void NodeHandshakeExtension::HandshakeEndpoint::query(const dtn::data::EID &origin)
{
{
ibrcommon::MutexLock l(_blacklist_lock);
// only query once each 60 seconds
if (_blacklist[origin] > dtn::utils::Clock::getUnixTimestamp()) return;
_blacklist[origin] = dtn::utils::Clock::getUnixTimestamp() + 60;
}
// create a new request for the summary vector of the neighbor
NodeHandshake request(NodeHandshake::HANDSHAKE_REQUEST);
// walk through all extensions to generate a request
(*_callback).requestHandshake(origin, request);
IBRCOMMON_LOGGER_DEBUG_TAG(NodeHandshakeExtension::TAG, 15) << "handshake query from " << origin.getString() << ": " << request.toString() << IBRCOMMON_LOGGER_ENDL;
// create a new bundle
dtn::data::Bundle req;
// set the source of the bundle
req.source = getWorkerURI();
// set the destination of the bundle
req.set(dtn::data::PrimaryBlock::DESTINATION_IS_SINGLETON, true);
if (origin.isCompressable())
req.destination = origin.add(origin.getDelimiter() + "50");
else
req.destination = origin.add(origin.getDelimiter() + "routing");
// limit the lifetime to 60 seconds
req.lifetime = 60;
// set high priority
req.set(dtn::data::PrimaryBlock::PRIORITY_BIT1, false);
req.set(dtn::data::PrimaryBlock::PRIORITY_BIT2, true);
dtn::data::PayloadBlock &p = req.push_back<PayloadBlock>();
ibrcommon::BLOB::Reference ref = p.getBLOB();
// serialize the request into the payload
{
ibrcommon::BLOB::iostream ios = ref.iostream();
(*ios) << request;
}
// add a schl block
dtn::data::ScopeControlHopLimitBlock &schl = req.push_front<dtn::data::ScopeControlHopLimitBlock>();
schl.setLimit(1);
// add an age block (to prevent expiring due to wrong clocks)
req.push_front<dtn::data::AgeBlock>();
// send the bundle
transmit(req);
}
void DeliveryPredictabilityMap::update(const dtn::data::EID &host_b, const DeliveryPredictabilityMap &dpm, const float &p_encounter_first)
{
float p_ab = 0.0f;
try {
p_ab = get(host_b);
} catch (const DeliveryPredictabilityMap::ValueNotFoundException&) {
p_ab = p_encounter_first;
}
/**
* Calculate transitive values
*/
for (predictmap::const_iterator it = dpm._predictmap.begin(); it != dpm._predictmap.end(); ++it)
{
const dtn::data::EID &host_c = it->first;
const float &p_bc = it->second;
// do not update values for the origin host
if (host_b.sameHost(host_c)) continue;
// do not process values with our own EID
if (dtn::core::BundleCore::local.sameHost(host_c)) continue;
predictmap::iterator dp_it;
if ((dp_it = _predictmap.find(host_c)) != _predictmap.end()) {
dp_it->second = std::max(dp_it->second, p_ab * p_bc * _beta);
} else {
_predictmap[host_c] = p_ab * p_bc * _beta;
}
}
}
bool ForwardingStrategy::isBackrouteValid(const DeliveryPredictabilityMap& neighbor_dpm, const dtn::data::EID& source) const
{
ibrcommon::MutexLock dpm_lock(_prophet_router->_deliveryPredictabilityMap);
// check if we know a way to the source
try {
if (_prophet_router->_deliveryPredictabilityMap.get(source.getNode()) > 0.0) return true;
} catch (const dtn::routing::DeliveryPredictabilityMap::ValueNotFoundException&) { }
// check if the peer know a way to the source
try {
if (neighbor_dpm.get(source.getNode()) > 0.0) return true;
} catch (const dtn::routing::DeliveryPredictabilityMap::ValueNotFoundException&) { }
return false;
}
bool ForwardingStrategy::neighborDPIsGreater(const DeliveryPredictabilityMap& neighbor_dpm, const dtn::data::EID& destination) const
{
const dtn::data::EID destnode = destination.getNode();
try {
float local_pv = 0.0f;
// get the local value
{
ibrcommon::MutexLock dpm_lock(_prophet_router->_deliveryPredictabilityMap);
const DeliveryPredictabilityMap& dp_map = _prophet_router->_deliveryPredictabilityMap;
local_pv = dp_map.get(destnode);
}
try {
// retrieve the value from the DeliveryPredictabilityMap of the neighbor
float foreign_pv = neighbor_dpm.get(destnode);
return (foreign_pv > local_pv);
} catch (const DeliveryPredictabilityMap::ValueNotFoundException&) {
// if the foreign router has no entry for the destination
// then compare the local value with a fictitious initial value
return (_prophet_router->_p_first_threshold > local_pv);
}
} catch (const DeliveryPredictabilityMap::ValueNotFoundException&) {
// always forward if the destination is not in our own predictability map
}
return false;
}
std::string KeyExchangeSession::getSessionKey(const dtn::data::EID &peer, unsigned int uniqueId)
{
// generate session key
std::stringstream sstm;
sstm << uniqueId << "." << peer.getString();
return sstm.str();
}
KeyExchangeSession::KeyExchangeSession(int protocol, const dtn::data::EID &peer, unsigned int uniqueId, SessionState *state)
: _protocol(protocol), _unique_id(uniqueId), _peer(peer.getNode()), _state(state), _expiration(0)
{
// generate session key
_session_key = getSessionKey(_peer, _unique_id);
// set a expiration time (10 minutes)
_expiration = dtn::utils::Clock::getMonotonicTimestamp() + 600;
}
dtn::security::SecurityKey SecurityKeyManager::get(const dtn::data::EID &ref, const dtn::security::SecurityKey::KeyType type) const throw (SecurityKey::KeyNotFoundException)
{
dtn::security::SecurityKey keydata;
keydata.reference = ref.getNode();
keydata.type = type;
keydata.file = getKeyFile(keydata.reference, type);
// load security key
load(keydata);
return keydata;
}
void dtn::dht::DHTNameService::lookup(const dtn::data::EID &eid) {
if (!dtn::core::BundleCore::local.sameHost(eid)) {
if (this->_announced) {
std::string eid_ = eid.getNode().getString();
IBRCOMMON_LOGGER_DEBUG_TAG("DHTNameService", 30) << "DHT Lookup: " << eid_
<< IBRCOMMON_LOGGER_ENDL;
ibrcommon::MutexLock l(this->_libmutex);
dtn_dht_lookup(&_context, eid_.c_str(), eid_.size());
} else {
this->cachedLookups.push_front(eid);
}
}
}
void NativeSession::removeRegistration(const dtn::data::EID &eid) throw (NativeSessionException)
{
// error checking
if (eid == dtn::data::EID())
{
throw NativeSessionException("given endpoint is not acceptable");
}
else
{
_registration.unsubscribe(eid);
}
IBRCOMMON_LOGGER_DEBUG_TAG(NativeSession::TAG, 20) << "Registration " << eid.getString() << " removed" << IBRCOMMON_LOGGER_ENDL;
}
void PayloadIntegrityBlock::sign(dtn::data::Bundle &bundle, const SecurityKey &key, const dtn::data::EID& destination)
{
PayloadIntegrityBlock& pib = bundle.push_front<PayloadIntegrityBlock>();
pib.set(REPLICATE_IN_EVERY_FRAGMENT, true);
// check if this is a fragment
if (bundle.get(dtn::data::PrimaryBlock::FRAGMENT))
{
dtn::data::PayloadBlock& plb = bundle.find<dtn::data::PayloadBlock>();
ibrcommon::BLOB::Reference blobref = plb.getBLOB();
ibrcommon::BLOB::iostream stream = blobref.iostream();
addFragmentRange(pib._ciphersuite_params, bundle.fragmentoffset, stream.size());
}
// set the source and destination address of the new block
if (!key.reference.sameHost(bundle.source)) pib.setSecuritySource( key.reference );
if (!destination.sameHost(bundle.destination)) pib.setSecurityDestination( destination );
pib.setResultSize(key);
pib.setCiphersuiteId(SecurityBlock::PIB_RSA_SHA256);
pib._ciphersuite_flags |= CONTAINS_SECURITY_RESULT;
std::string sign = calcHash(bundle, key, pib);
pib._security_result.set(SecurityBlock::integrity_signature, sign);
}
/**
* Transfer one bundle to another node.
* @param destination The EID of the other node.
* @param id The ID of the bundle to transfer. This bundle must be stored in the storage.
*/
void RoutingExtension::transferTo(const dtn::data::EID &destination, const dtn::data::MetaBundle &meta)
{
// acquire the transfer of this bundle, could throw already in transit or no resource left exception
{
// lock the list of neighbors
ibrcommon::MutexLock l((**this).getNeighborDB());
// get the neighbor entry for the next hop
NeighborDatabase::NeighborEntry &entry = (**this).getNeighborDB().get(destination, true);
// acquire the transfer, could throw already in transit or no resource left exception
entry.acquireTransfer(meta);
}
try {
// create a new bundle transfer object
dtn::net::BundleTransfer transfer(destination, meta);
// transfer the bundle to the next hop
dtn::core::BundleCore::getInstance().getConnectionManager().queue(transfer);
IBRCOMMON_LOGGER_DEBUG_TAG(RoutingExtension::TAG, 20) << "bundle " << meta.toString() << " queued for " << destination.getString() << IBRCOMMON_LOGGER_ENDL;
} catch (const dtn::core::P2PDialupException&) {
// lock the list of neighbors
ibrcommon::MutexLock l((**this).getNeighborDB());
// get the neighbor entry for the next hop
NeighborDatabase::NeighborEntry &entry = (**this).getNeighborDB().get(destination);
// release the transfer
entry.releaseTransfer(meta);
// and abort the query
throw NeighborDatabase::NeighborNotAvailableException();
} catch (const ibrcommon::Exception &e) {
// ignore any other error
}
}
void KeyExchangeEvent::raise(const dtn::data::EID &eid, const dtn::security::KeyExchangeData &data)
{
// raise the new event
dtn::core::EventDispatcher<KeyExchangeEvent>::queue( new KeyExchangeEvent(eid.getNode(), data) );
}
void NodeHandshakeExtension::HandshakeEndpoint::query(const dtn::data::EID &origin)
{
{
ibrcommon::MutexLock l(_blacklist_lock);
// only query once each 60 seconds
if (_blacklist[origin] > dtn::utils::Clock::getMonotonicTimestamp()) return;
_blacklist[origin] = dtn::utils::Clock::getMonotonicTimestamp() + 60;
}
// create a new request for the summary vector of the neighbor
NodeHandshake request(NodeHandshake::HANDSHAKE_REQUEST);
#ifdef IBRDTN_SUPPORT_COMPRESSION
// request compressed answer
request.addRequest(NodeHandshakeItem::REQUEST_COMPRESSED_ANSWER);
#endif
// walk through all extensions to generate a request
(*_callback).requestHandshake(origin, request);
IBRCOMMON_LOGGER_DEBUG_TAG(NodeHandshakeExtension::TAG, 15) << "handshake query from " << origin.getString() << ": " << request.toString() << IBRCOMMON_LOGGER_ENDL;
// create a new bundle with a zero timestamp (+age block)
dtn::data::Bundle req(true);
// set the source of the bundle
req.source = getWorkerURI();
// set the destination of the bundle
req.set(dtn::data::PrimaryBlock::DESTINATION_IS_SINGLETON, true);
req.destination = origin;
// set destination application
req.destination.setApplication("routing");
// limit the lifetime to 60 seconds
req.lifetime = 60;
// set high priority
req.set(dtn::data::PrimaryBlock::PRIORITY_BIT1, false);
req.set(dtn::data::PrimaryBlock::PRIORITY_BIT2, true);
dtn::data::PayloadBlock &p = req.push_back<PayloadBlock>();
ibrcommon::BLOB::Reference ref = p.getBLOB();
// serialize the request into the payload
{
ibrcommon::BLOB::iostream ios = ref.iostream();
(*ios) << request;
}
// add a schl block
dtn::data::ScopeControlHopLimitBlock &schl = req.push_front<dtn::data::ScopeControlHopLimitBlock>();
schl.setLimit(1);
// send the bundle
transmit(req);
}
