ndn-cpp/node.cpp - ndn-cxx - Gitiles

 /**
  * Copyright (C) 2013 Regents of the University of California.
  * @author: Jeff Thompson <jefft0@remap.ucla.edu>
  * See COPYING for copyright and distribution information.
  */

 #include <sys/time.h>
 #include <stdexcept>
 #include "c/util/crypto.h"
 #include "encoding/binary-xml-decoder.hpp"
 #include "c/encoding/binary-xml.h"
 #include "forwarding-entry.hpp"
 #include "security/key-chain.hpp"
 #include "sha256-with-rsa-signature.hpp"
 #include "node.hpp"

 using namespace std;
 using namespace ndn::ptr_lib;

 namespace ndn {

 static uint8_t SELFREG_PUBLIC_KEY_DER[] = {
 0x30, 0x81, 0x9F, 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x81,
 0x8D, 0x00, 0x30, 0x81, 0x89, 0x02, 0x81, 0x81, 0x00, 0xE1, 0x7D, 0x30, 0xA7, 0xD8, 0x28, 0xAB, 0x1B, 0x84, 0x0B, 0x17,
 0x54, 0x2D, 0xCA, 0xF6, 0x20, 0x7A, 0xFD, 0x22, 0x1E, 0x08, 0x6B, 0x2A, 0x60, 0xD1, 0x6C, 0xB7, 0xF5, 0x44, 0x48, 0xBA,
 0x9F, 0x3F, 0x08, 0xBC, 0xD0, 0x99, 0xDB, 0x21, 0xDD, 0x16, 0x2A, 0x77, 0x9E, 0x61, 0xAA, 0x89, 0xEE, 0xE5, 0x54, 0xD3,
 0xA4, 0x7D, 0xE2, 0x30, 0xBC, 0x7A, 0xC5, 0x90, 0xD5, 0x24, 0x06, 0x7C, 0x38, 0x98, 0xBB, 0xA6, 0xF5, 0xDC, 0x43, 0x60,
 0xB8, 0x45, 0xED, 0xA4, 0x8C, 0xBD, 0x9C, 0xF1, 0x26, 0xA7, 0x23, 0x44, 0x5F, 0x0E, 0x19, 0x52, 0xD7, 0x32, 0x5A, 0x75,
 0xFA, 0xF5, 0x56, 0x14, 0x4F, 0x9A, 0x98, 0xAF, 0x71, 0x86, 0xB0, 0x27, 0x86, 0x85, 0xB8, 0xE2, 0xC0, 0x8B, 0xEA, 0x87,
 0x17, 0x1B, 0x4D, 0xEE, 0x58, 0x5C, 0x18, 0x28, 0x29, 0x5B, 0x53, 0x95, 0xEB, 0x4A, 0x17, 0x77, 0x9F, 0x02, 0x03, 0x01,
 0x00, 01
 };

 static uint8_t SELFREG_PRIVATE_KEY_DER[] = {
 0x30, 0x82, 0x02, 0x5d, 0x02, 0x01, 0x00, 0x02, 0x81, 0x81, 0x00, 0xe1, 0x7d, 0x30, 0xa7, 0xd8, 0x28, 0xab, 0x1b, 0x84,
 0x0b, 0x17, 0x54, 0x2d, 0xca, 0xf6, 0x20, 0x7a, 0xfd, 0x22, 0x1e, 0x08, 0x6b, 0x2a, 0x60, 0xd1, 0x6c, 0xb7, 0xf5, 0x44,
 0x48, 0xba, 0x9f, 0x3f, 0x08, 0xbc, 0xd0, 0x99, 0xdb, 0x21, 0xdd, 0x16, 0x2a, 0x77, 0x9e, 0x61, 0xaa, 0x89, 0xee, 0xe5,
 0x54, 0xd3, 0xa4, 0x7d, 0xe2, 0x30, 0xbc, 0x7a, 0xc5, 0x90, 0xd5, 0x24, 0x06, 0x7c, 0x38, 0x98, 0xbb, 0xa6, 0xf5, 0xdc,
 0x43, 0x60, 0xb8, 0x45, 0xed, 0xa4, 0x8c, 0xbd, 0x9c, 0xf1, 0x26, 0xa7, 0x23, 0x44, 0x5f, 0x0e, 0x19, 0x52, 0xd7, 0x32,
 0x5a, 0x75, 0xfa, 0xf5, 0x56, 0x14, 0x4f, 0x9a, 0x98, 0xaf, 0x71, 0x86, 0xb0, 0x27, 0x86, 0x85, 0xb8, 0xe2, 0xc0, 0x8b,
 0xea, 0x87, 0x17, 0x1b, 0x4d, 0xee, 0x58, 0x5c, 0x18, 0x28, 0x29, 0x5b, 0x53, 0x95, 0xeb, 0x4a, 0x17, 0x77, 0x9f, 0x02,
 0x03, 0x01, 0x00, 0x01, 0x02, 0x81, 0x80, 0x1a, 0x4b, 0xfa, 0x4f, 0xa8, 0xc2, 0xdd, 0x69, 0xa1, 0x15, 0x96, 0x0b, 0xe8,
 0x27, 0x42, 0x5a, 0xf9, 0x5c, 0xea, 0x0c, 0xac, 0x98, 0xaa, 0xe1, 0x8d, 0xaa, 0xeb, 0x2d, 0x3c, 0x60, 0x6a, 0xfb, 0x45,
 0x63, 0xa4, 0x79, 0x83, 0x67, 0xed, 0xe4, 0x15, 0xc0, 0xb0, 0x20, 0x95, 0x6d, 0x49, 0x16, 0xc6, 0x42, 0x05, 0x48, 0xaa,
 0xb1, 0xa5, 0x53, 0x65, 0xd2, 0x02, 0x99, 0x08, 0xd1, 0x84, 0xcc, 0xf0, 0xcd, 0xea, 0x61, 0xc9, 0x39, 0x02, 0x3f, 0x87,
 0x4a, 0xe5, 0xc4, 0xd2, 0x07, 0x02, 0xe1, 0x9f, 0xa0, 0x06, 0xc2, 0xcc, 0x02, 0xe7, 0xaa, 0x6c, 0x99, 0x8a, 0xf8, 0x49,
 0x00, 0xf1, 0xa2, 0x8c, 0x0c, 0x8a, 0xb9, 0x4f, 0x6d, 0x73, 0x3b, 0x2c, 0xb7, 0x9f, 0x8a, 0xa6, 0x7f, 0x9b, 0x9f, 0xb7,
 0xa1, 0xcc, 0x74, 0x2e, 0x8f, 0xb8, 0xb0, 0x26, 0x89, 0xd2, 0xe5, 0x66, 0xe8, 0x8e, 0xa1, 0x02, 0x41, 0x00, 0xfc, 0xe7,
 0x52, 0xbc, 0x4e, 0x95, 0xb6, 0x1a, 0xb4, 0x62, 0xcc, 0xd8, 0x06, 0xe1, 0xdc, 0x7a, 0xa2, 0xb6, 0x71, 0x01, 0xaa, 0x27,
 0xfc, 0x99, 0xe5, 0xf2, 0x54, 0xbb, 0xb2, 0x85, 0xe1, 0x96, 0x54, 0x2d, 0xcb, 0xba, 0x86, 0xfa, 0x80, 0xdf, 0xcf, 0x39,
 0xe6, 0x74, 0xcb, 0x22, 0xce, 0x70, 0xaa, 0x10, 0x00, 0x73, 0x1d, 0x45, 0x0a, 0x39, 0x51, 0x84, 0xf5, 0x15, 0x8f, 0x37,
 0x76, 0x91, 0x02, 0x41, 0x00, 0xe4, 0x3f, 0xf0, 0xf4, 0xde, 0x79, 0x77, 0x48, 0x9b, 0x9c, 0x28, 0x45, 0x26, 0x57, 0x3c,
 0x71, 0x40, 0x28, 0x6a, 0xa1, 0xfe, 0xc3, 0xe5, 0x37, 0xa1, 0x03, 0xf6, 0x2d, 0xbe, 0x80, 0x64, 0x72, 0x69, 0x2e, 0x9b,
 0x4d, 0xe3, 0x2e, 0x1b, 0xfe, 0xe7, 0xf9, 0x77, 0x8c, 0x18, 0x53, 0x9f, 0xe2, 0xfe, 0x00, 0xbb, 0x49, 0x20, 0x47, 0xdf,
 0x01, 0x61, 0x87, 0xd6, 0xe3, 0x44, 0xb5, 0x03, 0x2f, 0x02, 0x40, 0x54, 0xec, 0x7c, 0xbc, 0xdd, 0x0a, 0xaa, 0xde, 0xe6,
 0xc9, 0xf2, 0x8d, 0x6c, 0x2a, 0x35, 0xf6, 0x3c, 0x63, 0x55, 0x29, 0x40, 0xf1, 0x32, 0x82, 0x9f, 0x53, 0xb3, 0x9e, 0x5f,
 0xc1, 0x53, 0x52, 0x3e, 0xac, 0x2e, 0x28, 0x51, 0xa1, 0x16, 0xdb, 0x90, 0xe3, 0x99, 0x7e, 0x88, 0xa4, 0x04, 0x7c, 0x92,
 0xae, 0xd2, 0xe7, 0xd4, 0xe1, 0x55, 0x20, 0x90, 0x3e, 0x3c, 0x6a, 0x63, 0xf0, 0x34, 0xf1, 0x02, 0x41, 0x00, 0x84, 0x5a,
 0x17, 0x6c, 0xc6, 0x3c, 0x84, 0xd0, 0x93, 0x7a, 0xff, 0x56, 0xe9, 0x9e, 0x98, 0x2b, 0xcb, 0x5a, 0x24, 0x4a, 0xff, 0x21,
 0xb4, 0x9e, 0x87, 0x3d, 0x76, 0xd8, 0x9b, 0xa8, 0x73, 0x96, 0x6c, 0x2b, 0x5c, 0x5e, 0xd3, 0xa6, 0xff, 0x10, 0xd6, 0x8e,
 0xaf, 0xa5, 0x8a, 0xcd, 0xa2, 0xde, 0xcb, 0x0e, 0xbd, 0x8a, 0xef, 0xae, 0xfd, 0x3f, 0x1d, 0xc0, 0xd8, 0xf8, 0x3b, 0xf5,
 0x02, 0x7d, 0x02, 0x41, 0x00, 0x8b, 0x26, 0xd3, 0x2c, 0x7d, 0x28, 0x38, 0x92, 0xf1, 0xbf, 0x15, 0x16, 0x39, 0x50, 0xc8,
 0x6d, 0x32, 0xec, 0x28, 0xf2, 0x8b, 0xd8, 0x70, 0xc5, 0xed, 0xe1, 0x7b, 0xff, 0x2d, 0x66, 0x8c, 0x86, 0x77, 0x43, 0xeb,
 0xb6, 0xf6, 0x50, 0x66, 0xb0, 0x40, 0x24, 0x6a, 0xaf, 0x98, 0x21, 0x45, 0x30, 0x01, 0x59, 0xd0, 0xc3, 0xfc, 0x7b, 0xae,
 0x30, 0x18, 0xeb, 0x90, 0xfb, 0x17, 0xd3, 0xce, 0xb5
 };

 /**
  * Set the KeyLocator using the full SELFREG_PUBLIC_KEY_DER, sign the data packet using SELFREG_PRIVATE_KEY_DER
  * and set the signature.
  * This is a temporary function, because we expect in the future that registerPrefix will not require a signature on the packet.
  * @param data The Data packet to sign.
  * @param wireFormat The WireFormat for encoding the Data packet.
  */
 static void
 selfregSign(Data& data, WireFormat& wireFormat)
 {
   data.setSignature(Sha256WithRsaSignature());
   Sha256WithRsaSignature *signature = dynamic_cast<Sha256WithRsaSignature*>(data.getSignature());

   // Set the public key.
   uint8_t publicKeyDigest[SHA256_DIGEST_LENGTH];
   ndn_digestSha256(SELFREG_PUBLIC_KEY_DER, sizeof(SELFREG_PUBLIC_KEY_DER), publicKeyDigest);
   signature->getPublisherPublicKeyDigest().setPublisherPublicKeyDigest(publicKeyDigest, sizeof(publicKeyDigest));
   signature->getKeyLocator().setType(ndn_KeyLocatorType_KEY);
   signature->getKeyLocator().setKeyData(SELFREG_PUBLIC_KEY_DER, sizeof(SELFREG_PUBLIC_KEY_DER));

   // Sign the fields.
   SignedBlob encoding = data.wireEncode(wireFormat);
   uint8_t signedPortionDigest[SHA256_DIGEST_LENGTH];
   ndn_digestSha256(encoding.signedBuf(), encoding.signedSize(), signedPortionDigest);
   uint8_t signatureBits[1000];
   unsigned int signatureBitsLength;
   // Use a temporary pointer since d2i updates it.
   const uint8_t *derPointer = SELFREG_PRIVATE_KEY_DER;
   RSA *privateKey = d2i_RSAPrivateKey(NULL, &derPointer, sizeof(SELFREG_PRIVATE_KEY_DER));
   if (!privateKey)
     throw std::runtime_error("Error decoding private key in d2i_RSAPrivateKey");
   int success = RSA_sign(NID_sha256, signedPortionDigest, sizeof(signedPortionDigest), signatureBits, &signatureBitsLength, privateKey);
   // Free the private key before checking for success.
   RSA_free(privateKey);
   if (!success)
     throw std::runtime_error("Error in RSA_sign");

   signature->setSignature(signatureBits, (size_t)signatureBitsLength);
 }

 // Use gettimeofday to return the current time in milliseconds.
 static inline double
 getNowMilliseconds()
 {
   timeval t;
   gettimeofday(&t, NULL);
   return t.tv_sec * 1000.0 + t.tv_usec / 1000.0;
 }

 Node::Node(const shared_ptr<Transport>& transport, const shared_ptr<const Transport::ConnectionInfo>& connectionInfo)
 : transport_(transport), connectionInfo_(connectionInfo),
   ndndIdFetcherInterest_(Name("/%C1.M.S.localhost/%C1.M.SRV/ndnd/KEY"), 4000.0)
 {
 }

 void
 Node::expressInterest(const Interest& interest, const OnData& onData, const OnTimeout& onTimeout)
 {
   // TODO: Properly check if we are already connected to the expected host.
   if (!transport_->getIsConnected())
     transport_->connect(*connectionInfo_, *this);

   pit_.push_back(shared_ptr<PitEntry>(new PitEntry(shared_ptr<const Interest>(new Interest(interest)), onData, onTimeout)));

   Blob encoding = interest.wireEncode();
   transport_->send(*encoding);
 }

 void
 Node::registerPrefix
   (const Name& prefix, const OnInterest& onInterest, const OnRegisterFailed& onRegisterFailed, const ForwardingFlags& flags, WireFormat& wireFormat)
 {
   if (ndndId_.size() == 0) {
     // First fetch the ndndId of the connected hub.
     NdndIdFetcher fetcher
       (shared_ptr<NdndIdFetcher::Info>(new NdndIdFetcher::Info
         (this, prefix, onInterest, onRegisterFailed, flags, wireFormat)));
     // It is OK for func_lib::function make a copy of the function object because the Info is in a shared_ptr.
     expressInterest(ndndIdFetcherInterest_, fetcher, fetcher);
   }
   else
     registerPrefixHelper(make_shared<const Name>(prefix), onInterest, onRegisterFailed, flags, wireFormat);
 }

 void
 Node::NdndIdFetcher::operator()(const shared_ptr<const Interest>& interest, const shared_ptr<Data>& ndndIdData)
 {
   Sha256WithRsaSignature *signature = dynamic_cast<Sha256WithRsaSignature*>(ndndIdData->getSignature());
   if (signature && signature->getPublisherPublicKeyDigest().getPublisherPublicKeyDigest().size() > 0) {
     // Set the ndndId_ and continue.
     // TODO: If there are multiple connected hubs, the NDN ID is really stored per connected hub.
     info_->node_.ndndId_ = signature->getPublisherPublicKeyDigest().getPublisherPublicKeyDigest();
     info_->node_.registerPrefixHelper
       (info_->prefix_, info_->onInterest_, info_->onRegisterFailed_, info_->flags_, info_->wireFormat_);
   }
   else
     info_->onRegisterFailed_(info_->prefix_);
 }

 void
 Node::NdndIdFetcher::operator()(const shared_ptr<const Interest>& timedOutInterest)
 {
   info_->onRegisterFailed_(info_->prefix_);
 }

 void
 Node::registerPrefixHelper
   (const shared_ptr<const Name>& prefix, const OnInterest& onInterest, const OnRegisterFailed& onRegisterFailed,
    const ForwardingFlags& flags, WireFormat& wireFormat)
 {
   // Create a ForwardingEntry.
   ForwardingEntry forwardingEntry("selfreg", *prefix, PublisherPublicKeyDigest(), -1, flags, 2147483647);
   Blob content = forwardingEntry.wireEncode();

   // Set the ForwardingEntry as the content of a Data packet and sign.
   Data data;
   data.setContent(content);
   data.getMetaInfo().setTimestampMilliseconds(time(NULL) * 1000.0);
   // For now, self sign with an arbirary key.  In the future, we may not require a signature to register.
   selfregSign(data, wireFormat);
   Blob encodedData = data.wireEncode();

   // Create an interest where the name has the encoded Data packet.
   Name interestName;
   const uint8_t component0[] = "ndnx";
   const uint8_t component2[] = "selfreg";
   interestName.addComponent(component0, sizeof(component0) - 1);
   interestName.addComponent(ndndId_);
   interestName.addComponent(component2, sizeof(component2) - 1);
   interestName.addComponent(encodedData);

   Interest interest(interestName);
   interest.setScope(1);
   Blob encodedInterest = interest.wireEncode();

   // Save the onInterest callback and send the registration interest.
   registeredPrefixTable_.push_back(shared_ptr<PrefixEntry>(new PrefixEntry(prefix, onInterest)));

   transport_->send(*encodedInterest);
 }

 void
 Node::processEvents()
 {
   transport_->processEvents();

   // Check for PIT entry timeouts.  Go backwards through the list so we can erase entries.
   double nowMilliseconds = getNowMilliseconds();
   for (int i = (int)pit_.size() - 1; i >= 0; --i) {
     if (pit_[i]->checkTimeout(this, nowMilliseconds)) {
       pit_.erase(pit_.begin() + i);

       // Refresh now since the timeout callback might have delayed.
       nowMilliseconds = getNowMilliseconds();
     }
   }
 }

 void
 Node::onReceivedElement(const uint8_t *element, size_t elementLength)
 {
   BinaryXmlDecoder decoder(element, elementLength);

   if (decoder.peekDTag(ndn_BinaryXml_DTag_Interest)) {
     shared_ptr<Interest> interest(new Interest());
     interest->wireDecode(element, elementLength);

     PrefixEntry *entry = getEntryForRegisteredPrefix(interest->getName());
     if (entry)
       entry->getOnInterest()(entry->getPrefix(), interest, *transport_);
   }
   else if (decoder.peekDTag(ndn_BinaryXml_DTag_ContentObject)) {
     shared_ptr<Data> data(new Data());
     data->wireDecode(element, elementLength);

     int iPitEntry = getEntryIndexForExpressedInterest(data->getName());
     if (iPitEntry >= 0) {
       // Copy pointers to the needed objects and remove the PIT entry before the calling the callback.
       const OnData onData = pit_[iPitEntry]->getOnData();
       const shared_ptr<const Interest> interest = pit_[iPitEntry]->getInterest();
       pit_.erase(pit_.begin() + iPitEntry);
       onData(interest, data);
     }
   }
 }

 void
 Node::shutdown()
 {
   transport_->close();
 }

 int
 Node::getEntryIndexForExpressedInterest(const Name& name)
 {
   // TODO: Doesn't this belong in the Name class?
   vector<struct ndn_NameComponent> nameComponents;
   nameComponents.reserve(name.getComponentCount());
   struct ndn_Name nameStruct;
   ndn_Name_initialize(&nameStruct, &nameComponents[0], nameComponents.capacity());
   name.get(nameStruct);

   int iResult = -1;

 	for (size_t i = 0; i < pit_.size(); ++i) {
 		if (ndn_Interest_matchesName((struct ndn_Interest *)&pit_[i]->getInterestStruct(), &nameStruct)) {
       if (iResult < 0 ||
           pit_[i]->getInterestStruct().name.nComponents > pit_[iResult]->getInterestStruct().name.nComponents)
         // Update to the longer match.
         iResult = i;
     }
 	}

 	return iResult;
 }

 Node::PrefixEntry*
 Node::getEntryForRegisteredPrefix(const Name& name)
 {
   int iResult = -1;

 	for (size_t i = 0; i < registeredPrefixTable_.size(); ++i) {
 		if (registeredPrefixTable_[i]->getPrefix()->match(name)) {
       if (iResult < 0 ||
           registeredPrefixTable_[i]->getPrefix()->getComponentCount() > registeredPrefixTable_[iResult]->getPrefix()->getComponentCount())
         // Update to the longer match.
         iResult = i;
     }
 	}

   if (iResult >= 0)
   	return registeredPrefixTable_[iResult].get();
   else
     return 0;
 }

 Node::PitEntry::PitEntry(const shared_ptr<const Interest>& interest, const OnData& onData, const OnTimeout& onTimeout)
 : interest_(interest), onData_(onData), onTimeout_(onTimeout)
 {
   // Set up timeoutTime_.
   if (interest_->getInterestLifetimeMilliseconds() >= 0.0)
     timeoutTimeMilliseconds_ = getNowMilliseconds() + interest_->getInterestLifetimeMilliseconds();
   else
     // No timeout.
     timeoutTimeMilliseconds_ = -1.0;

   // Set up interestStruct_.
   // TODO: Doesn't this belong in the Interest class?
   nameComponents_.reserve(interest_->getName().getComponentCount());
   excludeEntries_.reserve(interest_->getExclude().getEntryCount());
   ndn_Interest_initialize
     (&interestStruct_, &nameComponents_[0], nameComponents_.capacity(), &excludeEntries_[0], excludeEntries_.capacity());
   interest_->get(interestStruct_);
 }

 bool
 Node::PitEntry::checkTimeout(Node *parent, double nowMilliseconds)
 {
   if (timeoutTimeMilliseconds_ >= 0.0 && nowMilliseconds >= timeoutTimeMilliseconds_) {
     if (onTimeout_) {
       // Ignore all exceptions.
       try {
         onTimeout_(interest_);
       }
       catch (...) { }
     }

     return true;
   }
   else
     return false;
 }

 }
	/**
	* Copyright (C) 2013 Regents of the University of California.
	* @author: Jeff Thompson <jefft0@remap.ucla.edu>
	* See COPYING for copyright and distribution information.
	*/

	#include <sys/time.h>
	#include <stdexcept>
	#include "c/util/crypto.h"
	#include "encoding/binary-xml-decoder.hpp"
	#include "c/encoding/binary-xml.h"
	#include "forwarding-entry.hpp"
	#include "security/key-chain.hpp"
	#include "sha256-with-rsa-signature.hpp"
	#include "node.hpp"

	using namespace std;
	using namespace ndn::ptr_lib;

	namespace ndn {

	static uint8_t SELFREG_PUBLIC_KEY_DER[] = {
	0x30, 0x81, 0x9F, 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x81,
	0x8D, 0x00, 0x30, 0x81, 0x89, 0x02, 0x81, 0x81, 0x00, 0xE1, 0x7D, 0x30, 0xA7, 0xD8, 0x28, 0xAB, 0x1B, 0x84, 0x0B, 0x17,
	0x54, 0x2D, 0xCA, 0xF6, 0x20, 0x7A, 0xFD, 0x22, 0x1E, 0x08, 0x6B, 0x2A, 0x60, 0xD1, 0x6C, 0xB7, 0xF5, 0x44, 0x48, 0xBA,
	0x9F, 0x3F, 0x08, 0xBC, 0xD0, 0x99, 0xDB, 0x21, 0xDD, 0x16, 0x2A, 0x77, 0x9E, 0x61, 0xAA, 0x89, 0xEE, 0xE5, 0x54, 0xD3,
	0xA4, 0x7D, 0xE2, 0x30, 0xBC, 0x7A, 0xC5, 0x90, 0xD5, 0x24, 0x06, 0x7C, 0x38, 0x98, 0xBB, 0xA6, 0xF5, 0xDC, 0x43, 0x60,
	0xB8, 0x45, 0xED, 0xA4, 0x8C, 0xBD, 0x9C, 0xF1, 0x26, 0xA7, 0x23, 0x44, 0x5F, 0x0E, 0x19, 0x52, 0xD7, 0x32, 0x5A, 0x75,
	0xFA, 0xF5, 0x56, 0x14, 0x4F, 0x9A, 0x98, 0xAF, 0x71, 0x86, 0xB0, 0x27, 0x86, 0x85, 0xB8, 0xE2, 0xC0, 0x8B, 0xEA, 0x87,
	0x17, 0x1B, 0x4D, 0xEE, 0x58, 0x5C, 0x18, 0x28, 0x29, 0x5B, 0x53, 0x95, 0xEB, 0x4A, 0x17, 0x77, 0x9F, 0x02, 0x03, 0x01,
	0x00, 01
	};

	static uint8_t SELFREG_PRIVATE_KEY_DER[] = {
	0x30, 0x82, 0x02, 0x5d, 0x02, 0x01, 0x00, 0x02, 0x81, 0x81, 0x00, 0xe1, 0x7d, 0x30, 0xa7, 0xd8, 0x28, 0xab, 0x1b, 0x84,
	0x0b, 0x17, 0x54, 0x2d, 0xca, 0xf6, 0x20, 0x7a, 0xfd, 0x22, 0x1e, 0x08, 0x6b, 0x2a, 0x60, 0xd1, 0x6c, 0xb7, 0xf5, 0x44,
	0x48, 0xba, 0x9f, 0x3f, 0x08, 0xbc, 0xd0, 0x99, 0xdb, 0x21, 0xdd, 0x16, 0x2a, 0x77, 0x9e, 0x61, 0xaa, 0x89, 0xee, 0xe5,
	0x54, 0xd3, 0xa4, 0x7d, 0xe2, 0x30, 0xbc, 0x7a, 0xc5, 0x90, 0xd5, 0x24, 0x06, 0x7c, 0x38, 0x98, 0xbb, 0xa6, 0xf5, 0xdc,
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	};

	/**
	* Set the KeyLocator using the full SELFREG_PUBLIC_KEY_DER, sign the data packet using SELFREG_PRIVATE_KEY_DER
	* and set the signature.
	* This is a temporary function, because we expect in the future that registerPrefix will not require a signature on the packet.
	* @param data The Data packet to sign.
	* @param wireFormat The WireFormat for encoding the Data packet.
	*/
	static void
	selfregSign(Data& data, WireFormat& wireFormat)
	{
	data.setSignature(Sha256WithRsaSignature());
	Sha256WithRsaSignature signature = dynamic_cast<Sha256WithRsaSignature>(data.getSignature());

	// Set the public key.
	uint8_t publicKeyDigest[SHA256_DIGEST_LENGTH];
	ndn_digestSha256(SELFREG_PUBLIC_KEY_DER, sizeof(SELFREG_PUBLIC_KEY_DER), publicKeyDigest);
	signature->getPublisherPublicKeyDigest().setPublisherPublicKeyDigest(publicKeyDigest, sizeof(publicKeyDigest));
	signature->getKeyLocator().setType(ndn_KeyLocatorType_KEY);
	signature->getKeyLocator().setKeyData(SELFREG_PUBLIC_KEY_DER, sizeof(SELFREG_PUBLIC_KEY_DER));

	// Sign the fields.
	SignedBlob encoding = data.wireEncode(wireFormat);
	uint8_t signedPortionDigest[SHA256_DIGEST_LENGTH];
	ndn_digestSha256(encoding.signedBuf(), encoding.signedSize(), signedPortionDigest);
	uint8_t signatureBits[1000];
	unsigned int signatureBitsLength;
	// Use a temporary pointer since d2i updates it.
	const uint8_t *derPointer = SELFREG_PRIVATE_KEY_DER;
	RSA *privateKey = d2i_RSAPrivateKey(NULL, &derPointer, sizeof(SELFREG_PRIVATE_KEY_DER));
	if (!privateKey)
	throw std::runtime_error("Error decoding private key in d2i_RSAPrivateKey");
	int success = RSA_sign(NID_sha256, signedPortionDigest, sizeof(signedPortionDigest), signatureBits, &signatureBitsLength, privateKey);
	// Free the private key before checking for success.
	RSA_free(privateKey);
	if (!success)
	throw std::runtime_error("Error in RSA_sign");

	signature->setSignature(signatureBits, (size_t)signatureBitsLength);
	}

	// Use gettimeofday to return the current time in milliseconds.
	static inline double
	getNowMilliseconds()
	{
	timeval t;
	gettimeofday(&t, NULL);
	return t.tv_sec * 1000.0 + t.tv_usec / 1000.0;
	}

	Node::Node(const shared_ptr<Transport>& transport, const shared_ptr<const Transport::ConnectionInfo>& connectionInfo)
	: transport_(transport), connectionInfo_(connectionInfo),
	ndndIdFetcherInterest_(Name("/%C1.M.S.localhost/%C1.M.SRV/ndnd/KEY"), 4000.0)
	{
	}

	void
	Node::expressInterest(const Interest& interest, const OnData& onData, const OnTimeout& onTimeout)
	{
	// TODO: Properly check if we are already connected to the expected host.
	if (!transport_->getIsConnected())
	transport_->connect(connectionInfo_, this);

	pit_.push_back(shared_ptr<PitEntry>(new PitEntry(shared_ptr<const Interest>(new Interest(interest)), onData, onTimeout)));

	Blob encoding = interest.wireEncode();
	transport_->send(*encoding);
	}

	void
	Node::registerPrefix
	(const Name& prefix, const OnInterest& onInterest, const OnRegisterFailed& onRegisterFailed, const ForwardingFlags& flags, WireFormat& wireFormat)
	{
	if (ndndId_.size() == 0) {
	// First fetch the ndndId of the connected hub.
	NdndIdFetcher fetcher
	(shared_ptr<NdndIdFetcher::Info>(new NdndIdFetcher::Info
	(this, prefix, onInterest, onRegisterFailed, flags, wireFormat)));
	// It is OK for func_lib::function make a copy of the function object because the Info is in a shared_ptr.
	expressInterest(ndndIdFetcherInterest_, fetcher, fetcher);
	}
	else
	registerPrefixHelper(make_shared<const Name>(prefix), onInterest, onRegisterFailed, flags, wireFormat);
	}

	void
	Node::NdndIdFetcher::operator()(const shared_ptr<const Interest>& interest, const shared_ptr<Data>& ndndIdData)
	{
	Sha256WithRsaSignature signature = dynamic_cast<Sha256WithRsaSignature>(ndndIdData->getSignature());
	if (signature && signature->getPublisherPublicKeyDigest().getPublisherPublicKeyDigest().size() > 0) {
	// Set the ndndId_ and continue.
	// TODO: If there are multiple connected hubs, the NDN ID is really stored per connected hub.
	info_->node_.ndndId_ = signature->getPublisherPublicKeyDigest().getPublisherPublicKeyDigest();
	info_->node_.registerPrefixHelper
	(info_->prefix_, info_->onInterest_, info_->onRegisterFailed_, info_->flags_, info_->wireFormat_);
	}
	else
	info_->onRegisterFailed_(info_->prefix_);
	}

	void
	Node::NdndIdFetcher::operator()(const shared_ptr<const Interest>& timedOutInterest)
	{
	info_->onRegisterFailed_(info_->prefix_);
	}

	void
	Node::registerPrefixHelper
	(const shared_ptr<const Name>& prefix, const OnInterest& onInterest, const OnRegisterFailed& onRegisterFailed,
	const ForwardingFlags& flags, WireFormat& wireFormat)
	{
	// Create a ForwardingEntry.
	ForwardingEntry forwardingEntry("selfreg", *prefix, PublisherPublicKeyDigest(), -1, flags, 2147483647);
	Blob content = forwardingEntry.wireEncode();

	// Set the ForwardingEntry as the content of a Data packet and sign.
	Data data;
	data.setContent(content);
	data.getMetaInfo().setTimestampMilliseconds(time(NULL) * 1000.0);
	// For now, self sign with an arbirary key. In the future, we may not require a signature to register.
	selfregSign(data, wireFormat);
	Blob encodedData = data.wireEncode();

	// Create an interest where the name has the encoded Data packet.
	Name interestName;
	const uint8_t component0[] = "ndnx";
	const uint8_t component2[] = "selfreg";
	interestName.addComponent(component0, sizeof(component0) - 1);
	interestName.addComponent(ndndId_);
	interestName.addComponent(component2, sizeof(component2) - 1);
	interestName.addComponent(encodedData);

	Interest interest(interestName);
	interest.setScope(1);
	Blob encodedInterest = interest.wireEncode();

	// Save the onInterest callback and send the registration interest.
	registeredPrefixTable_.push_back(shared_ptr<PrefixEntry>(new PrefixEntry(prefix, onInterest)));

	transport_->send(*encodedInterest);
	}

	void
	Node::processEvents()
	{
	transport_->processEvents();

	// Check for PIT entry timeouts. Go backwards through the list so we can erase entries.
	double nowMilliseconds = getNowMilliseconds();
	for (int i = (int)pit_.size() - 1; i >= 0; --i) {
	if (pit_[i]->checkTimeout(this, nowMilliseconds)) {
	pit_.erase(pit_.begin() + i);

	// Refresh now since the timeout callback might have delayed.
	nowMilliseconds = getNowMilliseconds();
	}
	}
	}

	void
	Node::onReceivedElement(const uint8_t *element, size_t elementLength)
	{
	BinaryXmlDecoder decoder(element, elementLength);

	if (decoder.peekDTag(ndn_BinaryXml_DTag_Interest)) {
	shared_ptr<Interest> interest(new Interest());
	interest->wireDecode(element, elementLength);

	PrefixEntry *entry = getEntryForRegisteredPrefix(interest->getName());
	if (entry)
	entry->getOnInterest()(entry->getPrefix(), interest, *transport_);
	}
	else if (decoder.peekDTag(ndn_BinaryXml_DTag_ContentObject)) {
	shared_ptr<Data> data(new Data());
	data->wireDecode(element, elementLength);

	int iPitEntry = getEntryIndexForExpressedInterest(data->getName());
	if (iPitEntry >= 0) {
	// Copy pointers to the needed objects and remove the PIT entry before the calling the callback.
	const OnData onData = pit_[iPitEntry]->getOnData();
	const shared_ptr<const Interest> interest = pit_[iPitEntry]->getInterest();
	pit_.erase(pit_.begin() + iPitEntry);
	onData(interest, data);
	}
	}
	}

	void
	Node::shutdown()
	{
	transport_->close();
	}

	int
	Node::getEntryIndexForExpressedInterest(const Name& name)
	{
	// TODO: Doesn't this belong in the Name class?
	vector<struct ndn_NameComponent> nameComponents;
	nameComponents.reserve(name.getComponentCount());
	struct ndn_Name nameStruct;
	ndn_Name_initialize(&nameStruct, &nameComponents[0], nameComponents.capacity());
	name.get(nameStruct);

	int iResult = -1;

	for (size_t i = 0; i < pit_.size(); ++i) {
	if (ndn_Interest_matchesName((struct ndn_Interest *)&pit_[i]->getInterestStruct(), &nameStruct)) {
	if (iResult < 0 \|\|
	pit_[i]->getInterestStruct().name.nComponents > pit_[iResult]->getInterestStruct().name.nComponents)
	// Update to the longer match.
	iResult = i;
	}
	}

	return iResult;
	}

	Node::PrefixEntry*
	Node::getEntryForRegisteredPrefix(const Name& name)
	{
	int iResult = -1;

	for (size_t i = 0; i < registeredPrefixTable_.size(); ++i) {
	if (registeredPrefixTable_[i]->getPrefix()->match(name)) {
	if (iResult < 0 \|\|
	registeredPrefixTable_[i]->getPrefix()->getComponentCount() > registeredPrefixTable_[iResult]->getPrefix()->getComponentCount())
	// Update to the longer match.
	iResult = i;
	}
	}

	if (iResult >= 0)
	return registeredPrefixTable_[iResult].get();
	else
	return 0;
	}

	Node::PitEntry::PitEntry(const shared_ptr<const Interest>& interest, const OnData& onData, const OnTimeout& onTimeout)
	: interest_(interest), onData_(onData), onTimeout_(onTimeout)
	{
	// Set up timeoutTime_.
	if (interest_->getInterestLifetimeMilliseconds() >= 0.0)
	timeoutTimeMilliseconds_ = getNowMilliseconds() + interest_->getInterestLifetimeMilliseconds();
	else
	// No timeout.
	timeoutTimeMilliseconds_ = -1.0;

	// Set up interestStruct_.
	// TODO: Doesn't this belong in the Interest class?
	nameComponents_.reserve(interest_->getName().getComponentCount());
	excludeEntries_.reserve(interest_->getExclude().getEntryCount());
	ndn_Interest_initialize
	(&interestStruct_, &nameComponents_[0], nameComponents_.capacity(), &excludeEntries_[0], excludeEntries_.capacity());
	interest_->get(interestStruct_);
	}

	bool
	Node::PitEntry::checkTimeout(Node *parent, double nowMilliseconds)
	{
	if (timeoutTimeMilliseconds_ >= 0.0 && nowMilliseconds >= timeoutTimeMilliseconds_) {
	if (onTimeout_) {
	// Ignore all exceptions.
	try {
	onTimeout_(interest_);
	}
	catch (...) { }
	}

	return true;
	}
	else
	return false;
	}

	}