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429 lines
10 KiB
C++
429 lines
10 KiB
C++
#include <cryptopp/dh.h>
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#include "Log.h"
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#include "CryptoConst.h"
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#include "RouterContext.h"
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#include "I2NPProtocol.h"
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#include "NetDb.h"
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#include "Transports.h"
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using namespace i2p::data;
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namespace i2p
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{
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namespace transport
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{
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DHKeysPairSupplier::DHKeysPairSupplier (int size):
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m_QueueSize (size), m_IsRunning (false), m_Thread (nullptr)
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{
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}
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DHKeysPairSupplier::~DHKeysPairSupplier ()
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{
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Stop ();
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}
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void DHKeysPairSupplier::Start ()
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{
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m_IsRunning = true;
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m_Thread = new std::thread (std::bind (&DHKeysPairSupplier::Run, this));
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}
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void DHKeysPairSupplier::Stop ()
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{
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m_IsRunning = false;
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m_Acquired.notify_one ();
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if (m_Thread)
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{
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m_Thread->join ();
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delete m_Thread;
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m_Thread = 0;
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}
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}
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void DHKeysPairSupplier::Run ()
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{
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while (m_IsRunning)
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{
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int num;
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while ((num = m_QueueSize - m_Queue.size ()) > 0)
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CreateDHKeysPairs (num);
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std::unique_lock<std::mutex> l(m_AcquiredMutex);
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m_Acquired.wait (l); // wait for element gets aquired
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}
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}
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void DHKeysPairSupplier::CreateDHKeysPairs (int num)
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{
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if (num > 0)
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{
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CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
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for (int i = 0; i < num; i++)
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{
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i2p::transport::DHKeysPair * pair = new i2p::transport::DHKeysPair ();
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dh.GenerateKeyPair(m_Rnd, pair->privateKey, pair->publicKey);
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std::unique_lock<std::mutex> l(m_AcquiredMutex);
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m_Queue.push (pair);
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}
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}
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}
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DHKeysPair * DHKeysPairSupplier::Acquire ()
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{
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if (!m_Queue.empty ())
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{
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std::unique_lock<std::mutex> l(m_AcquiredMutex);
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auto pair = m_Queue.front ();
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m_Queue.pop ();
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m_Acquired.notify_one ();
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return pair;
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}
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else // queue is empty, create new
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{
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DHKeysPair * pair = new DHKeysPair ();
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CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
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dh.GenerateKeyPair(m_Rnd, pair->privateKey, pair->publicKey);
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return pair;
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}
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}
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void DHKeysPairSupplier::Return (DHKeysPair * pair)
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{
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std::unique_lock<std::mutex> l(m_AcquiredMutex);
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m_Queue.push (pair);
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}
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Transports transports;
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Transports::Transports ():
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m_IsRunning (false), m_Thread (nullptr), m_Work (m_Service),
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m_NTCPServer (nullptr), m_SSUServer (nullptr),
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m_DHKeysPairSupplier (5) // 5 pre-generated keys
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{
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}
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Transports::~Transports ()
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{
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Stop ();
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}
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void Transports::Start ()
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{
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m_DHKeysPairSupplier.Start ();
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m_IsRunning = true;
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m_Thread = new std::thread (std::bind (&Transports::Run, this));
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// create acceptors
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auto addresses = context.GetRouterInfo ().GetAddresses ();
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for (auto& address : addresses)
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{
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if (!m_NTCPServer)
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{
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m_NTCPServer = new NTCPServer (address.port);
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m_NTCPServer->Start ();
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}
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if (address.transportStyle == RouterInfo::eTransportSSU && address.host.is_v4 ())
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{
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if (!m_SSUServer)
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{
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m_SSUServer = new SSUServer (address.port);
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LogPrint ("Start listening UDP port ", address.port);
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m_SSUServer->Start ();
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DetectExternalIP ();
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}
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else
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LogPrint ("SSU server already exists");
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}
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}
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}
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void Transports::Stop ()
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{
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m_Peers.clear ();
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if (m_SSUServer)
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{
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m_SSUServer->Stop ();
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delete m_SSUServer;
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m_SSUServer = nullptr;
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}
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if (m_NTCPServer)
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{
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m_NTCPServer->Stop ();
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delete m_NTCPServer;
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m_NTCPServer = nullptr;
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}
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m_DHKeysPairSupplier.Stop ();
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m_IsRunning = false;
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m_Service.stop ();
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if (m_Thread)
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{
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m_Thread->join ();
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delete m_Thread;
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m_Thread = nullptr;
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}
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}
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void Transports::Run ()
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{
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while (m_IsRunning)
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{
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try
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{
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m_Service.run ();
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}
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catch (std::exception& ex)
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{
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LogPrint ("Transports: ", ex.what ());
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}
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}
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}
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void Transports::SendMessage (const i2p::data::IdentHash& ident, i2p::I2NPMessage * msg)
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{
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m_Service.post (std::bind (&Transports::PostMessage, this, ident, msg));
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}
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void Transports::SendMessages (const i2p::data::IdentHash& ident, const std::vector<i2p::I2NPMessage *>& msgs)
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{
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m_Service.post (std::bind (&Transports::PostMessages, this, ident, msgs));
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}
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void Transports::PostMessage (const i2p::data::IdentHash& ident, i2p::I2NPMessage * msg)
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{
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if (ident == i2p::context.GetRouterInfo ().GetIdentHash ())
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{
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// we send it to ourself
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i2p::HandleI2NPMessage (msg);
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return;
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}
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auto it = m_Peers.find (ident);
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if (it == m_Peers.end ())
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{
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auto r = netdb.FindRouter (ident);
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it = m_Peers.insert (std::pair<i2p::data::IdentHash, Peer>(ident, { 0, r, nullptr})).first;
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if (!ConnectToPeer (ident, it->second))
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{
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DeleteI2NPMessage (msg);
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return;
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}
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}
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if (it->second.session)
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it->second.session->SendI2NPMessage (msg);
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else
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it->second.delayedMessages.push_back (msg);
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}
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void Transports::PostMessages (const i2p::data::IdentHash& ident, std::vector<i2p::I2NPMessage *> msgs)
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{
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if (ident == i2p::context.GetRouterInfo ().GetIdentHash ())
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{
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// we send it to ourself
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for (auto it: msgs)
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i2p::HandleI2NPMessage (it);
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return;
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}
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auto it = m_Peers.find (ident);
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if (it == m_Peers.end ())
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{
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auto r = netdb.FindRouter (ident);
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it = m_Peers.insert (std::pair<i2p::data::IdentHash, Peer>(ident, { 0, r, nullptr})).first;
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if (!ConnectToPeer (ident, it->second))
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{
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for (auto it1: msgs)
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DeleteI2NPMessage (it1);
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return;
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}
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}
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if (it->second.session)
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it->second.session->SendI2NPMessages (msgs);
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else
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{
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for (auto it1: msgs)
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it->second.delayedMessages.push_back (it1);
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}
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}
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bool Transports::ConnectToPeer (const i2p::data::IdentHash& ident, Peer& peer)
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{
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if (peer.router) // we have RI already
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{
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if (!peer.numAttempts) // NTCP
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{
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peer.numAttempts++;
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auto address = peer.router->GetNTCPAddress (!context.SupportsV6 ());
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if (address)
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{
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if (!address->host.is_unspecified ()) // we have address now
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{
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if (!peer.router->UsesIntroducer () && !peer.router->IsUnreachable ())
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{
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auto s = std::make_shared<NTCPSession> (*m_NTCPServer, peer.router);
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m_NTCPServer->Connect (address->host, address->port, s);
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return true;
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}
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}
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else // we don't have address
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{
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if (address->addressString.length () > 0) // trying to resolve
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{
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LogPrint (eLogInfo, "Resolving ", address->addressString);
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NTCPResolve (address->addressString, ident);
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return true;
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}
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}
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}
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}
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else if (peer.numAttempts == 1)// SSU
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{
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peer.numAttempts++;
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if (m_SSUServer)
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{
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if (m_SSUServer->GetSession (peer.router))
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return true;
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}
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}
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LogPrint (eLogError, "No NTCP and SSU addresses available");
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m_Peers.erase (ident);
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return false;
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}
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else // otherwise request RI
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{
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LogPrint ("Router not found. Requested");
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i2p::data::netdb.RequestDestination (ident, std::bind (
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&Transports::RequestComplete, this, std::placeholders::_1, ident));
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}
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return true;
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}
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void Transports::RequestComplete (std::shared_ptr<const i2p::data::RouterInfo> r, const i2p::data::IdentHash& ident)
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{
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m_Service.post (std::bind (&Transports::HandleRequestComplete, this, r, ident));
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}
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void Transports::HandleRequestComplete (std::shared_ptr<const i2p::data::RouterInfo> r, const i2p::data::IdentHash& ident)
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{
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auto it = m_Peers.find (ident);
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if (it != m_Peers.end ())
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{
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if (r)
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{
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LogPrint ("Router found. Trying to connect");
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it->second.router = r;
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ConnectToPeer (ident, it->second);
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}
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else
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{
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LogPrint ("Router not found. Failed to send messages");
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m_Peers.erase (it);
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}
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}
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}
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void Transports::NTCPResolve (const std::string& addr, const i2p::data::IdentHash& ident)
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{
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auto resolver = std::make_shared<boost::asio::ip::tcp::resolver>(m_Service);
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resolver->async_resolve (boost::asio::ip::tcp::resolver::query (addr, ""),
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std::bind (&Transports::HandleNTCPResolve, this,
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std::placeholders::_1, std::placeholders::_2, ident, resolver));
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}
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void Transports::HandleNTCPResolve (const boost::system::error_code& ecode, boost::asio::ip::tcp::resolver::iterator it,
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const i2p::data::IdentHash& ident, std::shared_ptr<boost::asio::ip::tcp::resolver> resolver)
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{
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auto it1 = m_Peers.find (ident);
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if (it1 != m_Peers.end () && it1->second.router)
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{
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auto& peer = it1->second;
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if (!ecode)
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{
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auto address = (*it).endpoint ().address ();
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LogPrint (eLogInfo, (*it).host_name (), " has been resolved to ", address);
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auto addr = peer.router->GetNTCPAddress ();
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if (addr)
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{
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auto s = std::make_shared<NTCPSession> (*m_NTCPServer, peer.router);
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m_NTCPServer->Connect (address, addr->port, s);
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return;
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}
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}
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}
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LogPrint (eLogError, "Unable to resolve NTCP address: ", ecode.message ());
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m_Peers.erase (it1);
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}
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void Transports::CloseSession (std::shared_ptr<const i2p::data::RouterInfo> router)
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{
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if (!router) return;
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m_Service.post (std::bind (&Transports::PostCloseSession, this, router));
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}
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void Transports::PostCloseSession (std::shared_ptr<const i2p::data::RouterInfo> router)
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{
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auto ssuSession = m_SSUServer ? m_SSUServer->FindSession (router) : nullptr;
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if (ssuSession) // try SSU first
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{
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m_SSUServer->DeleteSession (ssuSession);
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LogPrint ("SSU session closed");
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}
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// TODO: delete NTCP
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}
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void Transports::DetectExternalIP ()
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{
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for (int i = 0; i < 5; i++)
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{
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auto router = i2p::data::netdb.GetRandomRouter ();
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if (router && router->IsSSU () && m_SSUServer)
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m_SSUServer->GetSession (router, true); // peer test
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}
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}
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DHKeysPair * Transports::GetNextDHKeysPair ()
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{
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return m_DHKeysPairSupplier.Acquire ();
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}
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void Transports::ReuseDHKeysPair (DHKeysPair * pair)
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{
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m_DHKeysPairSupplier.Return (pair);
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}
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void Transports::PeerConnected (std::shared_ptr<TransportSession> session)
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{
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m_Service.post([session, this]()
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{
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auto ident = session->GetRemoteIdentity ().GetIdentHash ();
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auto it = m_Peers.find (ident);
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if (it != m_Peers.end ())
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{
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it->second.session = session;
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session->SendI2NPMessages (it->second.delayedMessages);
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it->second.delayedMessages.clear ();
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}
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else // incoming connection
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m_Peers[ident] = { 0, nullptr, session };
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});
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}
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void Transports::PeerDisconnected (std::shared_ptr<TransportSession> session)
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{
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m_Service.post([session, this]()
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{
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auto ident = session->GetRemoteIdentity ().GetIdentHash ();
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auto it = m_Peers.find (ident);
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if (it != m_Peers.end ())
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{
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if (it->second.delayedMessages.size () > 0)
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ConnectToPeer (ident, it->second);
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else
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m_Peers.erase (it);
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}
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});
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}
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}
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}
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