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I2P: End-to-End encrypted and anonymous Internet
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413 lines
14 KiB
413 lines
14 KiB
/* |
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* Copyright (c) 2013-2024, The PurpleI2P Project |
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* |
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* This file is part of Purple i2pd project and licensed under BSD3 |
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* |
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* See full license text in LICENSE file at top of project tree |
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*/ |
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#include "Log.h" |
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#include "util.h" |
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#include "ClientContext.h" |
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#include "I2PTunnel.h" // for GetLoopbackAddressFor |
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#include "UDPTunnel.h" |
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namespace i2p |
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{ |
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namespace client |
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{ |
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void I2PUDPServerTunnel::HandleRecvFromI2P(const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len) |
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{ |
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if (!m_LastSession || m_LastSession->Identity.GetLL()[0] != from.GetIdentHash ().GetLL()[0] || fromPort != m_LastSession->RemotePort) |
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m_LastSession = ObtainUDPSession(from, toPort, fromPort); |
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m_LastSession->IPSocket.send_to(boost::asio::buffer(buf, len), m_RemoteEndpoint); |
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m_LastSession->LastActivity = i2p::util::GetMillisecondsSinceEpoch(); |
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} |
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void I2PUDPServerTunnel::HandleRecvFromI2PRaw (uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len) |
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{ |
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if (m_LastSession && (fromPort != m_LastSession->RemotePort || toPort != m_LastSession->LocalPort)) |
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{ |
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std::lock_guard<std::mutex> lock(m_SessionsMutex); |
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auto it = m_Sessions.find (GetSessionIndex (fromPort, toPort)); |
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if (it != m_Sessions.end ()) |
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m_LastSession = it->second; |
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else |
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m_LastSession = nullptr; |
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} |
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if (m_LastSession) |
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{ |
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m_LastSession->IPSocket.send_to(boost::asio::buffer(buf, len), m_RemoteEndpoint); |
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m_LastSession->LastActivity = i2p::util::GetMillisecondsSinceEpoch(); |
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} |
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} |
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void I2PUDPServerTunnel::ExpireStale(const uint64_t delta) |
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{ |
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std::lock_guard<std::mutex> lock(m_SessionsMutex); |
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uint64_t now = i2p::util::GetMillisecondsSinceEpoch(); |
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auto itr = m_Sessions.begin(); |
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while(itr != m_Sessions.end()) |
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{ |
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if(now - itr->second->LastActivity >= delta ) |
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itr = m_Sessions.erase(itr); |
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else |
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itr++; |
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} |
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} |
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void I2PUDPClientTunnel::ExpireStale(const uint64_t delta) |
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{ |
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std::lock_guard<std::mutex> lock(m_SessionsMutex); |
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uint64_t now = i2p::util::GetMillisecondsSinceEpoch(); |
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std::vector<uint16_t> removePorts; |
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for (const auto & s : m_Sessions) { |
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if (now - s.second->second >= delta) |
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removePorts.push_back(s.first); |
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} |
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for(auto port : removePorts) { |
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m_Sessions.erase(port); |
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} |
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} |
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UDPSessionPtr I2PUDPServerTunnel::ObtainUDPSession(const i2p::data::IdentityEx& from, uint16_t localPort, uint16_t remotePort) |
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{ |
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auto ih = from.GetIdentHash(); |
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auto idx = GetSessionIndex (remotePort, localPort); |
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{ |
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std::lock_guard<std::mutex> lock(m_SessionsMutex); |
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auto it = m_Sessions.find (idx); |
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if (it != m_Sessions.end ()) |
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{ |
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if (it->second->Identity.GetLL()[0] == ih.GetLL()[0]) |
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{ |
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LogPrint(eLogDebug, "UDPServer: Found session ", it->second->IPSocket.local_endpoint(), " ", ih.ToBase32()); |
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return it->second; |
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} |
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else |
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{ |
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LogPrint(eLogWarning, "UDPServer: Session with from ", remotePort, " and to ", localPort, " ports already exists. But from different address. Removed"); |
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m_Sessions.erase (it); |
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} |
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} |
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} |
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boost::asio::ip::address addr; |
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/** create new udp session */ |
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if(m_IsUniqueLocal && m_LocalAddress.is_loopback()) |
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{ |
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auto ident = from.GetIdentHash(); |
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addr = GetLoopbackAddressFor(ident); |
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} |
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else |
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addr = m_LocalAddress; |
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auto s = std::make_shared<UDPSession>(boost::asio::ip::udp::endpoint(addr, 0), |
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m_LocalDest, m_RemoteEndpoint, ih, localPort, remotePort); |
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std::lock_guard<std::mutex> lock(m_SessionsMutex); |
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m_Sessions.emplace (idx, s); |
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return s; |
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} |
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UDPSession::UDPSession(boost::asio::ip::udp::endpoint localEndpoint, |
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const std::shared_ptr<i2p::client::ClientDestination> & localDestination, |
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const boost::asio::ip::udp::endpoint& endpoint, const i2p::data::IdentHash& to, |
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uint16_t ourPort, uint16_t theirPort) : |
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m_Destination(localDestination->GetDatagramDestination()), |
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IPSocket(localDestination->GetService(), localEndpoint), |
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Identity (to), SendEndpoint(endpoint), |
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LastActivity(i2p::util::GetMillisecondsSinceEpoch()), |
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LocalPort(ourPort), |
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RemotePort(theirPort) |
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{ |
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IPSocket.set_option (boost::asio::socket_base::receive_buffer_size (I2P_UDP_MAX_MTU )); |
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Receive(); |
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} |
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void UDPSession::Receive() |
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{ |
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LogPrint(eLogDebug, "UDPSession: Receive"); |
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IPSocket.async_receive_from(boost::asio::buffer(m_Buffer, I2P_UDP_MAX_MTU), |
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FromEndpoint, std::bind(&UDPSession::HandleReceived, this, std::placeholders::_1, std::placeholders::_2)); |
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} |
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void UDPSession::HandleReceived(const boost::system::error_code & ecode, std::size_t len) |
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{ |
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if(!ecode) |
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{ |
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LogPrint(eLogDebug, "UDPSession: Forward ", len, "B from ", FromEndpoint); |
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auto ts = i2p::util::GetMillisecondsSinceEpoch(); |
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auto session = m_Destination->GetSession (Identity); |
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if (ts > LastActivity + I2P_UDP_REPLIABLE_DATAGRAM_INTERVAL) |
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m_Destination->SendDatagram(session, m_Buffer, len, LocalPort, RemotePort); |
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else |
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m_Destination->SendRawDatagram(session, m_Buffer, len, LocalPort, RemotePort); |
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size_t numPackets = 0; |
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while (numPackets < i2p::datagram::DATAGRAM_SEND_QUEUE_MAX_SIZE) |
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{ |
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boost::system::error_code ec; |
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size_t moreBytes = IPSocket.available(ec); |
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if (ec || !moreBytes) break; |
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len = IPSocket.receive_from (boost::asio::buffer (m_Buffer, I2P_UDP_MAX_MTU), FromEndpoint, 0, ec); |
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m_Destination->SendRawDatagram (session, m_Buffer, len, LocalPort, RemotePort); |
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numPackets++; |
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} |
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if (numPackets > 0) |
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LogPrint(eLogDebug, "UDPSession: Forward more ", numPackets, "packets B from ", FromEndpoint); |
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m_Destination->FlushSendQueue (session); |
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LastActivity = ts; |
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Receive(); |
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} |
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else |
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LogPrint(eLogError, "UDPSession: ", ecode.message()); |
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} |
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I2PUDPServerTunnel::I2PUDPServerTunnel (const std::string & name, std::shared_ptr<i2p::client::ClientDestination> localDestination, |
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const boost::asio::ip::address& localAddress, const boost::asio::ip::udp::endpoint& forwardTo, uint16_t inPort, bool gzip) : |
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m_IsUniqueLocal (true), m_Name (name), m_LocalAddress (localAddress), |
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m_RemoteEndpoint (forwardTo), m_LocalDest (localDestination), m_inPort(inPort), m_Gzip (gzip) |
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{ |
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} |
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I2PUDPServerTunnel::~I2PUDPServerTunnel () |
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{ |
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Stop (); |
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} |
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void I2PUDPServerTunnel::Start () |
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{ |
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m_LocalDest->Start (); |
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auto dgram = m_LocalDest->CreateDatagramDestination (m_Gzip); |
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dgram->SetReceiver ( |
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std::bind (&I2PUDPServerTunnel::HandleRecvFromI2P, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5), |
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m_inPort |
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); |
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dgram->SetRawReceiver ( |
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std::bind (&I2PUDPServerTunnel::HandleRecvFromI2PRaw, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4), |
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m_inPort |
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); |
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} |
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void I2PUDPServerTunnel::Stop () |
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{ |
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auto dgram = m_LocalDest->GetDatagramDestination (); |
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if (dgram) { |
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dgram->ResetReceiver (m_inPort); |
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dgram->ResetRawReceiver (m_inPort); |
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} |
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} |
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std::vector<std::shared_ptr<DatagramSessionInfo> > I2PUDPServerTunnel::GetSessions () |
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{ |
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std::vector<std::shared_ptr<DatagramSessionInfo> > sessions; |
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std::lock_guard<std::mutex> lock (m_SessionsMutex); |
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for (const auto &it: m_Sessions) |
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{ |
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auto s = it.second; |
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if (!s->m_Destination) continue; |
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auto info = s->m_Destination->GetInfoForRemote (s->Identity); |
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if (!info) continue; |
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auto sinfo = std::make_shared<DatagramSessionInfo> (); |
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sinfo->Name = m_Name; |
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sinfo->LocalIdent = std::make_shared<i2p::data::IdentHash> (m_LocalDest->GetIdentHash ().data ()); |
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sinfo->RemoteIdent = std::make_shared<i2p::data::IdentHash> (s->Identity.data ()); |
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sinfo->CurrentIBGW = info->IBGW; |
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sinfo->CurrentOBEP = info->OBEP; |
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sessions.push_back (sinfo); |
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} |
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return sessions; |
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} |
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I2PUDPClientTunnel::I2PUDPClientTunnel (const std::string & name, const std::string &remoteDest, |
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const boost::asio::ip::udp::endpoint& localEndpoint, |
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std::shared_ptr<i2p::client::ClientDestination> localDestination, |
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uint16_t remotePort, bool gzip) : |
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m_Name (name), m_RemoteDest (remoteDest), m_LocalDest (localDestination), m_LocalEndpoint (localEndpoint), |
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m_ResolveThread (nullptr), m_LocalSocket (nullptr), RemotePort (remotePort), |
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m_LastPort (0), m_cancel_resolve (false), m_Gzip (gzip) |
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{ |
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} |
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I2PUDPClientTunnel::~I2PUDPClientTunnel () |
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{ |
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Stop (); |
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} |
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void I2PUDPClientTunnel::Start () |
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{ |
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// Reset flag in case of tunnel reload |
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if (m_cancel_resolve) m_cancel_resolve = false; |
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m_LocalSocket.reset (new boost::asio::ip::udp::socket (m_LocalDest->GetService (), m_LocalEndpoint)); |
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m_LocalSocket->set_option (boost::asio::socket_base::receive_buffer_size (I2P_UDP_MAX_MTU)); |
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m_LocalSocket->set_option (boost::asio::socket_base::reuse_address (true)); |
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auto dgram = m_LocalDest->CreateDatagramDestination (m_Gzip); |
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dgram->SetReceiver (std::bind (&I2PUDPClientTunnel::HandleRecvFromI2P, this, |
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std::placeholders::_1, std::placeholders::_2, |
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std::placeholders::_3, std::placeholders::_4, |
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std::placeholders::_5), |
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RemotePort |
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); |
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dgram->SetRawReceiver (std::bind (&I2PUDPClientTunnel::HandleRecvFromI2PRaw, this, |
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std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4), |
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RemotePort |
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); |
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m_LocalDest->Start (); |
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if (m_ResolveThread == nullptr) |
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m_ResolveThread = new std::thread (std::bind (&I2PUDPClientTunnel::TryResolving, this)); |
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RecvFromLocal (); |
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} |
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void I2PUDPClientTunnel::Stop () |
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{ |
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auto dgram = m_LocalDest->GetDatagramDestination (); |
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if (dgram) { |
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dgram->ResetReceiver (RemotePort); |
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dgram->ResetRawReceiver (RemotePort); |
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} |
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m_cancel_resolve = true; |
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m_Sessions.clear(); |
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if(m_LocalSocket && m_LocalSocket->is_open ()) |
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m_LocalSocket->close (); |
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if(m_ResolveThread) |
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{ |
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m_ResolveThread->join (); |
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delete m_ResolveThread; |
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m_ResolveThread = nullptr; |
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} |
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m_RemoteAddr = nullptr; |
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} |
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void I2PUDPClientTunnel::RecvFromLocal () |
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{ |
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m_LocalSocket->async_receive_from (boost::asio::buffer (m_RecvBuff, I2P_UDP_MAX_MTU), |
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m_RecvEndpoint, std::bind (&I2PUDPClientTunnel::HandleRecvFromLocal, this, std::placeholders::_1, std::placeholders::_2)); |
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} |
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void I2PUDPClientTunnel::HandleRecvFromLocal (const boost::system::error_code & ec, std::size_t transferred) |
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{ |
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if (m_cancel_resolve) { |
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LogPrint (eLogDebug, "UDP Client: Ignoring incoming data: stopping"); |
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return; |
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} |
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if (ec) { |
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LogPrint (eLogError, "UDP Client: Reading from socket error: ", ec.message (), ". Restarting listener..."); |
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RecvFromLocal (); // Restart listener and continue work |
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return; |
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} |
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if (!m_RemoteAddr || !m_RemoteAddr->IsIdentHash ()) // TODO: handle B33 |
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{ |
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LogPrint (eLogWarning, "UDP Client: Remote endpoint not resolved yet"); |
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RecvFromLocal (); |
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return; // drop, remote not resolved |
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} |
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auto remotePort = m_RecvEndpoint.port (); |
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if (!m_LastPort || m_LastPort != remotePort) |
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{ |
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auto itr = m_Sessions.find (remotePort); |
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if (itr != m_Sessions.end ()) |
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m_LastSession = itr->second; |
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else |
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{ |
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m_LastSession = std::make_shared<UDPConvo> (boost::asio::ip::udp::endpoint (m_RecvEndpoint), 0); |
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m_Sessions.emplace (remotePort, m_LastSession); |
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} |
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m_LastPort = remotePort; |
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} |
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// send off to remote i2p destination |
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auto ts = i2p::util::GetMillisecondsSinceEpoch (); |
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LogPrint (eLogDebug, "UDP Client: Send ", transferred, " to ", m_RemoteAddr->identHash.ToBase32 (), ":", RemotePort); |
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auto session = m_LocalDest->GetDatagramDestination ()->GetSession (m_RemoteAddr->identHash); |
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if (ts > m_LastSession->second + I2P_UDP_REPLIABLE_DATAGRAM_INTERVAL) |
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m_LocalDest->GetDatagramDestination ()->SendDatagram (session, m_RecvBuff, transferred, remotePort, RemotePort); |
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else |
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m_LocalDest->GetDatagramDestination ()->SendRawDatagram (session, m_RecvBuff, transferred, remotePort, RemotePort); |
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size_t numPackets = 0; |
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while (numPackets < i2p::datagram::DATAGRAM_SEND_QUEUE_MAX_SIZE) |
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{ |
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boost::system::error_code ec; |
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size_t moreBytes = m_LocalSocket->available (ec); |
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if (ec || !moreBytes) break; |
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transferred = m_LocalSocket->receive_from (boost::asio::buffer (m_RecvBuff, I2P_UDP_MAX_MTU), m_RecvEndpoint, 0, ec); |
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remotePort = m_RecvEndpoint.port (); |
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// TODO: check remotePort |
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m_LocalDest->GetDatagramDestination ()->SendRawDatagram (session, m_RecvBuff, transferred, remotePort, RemotePort); |
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numPackets++; |
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} |
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if (numPackets) |
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LogPrint (eLogDebug, "UDP Client: Sent ", numPackets, " more packets to ", m_RemoteAddr->identHash.ToBase32 ()); |
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m_LocalDest->GetDatagramDestination ()->FlushSendQueue (session); |
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// mark convo as active |
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if (m_LastSession) |
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m_LastSession->second = ts; |
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RecvFromLocal (); |
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} |
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std::vector<std::shared_ptr<DatagramSessionInfo> > I2PUDPClientTunnel::GetSessions () |
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{ |
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// TODO: implement |
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std::vector<std::shared_ptr<DatagramSessionInfo> > infos; |
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return infos; |
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} |
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void I2PUDPClientTunnel::TryResolving () |
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{ |
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i2p::util::SetThreadName ("UDP Resolver"); |
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LogPrint (eLogInfo, "UDP Tunnel: Trying to resolve ", m_RemoteDest); |
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while (!(m_RemoteAddr = context.GetAddressBook().GetAddress(m_RemoteDest)) && !m_cancel_resolve) |
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{ |
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LogPrint (eLogWarning, "UDP Tunnel: Failed to lookup ", m_RemoteDest); |
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std::this_thread::sleep_for (std::chrono::seconds (1)); |
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} |
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if (m_cancel_resolve) |
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{ |
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LogPrint(eLogError, "UDP Tunnel: Lookup of ", m_RemoteDest, " was cancelled"); |
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return; |
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} |
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if (!m_RemoteAddr) |
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{ |
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LogPrint (eLogError, "UDP Tunnel: ", m_RemoteDest, " not found"); |
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return; |
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} |
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LogPrint(eLogInfo, "UDP Tunnel: Resolved ", m_RemoteDest, " to ", m_RemoteAddr->identHash.ToBase32 ()); |
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} |
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void I2PUDPClientTunnel::HandleRecvFromI2P (const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len) |
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{ |
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if (m_RemoteAddr && from.GetIdentHash() == m_RemoteAddr->identHash) |
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HandleRecvFromI2PRaw (fromPort, toPort, buf, len); |
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else |
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LogPrint(eLogWarning, "UDP Client: Unwarranted traffic from ", from.GetIdentHash().ToBase32 ()); |
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} |
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void I2PUDPClientTunnel::HandleRecvFromI2PRaw (uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len) |
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{ |
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auto itr = m_Sessions.find (toPort); |
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// found convo ? |
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if (itr != m_Sessions.end ()) |
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{ |
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// found convo |
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if (len > 0) |
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{ |
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LogPrint (eLogDebug, "UDP Client: Got ", len, "B from ", m_RemoteAddr ? m_RemoteAddr->identHash.ToBase32 () : ""); |
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m_LocalSocket->send_to (boost::asio::buffer (buf, len), itr->second->first); |
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// mark convo as active |
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itr->second->second = i2p::util::GetMillisecondsSinceEpoch (); |
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} |
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} |
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else |
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LogPrint (eLogWarning, "UDP Client: Not tracking udp session using port ", (int) toPort); |
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} |
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} |
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}
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