();

	registerKeyPrefix();

	m_helloProtocol.scheduleInterest(m_firstHelloInterval);

	// Need to set direct neighbors' costs to 0 for hyperbolic routing
	if (m_confParam.getHyperbolicState() == HYPERBOLIC_STATE_ON) {

	std::list<Adjacent>& neighbors = m_adjacencyList.getAdjList();

	for (std::list<Adjacent>::iterator it = neighbors.begin(); it != neighbors.end(); ++it) {
	it->setLinkCost(0);
	}
	}
	}

	void
	Nlsr::initializeKey()
	{
	m_defaultIdentity = m_confParam.getRouterPrefix();
	m_defaultIdentity.append("NLSR");

	try
	{
	m_keyChain.deleteIdentity(m_defaultIdentity);
	}
	catch (std::exception& e)
	{
	}

	ndn::Name keyName = m_keyChain.generateRsaKeyPairAsDefault(m_defaultIdentity, true);

	ndn::shared_ptr<ndn::IdentityCertificate> certificate =
	ndn::make_shared<ndn::IdentityCertificate>();
	ndn::shared_ptr<ndn::PublicKey> pubKey = m_keyChain.getPublicKey(keyName);
	Name certificateName = keyName.getPrefix(-1);
	certificateName.append("KEY").append(keyName.get(-1)).append("ID-CERT").appendVersion();
	certificate->setName(certificateName);
	certificate->setNotBefore(time::system_clock::now() - time::days(1));
	certificate->setNotAfter(time::system_clock::now() + time::days(7300)); // ~20 years
	certificate->setPublicKeyInfo(*pubKey);
	certificate->addSubjectDescription(CertificateSubjectDescription(ndn::oid::ATTRIBUTE_NAME,
	keyName.toUri()));
	certificate->encode();
	m_keyChain.signByIdentity(*certificate, m_confParam.getRouterPrefix());

	m_keyChain.addCertificateAsIdentityDefault(*certificate);
	loadCertToPublish(certificate);

	m_defaultCertName = certificate->getName();
	}

	void
	Nlsr::registerKeyPrefix()
	{
	ndn::Name keyPrefix = DEFAULT_BROADCAST_PREFIX;
	keyPrefix.append("KEYS");
	m_nlsrFace.setInterestFilter(keyPrefix,
	ndn::bind(&Nlsr::onKeyInterest,
	this, _1, _2),
	ndn::bind(&Nlsr::onKeyPrefixRegSuccess, this, _1),
	ndn::bind(&Nlsr::registrationFailed, this, _1),
	m_defaultIdentity,
	ndn::nfd::ROUTE_FLAG_CAPTURE);

	}

	void
	Nlsr::onKeyInterest(const ndn::Name& name, const ndn::Interest& interest)
	{
	const ndn::Name& interestName = interest.getName();

	ndn::Name certName = interestName.getSubName(name.size());

	if (certName[-2].toUri() == "ID-CERT")
	{
	certName = certName.getPrefix(-1);
	}
	else if (certName[-1].toUri() != "ID-CERT")
	return; //Wrong key interest.

	ndn::shared_ptr<const ndn::IdentityCertificate> cert = getCertificate(certName);

	if (!static_cast<bool>(cert))
	return; // cert is not found

	ndn::shared_ptr<ndn::Data> data = ndn::make_shared<ndn::Data>();
	data->setName(interestName);
	data->setContent(cert->wireEncode());
	m_keyChain.signWithSha256(*data);

	m_nlsrFace.put(*data);
	}

	void
	Nlsr::onKeyPrefixRegSuccess(const ndn::Name& name)
	{
	}

	void
	Nlsr::onDestroyFaceSuccess(const ndn::nfd::ControlParameters& commandSuccessResult)
	{
	}

	void
	Nlsr::onDestroyFaceFailure(int32_t code, const std::string& error)
	{
	std::cerr << error << " (code: " << code << ")";
	throw Error("Error: Face destruction failed");
	}

	void
	Nlsr::destroyFaces()
	{
	std::list<Adjacent>& adjacents = m_adjacencyList.getAdjList();
	for (std::list<Adjacent>::iterator it = adjacents.begin();
	it != adjacents.end(); it++) {
	m_fib.destroyFace((*it).getConnectingFaceUri(),
	ndn::bind(&Nlsr::onDestroyFaceSuccess, this, _1),
	ndn::bind(&Nlsr::onDestroyFaceFailure, this, _1, _2));
	}
	}




	void
	Nlsr::onFaceEventNotification(const ndn::nfd::FaceEventNotification& faceEventNotification)
	{
	_LOG_TRACE("Nlsr::onFaceEventNotification called");
	ndn::nfd::FaceEventKind kind = faceEventNotification.getKind();

	if (kind == ndn::nfd::FACE_EVENT_DESTROYED) {
	uint64_t faceId = faceEventNotification.getFaceId();

	Adjacent* adjacent = m_adjacencyList.findAdjacent(faceId);

	if (adjacent != nullptr) {
	_LOG_DEBUG("Face to " << adjacent->getName() << " with face id: " << faceId << " destroyed");

	adjacent->setFaceId(0);

	// Only trigger an Adjacency LSA build if this node is changing from ACTIVE to INACTIVE
	// since this rebuild will effectively cancel the previous Adjacency LSA refresh event
	// and schedule a new one further in the future.
	//
	// Continuously scheduling the refresh in the future will block the router from refreshing
	// its Adjacency LSA. Since other routers' Name prefixes' expiration times are updated
	// when this router refreshes its Adjacency LSA, the other routers' prefixes will expire
	// and be removed from the RIB.
	//
	// This check is required to fix Bug #2733 for now. This check would be unnecessary
	// to fix Bug #2733 when Issue #2732 is completed, but the check also helps with
	// optimization so it can remain even when Issue #2732 is implemented.
	if (adjacent->getStatus() == Adjacent::STATUS_ACTIVE) {
	adjacent->setStatus(Adjacent::STATUS_INACTIVE);

	// A new adjacency LSA cannot be built until the neighbor is marked INACTIVE and
	// has met the HELLO retry threshold
	adjacent->setInterestTimedOutNo(m_confParam.getInterestRetryNumber());

	m_nlsrLsdb.scheduleAdjLsaBuild();
	}
	}
	}
	}


	void
	Nlsr::startEventLoop()
	{
	m_nlsrFace.processEvents();
	}

	void
	Nlsr::usage(const string& progname)
	{
	std::cout << "Usage: " << progname << " [OPTIONS...]" << std::endl;
	std::cout << " NDN routing...." << std::endl;
	std::cout << " -d Run in daemon mode" << std::endl;
	std::cout << " -f <FILE> Specify configuration file name" << std::endl;
	std::cout << " -V Display version information" << std::endl;
	std::cout << " -h Display this help message" << std::endl;
	}


	} // namespace nlsr