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I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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291 lines
8.4 KiB
291 lines
8.4 KiB
#include <cassert> |
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#include "base64.h" |
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#include "Log.h" |
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#include "Destination.h" |
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#include "ClientContext.h" |
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#include "I2PTunnel.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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I2PTunnelConnection::I2PTunnelConnection (I2PService * owner, boost::asio::ip::tcp::socket * socket, |
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std::shared_ptr<const i2p::data::LeaseSet> leaseSet, int port): |
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I2PServiceHandler(owner), m_Socket (socket), m_RemoteEndpoint (socket->remote_endpoint ()), |
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m_IsQuiet (true) |
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{ |
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m_Stream = GetOwner()->GetLocalDestination ()->CreateStream (leaseSet, port); |
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} |
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I2PTunnelConnection::I2PTunnelConnection (I2PService * owner, |
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boost::asio::ip::tcp::socket * socket, std::shared_ptr<i2p::stream::Stream> stream): |
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I2PServiceHandler(owner), m_Socket (socket), m_Stream (stream), |
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m_RemoteEndpoint (socket->remote_endpoint ()), m_IsQuiet (true) |
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{ |
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} |
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I2PTunnelConnection::I2PTunnelConnection (I2PService * owner, std::shared_ptr<i2p::stream::Stream> stream, |
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boost::asio::ip::tcp::socket * socket, const boost::asio::ip::tcp::endpoint& target, bool quiet): |
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I2PServiceHandler(owner), m_Socket (socket), m_Stream (stream), |
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m_RemoteEndpoint (target), m_IsQuiet (quiet) |
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{ |
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} |
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I2PTunnelConnection::~I2PTunnelConnection () |
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{ |
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delete m_Socket; |
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} |
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void I2PTunnelConnection::I2PConnect (const uint8_t * msg, size_t len) |
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{ |
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if (m_Stream) |
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{ |
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if (msg) |
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m_Stream->Send (msg, len); // connect and send |
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else |
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m_Stream->Send (m_Buffer, 0); // connect |
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} |
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StreamReceive (); |
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Receive (); |
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} |
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void I2PTunnelConnection::Connect () |
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{ |
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if (m_Socket) |
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m_Socket->async_connect (m_RemoteEndpoint, std::bind (&I2PTunnelConnection::HandleConnect, |
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shared_from_this (), std::placeholders::_1)); |
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} |
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void I2PTunnelConnection::Terminate () |
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{ |
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if (Kill()) return; |
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if (m_Stream) |
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{ |
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m_Stream->Close (); |
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m_Stream.reset (); |
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} |
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m_Socket->close (); |
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Done(shared_from_this ()); |
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} |
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void I2PTunnelConnection::Receive () |
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{ |
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m_Socket->async_read_some (boost::asio::buffer(m_Buffer, I2P_TUNNEL_CONNECTION_BUFFER_SIZE), |
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std::bind(&I2PTunnelConnection::HandleReceived, shared_from_this (), |
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std::placeholders::_1, std::placeholders::_2)); |
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} |
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void I2PTunnelConnection::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred) |
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{ |
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if (ecode) |
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{ |
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LogPrint ("I2PTunnel read error: ", ecode.message ()); |
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if (ecode != boost::asio::error::operation_aborted) |
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Terminate (); |
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} |
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else |
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{ |
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if (m_Stream) |
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m_Stream->Send (m_Buffer, bytes_transferred); |
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Receive (); |
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} |
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} |
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void I2PTunnelConnection::HandleWrite (const boost::system::error_code& ecode) |
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{ |
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if (ecode) |
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{ |
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LogPrint ("I2PTunnel write error: ", ecode.message ()); |
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if (ecode != boost::asio::error::operation_aborted) |
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Terminate (); |
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} |
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else |
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StreamReceive (); |
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} |
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void I2PTunnelConnection::StreamReceive () |
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{ |
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if (m_Stream) |
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m_Stream->AsyncReceive (boost::asio::buffer (m_StreamBuffer, I2P_TUNNEL_CONNECTION_BUFFER_SIZE), |
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std::bind (&I2PTunnelConnection::HandleStreamReceive, shared_from_this (), |
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std::placeholders::_1, std::placeholders::_2), |
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I2P_TUNNEL_CONNECTION_MAX_IDLE); |
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} |
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void I2PTunnelConnection::HandleStreamReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred) |
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{ |
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if (ecode) |
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{ |
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LogPrint ("I2PTunnel stream read error: ", ecode.message ()); |
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if (ecode != boost::asio::error::operation_aborted) |
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Terminate (); |
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} |
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else |
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{ |
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boost::asio::async_write (*m_Socket, boost::asio::buffer (m_StreamBuffer, bytes_transferred), |
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std::bind (&I2PTunnelConnection::HandleWrite, shared_from_this (), std::placeholders::_1)); |
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} |
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} |
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void I2PTunnelConnection::HandleConnect (const boost::system::error_code& ecode) |
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{ |
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if (ecode) |
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{ |
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LogPrint ("I2PTunnel connect error: ", ecode.message ()); |
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Terminate (); |
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} |
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else |
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{ |
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LogPrint ("I2PTunnel connected"); |
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if (m_IsQuiet) |
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StreamReceive (); |
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else |
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{ |
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// send destination first like received from I2P |
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std::string dest = m_Stream->GetRemoteIdentity ().ToBase64 (); |
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dest += "\n"; |
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memcpy (m_StreamBuffer, dest.c_str (), dest.size ()); |
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HandleStreamReceive (boost::system::error_code (), dest.size ()); |
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} |
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Receive (); |
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} |
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} |
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/* This handler tries to stablish a connection with the desired server and dies if it fails to do so */ |
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class I2PClientTunnelHandler: public I2PServiceHandler, public std::enable_shared_from_this<I2PClientTunnelHandler> |
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{ |
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public: |
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I2PClientTunnelHandler (I2PClientTunnel * parent, i2p::data::IdentHash destination, |
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int destinationPort, boost::asio::ip::tcp::socket * socket): |
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I2PServiceHandler(parent), m_DestinationIdentHash(destination), |
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m_DestinationPort (destinationPort), m_Socket(socket) {}; |
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void Handle(); |
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void Terminate(); |
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private: |
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void HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream); |
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i2p::data::IdentHash m_DestinationIdentHash; |
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int m_DestinationPort; |
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boost::asio::ip::tcp::socket * m_Socket; |
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}; |
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void I2PClientTunnelHandler::Handle() |
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{ |
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GetOwner()->GetLocalDestination ()->CreateStream ( |
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std::bind (&I2PClientTunnelHandler::HandleStreamRequestComplete, shared_from_this(), std::placeholders::_1), |
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m_DestinationIdentHash, m_DestinationPort); |
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} |
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void I2PClientTunnelHandler::HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream) |
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{ |
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if (stream) |
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{ |
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if (Kill()) return; |
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LogPrint (eLogInfo,"New I2PTunnel connection"); |
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auto connection = std::make_shared<I2PTunnelConnection>(GetOwner(), m_Socket, stream); |
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GetOwner()->AddHandler (connection); |
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connection->I2PConnect (); |
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Done(shared_from_this()); |
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} |
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else |
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{ |
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LogPrint (eLogError,"I2P Client Tunnel Issue when creating the stream, check the previous warnings for more info."); |
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Terminate(); |
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} |
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} |
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void I2PClientTunnelHandler::Terminate() |
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{ |
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if (Kill()) return; |
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if (m_Socket) |
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{ |
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m_Socket->close(); |
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delete m_Socket; |
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m_Socket = nullptr; |
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} |
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Done(shared_from_this()); |
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} |
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I2PClientTunnel::I2PClientTunnel (const std::string& destination, int port, std::shared_ptr<ClientDestination> localDestination, int destinationPort): |
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TCPIPAcceptor (port,localDestination), m_Destination (destination), m_DestinationIdentHash (nullptr), m_DestinationPort (destinationPort) |
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{} |
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void I2PClientTunnel::Start () |
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{ |
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TCPIPAcceptor::Start (); |
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GetIdentHash(); |
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} |
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void I2PClientTunnel::Stop () |
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{ |
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TCPIPAcceptor::Stop(); |
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auto *originalIdentHash = m_DestinationIdentHash; |
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m_DestinationIdentHash = nullptr; |
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delete originalIdentHash; |
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} |
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/* HACK: maybe we should create a caching IdentHash provider in AddressBook */ |
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const i2p::data::IdentHash * I2PClientTunnel::GetIdentHash () |
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{ |
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if (!m_DestinationIdentHash) |
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{ |
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i2p::data::IdentHash identHash; |
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if (i2p::client::context.GetAddressBook ().GetIdentHash (m_Destination, identHash)) |
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m_DestinationIdentHash = new i2p::data::IdentHash (identHash); |
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else |
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LogPrint (eLogWarning,"Remote destination ", m_Destination, " not found"); |
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} |
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return m_DestinationIdentHash; |
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} |
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std::shared_ptr<I2PServiceHandler> I2PClientTunnel::CreateHandler(boost::asio::ip::tcp::socket * socket) |
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{ |
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const i2p::data::IdentHash *identHash = GetIdentHash(); |
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if (identHash) |
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return std::make_shared<I2PClientTunnelHandler>(this, *identHash, m_DestinationPort, socket); |
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else |
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return nullptr; |
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} |
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I2PServerTunnel::I2PServerTunnel (const std::string& address, int port, |
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std::shared_ptr<ClientDestination> localDestination, int inport): |
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I2PService (localDestination), m_Endpoint (boost::asio::ip::address::from_string (address), port) |
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{ |
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m_PortDestination = localDestination->CreateStreamingDestination (inport > 0 ? inport : port); |
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} |
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void I2PServerTunnel::Start () |
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{ |
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Accept (); |
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} |
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void I2PServerTunnel::Stop () |
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{ |
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ClearHandlers (); |
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} |
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void I2PServerTunnel::Accept () |
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{ |
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if (m_PortDestination) |
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m_PortDestination->SetAcceptor (std::bind (&I2PServerTunnel::HandleAccept, this, std::placeholders::_1)); |
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auto localDestination = GetLocalDestination (); |
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if (localDestination) |
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{ |
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if (!localDestination->IsAcceptingStreams ()) // set it as default if not set yet |
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localDestination->AcceptStreams (std::bind (&I2PServerTunnel::HandleAccept, this, std::placeholders::_1)); |
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} |
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else |
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LogPrint ("Local destination not set for server tunnel"); |
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} |
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void I2PServerTunnel::HandleAccept (std::shared_ptr<i2p::stream::Stream> stream) |
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{ |
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if (stream) |
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{ |
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auto conn = std::make_shared<I2PTunnelConnection> (this, stream, new boost::asio::ip::tcp::socket (GetService ()), m_Endpoint); |
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AddHandler (conn); |
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conn->Connect (); |
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} |
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} |
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} |
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}
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