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I2P: End-to-End encrypted and anonymous Internet
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660 lines
19 KiB
660 lines
19 KiB
#include "Log.h" |
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#include "Crypto.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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i2p::crypto::DHKeys dh; |
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for (int i = 0; i < num; i++) |
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{ |
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auto pair = std::make_shared<i2p::crypto::DHKeys> (); |
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pair->GenerateKeys (); |
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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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std::shared_ptr<i2p::crypto::DHKeys> DHKeysPairSupplier::Acquire () |
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{ |
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{ |
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std::unique_lock<std::mutex> l(m_AcquiredMutex); |
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if (!m_Queue.empty ()) |
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{ |
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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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} |
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// queue is empty, create new |
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auto pair = std::make_shared<i2p::crypto::DHKeys> (); |
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pair->GenerateKeys (); |
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return pair; |
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} |
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void DHKeysPairSupplier::Return (std::shared_ptr<i2p::crypto::DHKeys> 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), m_PeerCleanupTimer (m_Service), |
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m_NTCPServer (nullptr), m_SSUServer (nullptr), m_DHKeysPairSupplier (5), // 5 pre-generated keys |
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m_TotalSentBytes(0), m_TotalReceivedBytes(0), m_InBandwidth (0), m_OutBandwidth (0), |
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m_LastInBandwidthUpdateBytes (0), m_LastOutBandwidthUpdateBytes (0), m_LastBandwidthUpdateTime (0) |
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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 (bool enableNTCP, bool enableSSU) |
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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 && enableNTCP) |
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{ |
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m_NTCPServer = new NTCPServer (); |
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m_NTCPServer->Start (); |
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if (!(m_NTCPServer->IsBoundV6() || m_NTCPServer->IsBoundV4())) { |
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/** failed to bind to NTCP */ |
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LogPrint(eLogError, "Transports: failed to bind to TCP"); |
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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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} |
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if (address->transportStyle == RouterInfo::eTransportSSU && address->host.is_v4 ()) |
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{ |
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if (!m_SSUServer && enableSSU) |
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{ |
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m_SSUServer = new SSUServer (address->port); |
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LogPrint (eLogInfo, "Transports: Start listening UDP port ", address->port); |
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try { |
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m_SSUServer->Start (); |
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} catch ( std::exception & ex ) { |
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LogPrint(eLogError, "Transports: Failed to bind to UDP port", address->port); |
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delete m_SSUServer; |
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m_SSUServer = nullptr; |
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continue; |
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} |
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DetectExternalIP (); |
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} |
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else |
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LogPrint (eLogError, "Transports: SSU server already exists"); |
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} |
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} |
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m_PeerCleanupTimer.expires_from_now (boost::posix_time::seconds(5*SESSION_CREATION_TIMEOUT)); |
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m_PeerCleanupTimer.async_wait (std::bind (&Transports::HandlePeerCleanupTimer, this, std::placeholders::_1)); |
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} |
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void Transports::Stop () |
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{ |
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m_PeerCleanupTimer.cancel (); |
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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 (eLogError, "Transports: runtime exception: ", ex.what ()); |
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} |
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} |
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} |
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void Transports::UpdateBandwidth () |
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{ |
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uint64_t ts = i2p::util::GetMillisecondsSinceEpoch (); |
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if (m_LastBandwidthUpdateTime > 0) |
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{ |
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auto delta = ts - m_LastBandwidthUpdateTime; |
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if (delta > 0) |
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{ |
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m_InBandwidth = (m_TotalReceivedBytes - m_LastInBandwidthUpdateBytes)*1000/delta; // per second |
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m_OutBandwidth = (m_TotalSentBytes - m_LastOutBandwidthUpdateBytes)*1000/delta; // per second |
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} |
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} |
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m_LastBandwidthUpdateTime = ts; |
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m_LastInBandwidthUpdateBytes = m_TotalReceivedBytes; |
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m_LastOutBandwidthUpdateBytes = m_TotalSentBytes; |
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} |
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bool Transports::IsBandwidthExceeded () const |
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{ |
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auto limit = i2p::context.GetBandwidthLimit() * 1024; // convert to bytes |
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auto bw = std::max (m_InBandwidth, m_OutBandwidth); |
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return bw > limit; |
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} |
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void Transports::SendMessage (const i2p::data::IdentHash& ident, std::shared_ptr<i2p::I2NPMessage> msg) |
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{ |
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SendMessages (ident, std::vector<std::shared_ptr<i2p::I2NPMessage> > {msg }); |
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} |
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void Transports::SendMessages (const i2p::data::IdentHash& ident, const std::vector<std::shared_ptr<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::PostMessages (i2p::data::IdentHash ident, std::vector<std::shared_ptr<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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bool connected = false; |
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try |
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{ |
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auto r = netdb.FindRouter (ident); |
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{ |
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std::unique_lock<std::mutex> l(m_PeersMutex); |
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it = m_Peers.insert (std::pair<i2p::data::IdentHash, Peer>(ident, { 0, r, {}, |
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i2p::util::GetSecondsSinceEpoch (), {} })).first; |
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} |
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connected = ConnectToPeer (ident, it->second); |
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} |
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catch (std::exception& ex) |
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{ |
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LogPrint (eLogError, "Transports: PostMessages exception:", ex.what ()); |
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} |
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if (!connected) return; |
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} |
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if (!it->second.sessions.empty ()) |
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it->second.sessions.front ()->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 && m_NTCPServer) |
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{ |
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#if BOOST_VERSION >= 104900 |
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if (!address->host.is_unspecified ()) // we have address now |
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#else |
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boost::system::error_code ecode; |
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address->host.to_string (ecode); |
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if (!ecode) |
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#endif |
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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 (eLogDebug, "Transports: Resolving NTCP ", 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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else |
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LogPrint (eLogDebug, "Transports: NTCP address is not present for ", i2p::data::GetIdentHashAbbreviation (ident), ", trying SSU"); |
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} |
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if (peer.numAttempts == 1)// SSU |
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{ |
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peer.numAttempts++; |
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if (m_SSUServer && peer.router->IsSSU (!context.SupportsV6 ())) |
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{ |
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auto address = peer.router->GetSSUAddress (!context.SupportsV6 ()); |
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#if BOOST_VERSION >= 104900 |
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if (!address->host.is_unspecified ()) // we have address now |
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#else |
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boost::system::error_code ecode; |
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address->host.to_string (ecode); |
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if (!ecode) |
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#endif |
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{ |
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m_SSUServer->CreateSession (peer.router, address->host, address->port); |
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return true; |
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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 (eLogDebug, "Transports: Resolving SSU ", address->addressString); |
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SSUResolve (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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LogPrint (eLogError, "Transports: No NTCP or SSU addresses available"); |
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peer.Done (); |
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std::unique_lock<std::mutex> l(m_PeersMutex); |
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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 (eLogInfo, "Transports: RouterInfo for ", ident.ToBase64 (), " 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, 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 (eLogDebug, "Transports: RouterInfo for ", ident.ToBase64 (), " 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 (eLogError, "Transports: RouterInfo not found, Failed to send messages"); |
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std::unique_lock<std::mutex> l(m_PeersMutex); |
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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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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 ()) |
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{ |
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auto& peer = it1->second; |
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if (!ecode && peer.router) |
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{ |
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while (it != boost::asio::ip::tcp::resolver::iterator()) |
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{ |
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auto address = (*it).endpoint ().address (); |
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LogPrint (eLogDebug, "Transports: ", (*it).host_name (), " has been resolved to ", address); |
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if (address.is_v4 () || context.SupportsV6 ()) |
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{ |
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auto addr = peer.router->GetNTCPAddress (); // TODO: take one we requested |
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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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break; |
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} |
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else |
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LogPrint (eLogInfo, "Transports: NTCP ", address, " is not supported"); |
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it++; |
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} |
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} |
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LogPrint (eLogError, "Transports: Unable to resolve NTCP address: ", ecode.message ()); |
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std::unique_lock<std::mutex> l(m_PeersMutex); |
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m_Peers.erase (it1); |
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} |
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} |
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void Transports::SSUResolve (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::HandleSSUResolve, this, |
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std::placeholders::_1, std::placeholders::_2, ident, resolver)); |
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} |
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void Transports::HandleSSUResolve (const boost::system::error_code& ecode, boost::asio::ip::tcp::resolver::iterator it, |
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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 ()) |
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{ |
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auto& peer = it1->second; |
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if (!ecode && peer.router) |
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{ |
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while (it != boost::asio::ip::tcp::resolver::iterator()) |
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{ |
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auto address = (*it).endpoint ().address (); |
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LogPrint (eLogDebug, "Transports: ", (*it).host_name (), " has been resolved to ", address); |
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if (address.is_v4 () || context.SupportsV6 ()) |
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{ |
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auto addr = peer.router->GetSSUAddress (); // TODO: take one we requested |
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if (addr) |
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{ |
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m_SSUServer->CreateSession (peer.router, address, addr->port); |
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return; |
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} |
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break; |
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} |
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else |
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LogPrint (eLogInfo, "Transports: SSU ", address, " is not supported"); |
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it++; |
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} |
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} |
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LogPrint (eLogError, "Transports: Unable to resolve SSU address: ", ecode.message ()); |
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std::unique_lock<std::mutex> l(m_PeersMutex); |
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m_Peers.erase (it1); |
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} |
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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 (eLogDebug, "Transports: SSU session closed"); |
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} |
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auto ntcpSession = m_NTCPServer ? m_NTCPServer->FindNTCPSession(router->GetIdentHash()) : nullptr; |
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if (ntcpSession) // try deleting ntcp session too |
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{ |
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ntcpSession->Terminate (); |
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LogPrint(eLogDebug, "Transports: NTCP session closed"); |
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} |
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} |
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void Transports::DetectExternalIP () |
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{ |
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if (m_SSUServer) |
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{ |
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i2p::context.SetStatus (eRouterStatusTesting); |
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for (int i = 0; i < 5; i++) |
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{ |
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auto router = i2p::data::netdb.GetRandomPeerTestRouter (); |
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if (router && router->IsSSU (!context.SupportsV6 ())) |
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m_SSUServer->CreateSession (router, true); // peer test |
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else |
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{ |
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// if not peer test capable routers found pick any |
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router = i2p::data::netdb.GetRandomRouter (); |
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if (router && router->IsSSU ()) |
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m_SSUServer->CreateSession (router); // no peer test |
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} |
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} |
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} |
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else |
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LogPrint (eLogError, "Transports: Can't detect external IP. SSU is not available"); |
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} |
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void Transports::PeerTest () |
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{ |
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if (m_SSUServer) |
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{ |
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bool statusChanged = false; |
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for (int i = 0; i < 5; i++) |
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{ |
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auto router = i2p::data::netdb.GetRandomPeerTestRouter (); |
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if (router && router->IsSSU (!context.SupportsV6 ())) |
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{ |
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if (!statusChanged) |
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{ |
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statusChanged = true; |
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i2p::context.SetStatus (eRouterStatusTesting); // first time only |
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} |
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m_SSUServer->CreateSession (router, true); // peer test |
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} |
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} |
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} |
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} |
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std::shared_ptr<i2p::crypto::DHKeys> 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 (std::shared_ptr<i2p::crypto::DHKeys> 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 remoteIdentity = session->GetRemoteIdentity (); |
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if (!remoteIdentity) return; |
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auto ident = remoteIdentity->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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bool sendDatabaseStore = true; |
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if (it->second.delayedMessages.size () > 0) |
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{ |
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// check if first message is our DatabaseStore (publishing) |
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auto firstMsg = it->second.delayedMessages[0]; |
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if (firstMsg && firstMsg->GetTypeID () == eI2NPDatabaseStore && |
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i2p::data::IdentHash(firstMsg->GetPayload () + DATABASE_STORE_KEY_OFFSET) == i2p::context.GetIdentHash ()) |
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sendDatabaseStore = false; // we have it in the list already |
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} |
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if (sendDatabaseStore) |
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session->SendI2NPMessages ({ CreateDatabaseStoreMsg () }); |
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it->second.sessions.push_back (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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{ |
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session->SendI2NPMessages ({ CreateDatabaseStoreMsg () }); // send DatabaseStore |
|
std::unique_lock<std::mutex> l(m_PeersMutex); |
|
m_Peers.insert (std::make_pair (ident, Peer{ 0, nullptr, { session }, i2p::util::GetSecondsSinceEpoch (), {} })); |
|
} |
|
}); |
|
} |
|
|
|
void Transports::PeerDisconnected (std::shared_ptr<TransportSession> session) |
|
{ |
|
m_Service.post([session, this]() |
|
{ |
|
auto remoteIdentity = session->GetRemoteIdentity (); |
|
if (!remoteIdentity) return; |
|
auto ident = remoteIdentity->GetIdentHash (); |
|
auto it = m_Peers.find (ident); |
|
if (it != m_Peers.end ()) |
|
{ |
|
it->second.sessions.remove (session); |
|
if (it->second.sessions.empty ()) // TODO: why? |
|
{ |
|
if (it->second.delayedMessages.size () > 0) |
|
ConnectToPeer (ident, it->second); |
|
else |
|
{ |
|
std::unique_lock<std::mutex> l(m_PeersMutex); |
|
m_Peers.erase (it); |
|
} |
|
} |
|
} |
|
}); |
|
} |
|
|
|
bool Transports::IsConnected (const i2p::data::IdentHash& ident) const |
|
{ |
|
std::unique_lock<std::mutex> l(m_PeersMutex); |
|
auto it = m_Peers.find (ident); |
|
return it != m_Peers.end (); |
|
} |
|
|
|
void Transports::HandlePeerCleanupTimer (const boost::system::error_code& ecode) |
|
{ |
|
if (ecode != boost::asio::error::operation_aborted) |
|
{ |
|
auto ts = i2p::util::GetSecondsSinceEpoch (); |
|
for (auto it = m_Peers.begin (); it != m_Peers.end (); ) |
|
{ |
|
if (it->second.sessions.empty () && ts > it->second.creationTime + SESSION_CREATION_TIMEOUT) |
|
{ |
|
LogPrint (eLogWarning, "Transports: Session to peer ", it->first.ToBase64 (), " has not been created in ", SESSION_CREATION_TIMEOUT, " seconds"); |
|
std::unique_lock<std::mutex> l(m_PeersMutex); |
|
it = m_Peers.erase (it); |
|
} |
|
else |
|
it++; |
|
} |
|
UpdateBandwidth (); // TODO: use separate timer(s) for it |
|
if (i2p::context.GetStatus () == eRouterStatusTesting) // if still testing, repeat peer test |
|
DetectExternalIP (); |
|
m_PeerCleanupTimer.expires_from_now (boost::posix_time::seconds(5*SESSION_CREATION_TIMEOUT)); |
|
m_PeerCleanupTimer.async_wait (std::bind (&Transports::HandlePeerCleanupTimer, this, std::placeholders::_1)); |
|
} |
|
} |
|
|
|
std::shared_ptr<const i2p::data::RouterInfo> Transports::GetRandomPeer () const |
|
{ |
|
if (m_Peers.empty ()) return nullptr; |
|
std::unique_lock<std::mutex> l(m_PeersMutex); |
|
auto it = m_Peers.begin (); |
|
std::advance (it, rand () % m_Peers.size ()); |
|
return it != m_Peers.end () ? it->second.router : nullptr; |
|
} |
|
void Transports::RestrictRoutes(std::vector<std::string> families) |
|
{ |
|
std::lock_guard<std::mutex> lock(m_FamilyMutex); |
|
m_TrustedFamilies.clear(); |
|
for ( auto fam : families ) |
|
m_TrustedFamilies.push_back(fam); |
|
} |
|
|
|
bool Transports::RoutesRestricted() const { |
|
std::lock_guard<std::mutex> lock(m_FamilyMutex); |
|
return m_TrustedFamilies.size() > 0; |
|
} |
|
|
|
/** XXX: if routes are not restricted this dies */ |
|
std::shared_ptr<const i2p::data::RouterInfo> Transports::GetRestrictedPeer() const { |
|
std::string fam; |
|
{ |
|
std::lock_guard<std::mutex> lock(m_FamilyMutex); |
|
// TODO: random family (?) |
|
fam = m_TrustedFamilies[0]; |
|
} |
|
boost::to_lower(fam); |
|
return i2p::data::netdb.GetRandomRouterInFamily(fam); |
|
} |
|
} |
|
} |
|
|
|
|