mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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826 lines
26 KiB
826 lines
26 KiB
#include <cassert> |
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#include "Base.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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|
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namespace i2p |
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{ |
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namespace client |
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{ |
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|
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/** set standard socket options */ |
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static void I2PTunnelSetSocketOptions(std::shared_ptr<boost::asio::ip::tcp::socket> socket) |
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{ |
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if (socket && socket->is_open()) |
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{ |
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boost::asio::socket_base::receive_buffer_size option(I2P_TUNNEL_CONNECTION_BUFFER_SIZE); |
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socket->set_option(option); |
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} |
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} |
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I2PTunnelConnection::I2PTunnelConnection (I2PService * owner, std::shared_ptr<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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std::shared_ptr<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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std::shared_ptr<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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} |
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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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static boost::asio::ip::address GetLoopbackAddressFor(const i2p::data::IdentHash & addr) |
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{ |
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boost::asio::ip::address_v4::bytes_type bytes; |
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const uint8_t * ident = addr; |
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bytes[0] = 127; |
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memcpy (bytes.data ()+1, ident, 3); |
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boost::asio::ip::address ourIP = boost::asio::ip::address_v4 (bytes); |
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return ourIP; |
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} |
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static void MapToLoopback(const std::shared_ptr<boost::asio::ip::tcp::socket> & sock, const i2p::data::IdentHash & addr) |
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{ |
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// bind to 127.x.x.x address |
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// where x.x.x are first three bytes from ident |
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auto ourIP = GetLoopbackAddressFor(addr); |
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sock->bind (boost::asio::ip::tcp::endpoint (ourIP, 0)); |
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} |
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void I2PTunnelConnection::Connect (bool mapToLoopback) |
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{ |
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I2PTunnelSetSocketOptions(m_Socket); |
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if (m_Socket) { |
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#ifdef __linux__ |
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if (m_RemoteEndpoint.address ().is_v4 () && |
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m_RemoteEndpoint.address ().to_v4 ().to_bytes ()[0] == 127 && mapToLoopback) |
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{ |
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m_Socket->open (boost::asio::ip::tcp::v4 ()); |
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auto ident = m_Stream->GetRemoteIdentity()->GetIdentHash(); |
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MapToLoopback(m_Socket, ident); |
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} |
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#endif |
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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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} |
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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->shutdown(boost::asio::ip::tcp::socket::shutdown_send); // avoid RST |
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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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if (ecode != boost::asio::error::operation_aborted) |
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{ |
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LogPrint (eLogError, "I2PTunnel: read error: ", ecode.message ()); |
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Terminate (); |
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} |
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} |
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else |
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{ |
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if (m_Stream) |
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{ |
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auto s = shared_from_this (); |
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m_Stream->AsyncSend (m_Buffer, bytes_transferred, |
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[s](const boost::system::error_code& ecode) |
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{ |
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if (!ecode) |
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s->Receive (); |
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else |
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s->Terminate (); |
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}); |
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} |
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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 (eLogError, "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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{ |
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if (m_Stream->GetStatus () == i2p::stream::eStreamStatusNew || |
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m_Stream->GetStatus () == i2p::stream::eStreamStatusOpen) // regular |
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{ |
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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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else // closed by peer |
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{ |
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// get remaning data |
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auto len = m_Stream->ReadSome (m_StreamBuffer, I2P_TUNNEL_CONNECTION_BUFFER_SIZE); |
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if (len > 0) // still some data |
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Write (m_StreamBuffer, len); |
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else // no more data |
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Terminate (); |
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} |
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} |
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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 (eLogError, "I2PTunnel: stream read error: ", ecode.message ()); |
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if (ecode != boost::asio::error::operation_aborted) |
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{ |
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if (bytes_transferred > 0) |
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Write (m_StreamBuffer, bytes_transferred); // postpone termination |
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else if (ecode == boost::asio::error::timed_out && m_Stream && m_Stream->IsOpen ()) |
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StreamReceive (); |
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else |
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Terminate (); |
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} |
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else |
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Terminate (); |
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} |
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else |
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Write (m_StreamBuffer, bytes_transferred); |
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} |
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void I2PTunnelConnection::Write (const uint8_t * buf, size_t len) |
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{ |
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boost::asio::async_write (*m_Socket, boost::asio::buffer (buf, len), boost::asio::transfer_all (), |
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std::bind (&I2PTunnelConnection::HandleWrite, shared_from_this (), std::placeholders::_1)); |
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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 (eLogError, "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 (eLogDebug, "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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if(sizeof(m_StreamBuffer) >= dest.size()) { |
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memcpy (m_StreamBuffer, dest.c_str (), dest.size ()); |
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} |
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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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I2PTunnelConnectionHTTP::I2PTunnelConnectionHTTP (I2PService * owner, std::shared_ptr<i2p::stream::Stream> stream, |
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std::shared_ptr<boost::asio::ip::tcp::socket> socket, |
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const boost::asio::ip::tcp::endpoint& target, const std::string& host): |
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I2PTunnelConnection (owner, stream, socket, target), m_Host (host), m_HeaderSent (false), m_From (stream->GetRemoteIdentity ()) |
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{ |
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} |
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void I2PTunnelConnectionHTTP::Write (const uint8_t * buf, size_t len) |
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{ |
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if (m_HeaderSent) |
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I2PTunnelConnection::Write (buf, len); |
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else |
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{ |
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m_InHeader.clear (); |
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m_InHeader.write ((const char *)buf, len); |
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std::string line; |
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bool endOfHeader = false; |
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while (!endOfHeader) |
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{ |
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std::getline(m_InHeader, line); |
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if (!m_InHeader.fail ()) |
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{ |
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if (line == "\r") endOfHeader = true; |
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else |
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{ |
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if (m_Host.length () > 0 && line.find ("Host:") != std::string::npos) |
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m_OutHeader << "Host: " << m_Host << "\r\n"; // override host |
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else |
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m_OutHeader << line << "\n"; |
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} |
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} |
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else |
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break; |
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} |
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// add X-I2P fields |
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if (m_From) |
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{ |
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m_OutHeader << X_I2P_DEST_B32 << ": " << context.GetAddressBook ().ToAddress(m_From->GetIdentHash ()) << "\r\n"; |
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m_OutHeader << X_I2P_DEST_HASH << ": " << m_From->GetIdentHash ().ToBase64 () << "\r\n"; |
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m_OutHeader << X_I2P_DEST_B64 << ": " << m_From->ToBase64 () << "\r\n"; |
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} |
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if (endOfHeader) |
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{ |
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m_OutHeader << "\r\n"; // end of header |
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m_OutHeader << m_InHeader.str ().substr (m_InHeader.tellg ()); // data right after header |
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m_HeaderSent = true; |
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I2PTunnelConnection::Write ((uint8_t *)m_OutHeader.str ().c_str (), m_OutHeader.str ().length ()); |
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} |
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} |
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} |
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I2PTunnelConnectionIRC::I2PTunnelConnectionIRC (I2PService * owner, std::shared_ptr<i2p::stream::Stream> stream, |
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std::shared_ptr<boost::asio::ip::tcp::socket> socket, |
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const boost::asio::ip::tcp::endpoint& target, const std::string& webircpass): |
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I2PTunnelConnection (owner, stream, socket, target), m_From (stream->GetRemoteIdentity ()), |
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m_NeedsWebIrc (webircpass.length() ? true : false), m_WebircPass (webircpass) |
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{ |
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} |
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void I2PTunnelConnectionIRC::Write (const uint8_t * buf, size_t len) |
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{ |
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m_OutPacket.str (""); |
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if (m_NeedsWebIrc) |
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{ |
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m_NeedsWebIrc = false; |
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m_OutPacket << "WEBIRC " << m_WebircPass << " cgiirc " << context.GetAddressBook ().ToAddress (m_From->GetIdentHash ()) << " 127.0.0.1\n"; |
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} |
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m_InPacket.clear (); |
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m_InPacket.write ((const char *)buf, len); |
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while (!m_InPacket.eof () && !m_InPacket.fail ()) |
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{ |
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std::string line; |
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std::getline (m_InPacket, line); |
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if (line.length () == 0 && m_InPacket.eof ()) |
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m_InPacket.str (""); |
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auto pos = line.find ("USER"); |
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if (!pos) // start of line |
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{ |
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pos = line.find (" "); |
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pos++; |
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pos = line.find (" ", pos); |
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pos++; |
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auto nextpos = line.find (" ", pos); |
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m_OutPacket << line.substr (0, pos); |
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m_OutPacket << context.GetAddressBook ().ToAddress (m_From->GetIdentHash ()); |
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m_OutPacket << line.substr (nextpos) << '\n'; |
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} |
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else |
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m_OutPacket << line << '\n'; |
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} |
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I2PTunnelConnection::Write ((uint8_t *)m_OutPacket.str ().c_str (), m_OutPacket.str ().length ()); |
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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, std::shared_ptr<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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std::shared_ptr<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 (eLogDebug, "I2PTunnel: new 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, "I2PTunnel: 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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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& name, const std::string& destination, |
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const std::string& address, int port, std::shared_ptr<ClientDestination> localDestination, int destinationPort): |
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TCPIPAcceptor (address, port, localDestination), m_Name (name), m_Destination (destination), |
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m_DestinationIdentHash (nullptr), m_DestinationPort (destinationPort) |
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{ |
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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, "I2PTunnel: 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(std::shared_ptr<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& name, const std::string& address, |
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int port, std::shared_ptr<ClientDestination> localDestination, int inport, bool gzip): |
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I2PService (localDestination), m_MapToLoopback(true), m_Name (name), m_Address (address), m_Port (port), m_IsAccessList (false) |
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{ |
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m_PortDestination = localDestination->CreateStreamingDestination (inport > 0 ? inport : port, gzip); |
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} |
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void I2PServerTunnel::Start () |
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{ |
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m_Endpoint.port (m_Port); |
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boost::system::error_code ec; |
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auto addr = boost::asio::ip::address::from_string (m_Address, ec); |
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if (!ec) |
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{ |
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m_Endpoint.address (addr); |
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Accept (); |
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} |
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else |
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{ |
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auto resolver = std::make_shared<boost::asio::ip::tcp::resolver>(GetService ()); |
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resolver->async_resolve (boost::asio::ip::tcp::resolver::query (m_Address, ""), |
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std::bind (&I2PServerTunnel::HandleResolve, this, |
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std::placeholders::_1, std::placeholders::_2, resolver)); |
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} |
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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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|
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void I2PServerTunnel::HandleResolve (const boost::system::error_code& ecode, boost::asio::ip::tcp::resolver::iterator it, |
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std::shared_ptr<boost::asio::ip::tcp::resolver> resolver) |
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{ |
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if (!ecode) |
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{ |
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auto addr = (*it).endpoint ().address (); |
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LogPrint (eLogInfo, "I2PTunnel: server tunnel ", (*it).host_name (), " has been resolved to ", addr); |
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m_Endpoint.address (addr); |
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Accept (); |
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} |
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else |
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LogPrint (eLogError, "I2PTunnel: Unable to resolve server tunnel address: ", ecode.message ()); |
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} |
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|
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void I2PServerTunnel::SetAccessList (const std::set<i2p::data::IdentHash>& accessList) |
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{ |
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m_AccessList = accessList; |
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m_IsAccessList = true; |
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} |
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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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|
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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 (eLogError, "I2PTunnel: Local destination not set for server tunnel"); |
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} |
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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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if (m_IsAccessList) |
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{ |
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if (!m_AccessList.count (stream->GetRemoteIdentity ()->GetIdentHash ())) |
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{ |
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LogPrint (eLogWarning, "I2PTunnel: Address ", stream->GetRemoteIdentity ()->GetIdentHash ().ToBase32 (), " is not in white list. Incoming connection dropped"); |
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stream->Close (); |
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return; |
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} |
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} |
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CreateI2PConnection (stream); |
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} |
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} |
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|
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void I2PServerTunnel::CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream) |
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{ |
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auto conn = std::make_shared<I2PTunnelConnection> (this, stream, std::make_shared<boost::asio::ip::tcp::socket> (GetService ()), GetEndpoint ()); |
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AddHandler (conn); |
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conn->Connect (m_MapToLoopback); |
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} |
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|
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I2PServerTunnelHTTP::I2PServerTunnelHTTP (const std::string& name, const std::string& address, |
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int port, std::shared_ptr<ClientDestination> localDestination, |
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const std::string& host, int inport, bool gzip): |
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I2PServerTunnel (name, address, port, localDestination, inport, gzip), |
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m_Host (host) |
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{ |
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} |
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|
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void I2PServerTunnelHTTP::CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream) |
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{ |
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auto conn = std::make_shared<I2PTunnelConnectionHTTP> (this, stream, |
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std::make_shared<boost::asio::ip::tcp::socket> (GetService ()), GetEndpoint (), m_Host); |
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AddHandler (conn); |
|
conn->Connect (); |
|
} |
|
|
|
I2PServerTunnelIRC::I2PServerTunnelIRC (const std::string& name, const std::string& address, |
|
int port, std::shared_ptr<ClientDestination> localDestination, |
|
const std::string& webircpass, int inport, bool gzip): |
|
I2PServerTunnel (name, address, port, localDestination, inport, gzip), |
|
m_WebircPass (webircpass) |
|
{ |
|
} |
|
|
|
void I2PServerTunnelIRC::CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream) |
|
{ |
|
auto conn = std::make_shared<I2PTunnelConnectionIRC> (this, stream, std::make_shared<boost::asio::ip::tcp::socket> (GetService ()), GetEndpoint (), this->m_WebircPass); |
|
AddHandler (conn); |
|
conn->Connect (); |
|
} |
|
|
|
void I2PUDPServerTunnel::HandleRecvFromI2P(const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len) |
|
{ |
|
std::lock_guard<std::mutex> lock(m_SessionsMutex); |
|
auto session = ObtainUDPSession(from, toPort, fromPort); |
|
session->IPSocket.send_to(boost::asio::buffer(buf, len), m_RemoteEndpoint); |
|
session->LastActivity = i2p::util::GetMillisecondsSinceEpoch(); |
|
} |
|
|
|
void I2PUDPServerTunnel::ExpireStale(const uint64_t delta) { |
|
std::lock_guard<std::mutex> lock(m_SessionsMutex); |
|
uint64_t now = i2p::util::GetMillisecondsSinceEpoch(); |
|
auto itr = m_Sessions.begin(); |
|
while(itr != m_Sessions.end()) { |
|
if(now - (*itr)->LastActivity >= delta ) |
|
itr = m_Sessions.erase(itr); |
|
else |
|
++itr; |
|
} |
|
} |
|
|
|
void I2PUDPClientTunnel::ExpireStale(const uint64_t delta) { |
|
std::lock_guard<std::mutex> lock(m_SessionsMutex); |
|
uint64_t now = i2p::util::GetMillisecondsSinceEpoch(); |
|
std::vector<uint16_t> removePorts; |
|
for (const auto & s : m_Sessions) { |
|
if (now - s.second.second >= delta) |
|
removePorts.push_back(s.first); |
|
} |
|
for(auto port : removePorts) { |
|
m_Sessions.erase(port); |
|
} |
|
} |
|
|
|
UDPSessionPtr I2PUDPServerTunnel::ObtainUDPSession(const i2p::data::IdentityEx& from, uint16_t localPort, uint16_t remotePort) |
|
{ |
|
auto ih = from.GetIdentHash(); |
|
for (auto & s : m_Sessions ) |
|
{ |
|
if ( s->Identity == ih) |
|
{ |
|
/** found existing session */ |
|
LogPrint(eLogDebug, "UDPServer: found session ", s->IPSocket.local_endpoint(), " ", ih.ToBase32()); |
|
return s; |
|
} |
|
} |
|
boost::asio::ip::address addr; |
|
/** create new udp session */ |
|
if(m_LocalAddress.is_loopback() && m_MapToLoopback) { |
|
auto ident = from.GetIdentHash(); |
|
addr = GetLoopbackAddressFor(ident); |
|
} else { |
|
addr = m_LocalAddress; |
|
} |
|
boost::asio::ip::udp::endpoint ep(addr, 0); |
|
m_Sessions.push_back(std::make_shared<UDPSession>(ep, m_LocalDest, m_RemoteEndpoint, &ih, localPort, remotePort)); |
|
auto & back = m_Sessions.back(); |
|
return back; |
|
} |
|
|
|
UDPSession::UDPSession(boost::asio::ip::udp::endpoint localEndpoint, |
|
const std::shared_ptr<i2p::client::ClientDestination> & localDestination, |
|
boost::asio::ip::udp::endpoint endpoint, const i2p::data::IdentHash * to, |
|
uint16_t ourPort, uint16_t theirPort) : |
|
m_Destination(localDestination->GetDatagramDestination()), |
|
IPSocket(localDestination->GetService(), localEndpoint), |
|
SendEndpoint(endpoint), |
|
LastActivity(i2p::util::GetMillisecondsSinceEpoch()), |
|
LocalPort(ourPort), |
|
RemotePort(theirPort) |
|
{ |
|
memcpy(Identity, to->data(), 32); |
|
Receive(); |
|
} |
|
|
|
|
|
void UDPSession::Receive() { |
|
LogPrint(eLogDebug, "UDPSession: Receive"); |
|
IPSocket.async_receive_from(boost::asio::buffer(m_Buffer, I2P_UDP_MAX_MTU), |
|
FromEndpoint, std::bind(&UDPSession::HandleReceived, this, std::placeholders::_1, std::placeholders::_2)); |
|
} |
|
|
|
void UDPSession::HandleReceived(const boost::system::error_code & ecode, std::size_t len) |
|
{ |
|
if(!ecode) |
|
{ |
|
LogPrint(eLogDebug, "UDPSession: forward ", len, "B from ", FromEndpoint); |
|
LastActivity = i2p::util::GetMillisecondsSinceEpoch(); |
|
m_Destination->SendDatagramTo(m_Buffer, len, Identity, LocalPort, RemotePort); |
|
Receive(); |
|
} else { |
|
LogPrint(eLogError, "UDPSession: ", ecode.message()); |
|
} |
|
} |
|
|
|
|
|
|
|
I2PUDPServerTunnel::I2PUDPServerTunnel(const std::string & name, std::shared_ptr<i2p::client::ClientDestination> localDestination, |
|
boost::asio::ip::address localAddress, boost::asio::ip::udp::endpoint forwardTo, uint16_t port) : |
|
m_MapToLoopback(true), |
|
m_Name(name), |
|
m_LocalAddress(localAddress), |
|
m_RemoteEndpoint(forwardTo) |
|
{ |
|
m_LocalDest = localDestination; |
|
m_LocalDest->Start(); |
|
auto dgram = m_LocalDest->CreateDatagramDestination(); |
|
dgram->SetReceiver(std::bind(&I2PUDPServerTunnel::HandleRecvFromI2P, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5)); |
|
} |
|
|
|
I2PUDPServerTunnel::~I2PUDPServerTunnel() |
|
{ |
|
auto dgram = m_LocalDest->GetDatagramDestination(); |
|
if (dgram) dgram->ResetReceiver(); |
|
|
|
LogPrint(eLogInfo, "UDPServer: done"); |
|
} |
|
|
|
void I2PUDPServerTunnel::Start() { |
|
m_LocalDest->Start(); |
|
} |
|
|
|
std::vector<std::shared_ptr<DatagramSessionInfo> > I2PUDPServerTunnel::GetSessions() |
|
{ |
|
std::vector<std::shared_ptr<DatagramSessionInfo> > sessions; |
|
std::lock_guard<std::mutex> lock(m_SessionsMutex); |
|
|
|
for ( UDPSessionPtr s : m_Sessions ) |
|
{ |
|
if (!s->m_Destination) continue; |
|
auto info = s->m_Destination->GetInfoForRemote(s->Identity); |
|
if(!info) continue; |
|
|
|
auto sinfo = std::make_shared<DatagramSessionInfo>(); |
|
sinfo->Name = m_Name; |
|
sinfo->LocalIdent = std::make_shared<i2p::data::IdentHash>(m_LocalDest->GetIdentHash().data()); |
|
sinfo->RemoteIdent = std::make_shared<i2p::data::IdentHash>(s->Identity.data()); |
|
sinfo->CurrentIBGW = info->IBGW; |
|
sinfo->CurrentOBEP = info->OBEP; |
|
sessions.push_back(sinfo); |
|
} |
|
return sessions; |
|
} |
|
|
|
I2PUDPClientTunnel::I2PUDPClientTunnel(const std::string & name, const std::string &remoteDest, |
|
boost::asio::ip::udp::endpoint localEndpoint, |
|
std::shared_ptr<i2p::client::ClientDestination> localDestination, |
|
uint16_t remotePort) : |
|
m_Name(name), |
|
m_RemoteDest(remoteDest), |
|
m_LocalDest(localDestination), |
|
m_LocalEndpoint(localEndpoint), |
|
m_RemoteIdent(nullptr), |
|
m_ResolveThread(nullptr), |
|
m_LocalSocket(localDestination->GetService(), localEndpoint), |
|
RemotePort(remotePort), |
|
m_cancel_resolve(false) |
|
{ |
|
auto dgram = m_LocalDest->CreateDatagramDestination(); |
|
dgram->SetReceiver(std::bind(&I2PUDPClientTunnel::HandleRecvFromI2P, this, |
|
std::placeholders::_1, std::placeholders::_2, |
|
std::placeholders::_3, std::placeholders::_4, |
|
std::placeholders::_5)); |
|
} |
|
|
|
|
|
|
|
void I2PUDPClientTunnel::Start() { |
|
m_LocalDest->Start(); |
|
if (m_ResolveThread == nullptr) |
|
m_ResolveThread = new std::thread(std::bind(&I2PUDPClientTunnel::TryResolving, this)); |
|
RecvFromLocal(); |
|
} |
|
|
|
void I2PUDPClientTunnel::RecvFromLocal() |
|
{ |
|
m_LocalSocket.async_receive_from(boost::asio::buffer(m_RecvBuff, I2P_UDP_MAX_MTU), |
|
m_RecvEndpoint, std::bind(&I2PUDPClientTunnel::HandleRecvFromLocal, this, std::placeholders::_1, std::placeholders::_2)); |
|
} |
|
|
|
void I2PUDPClientTunnel::HandleRecvFromLocal(const boost::system::error_code & ec, std::size_t transferred) |
|
{ |
|
if(ec) { |
|
LogPrint(eLogError, "UDP Client: ", ec.message()); |
|
return; |
|
} |
|
if(!m_RemoteIdent) { |
|
LogPrint(eLogWarning, "UDP Client: remote endpoint not resolved yet"); |
|
RecvFromLocal(); |
|
return; // drop, remote not resolved |
|
} |
|
auto remotePort = m_RecvEndpoint.port(); |
|
auto itr = m_Sessions.find(remotePort); |
|
if (itr == m_Sessions.end()) { |
|
// track new udp convo |
|
m_Sessions[remotePort] = {boost::asio::ip::udp::endpoint(m_RecvEndpoint), 0}; |
|
} |
|
// send off to remote i2p destination |
|
LogPrint(eLogDebug, "UDP Client: send ", transferred, " to ", m_RemoteIdent->ToBase32(), ":", RemotePort); |
|
m_LocalDest->GetDatagramDestination()->SendDatagramTo(m_RecvBuff, transferred, *m_RemoteIdent, remotePort, RemotePort); |
|
// mark convo as active |
|
m_Sessions[remotePort].second = i2p::util::GetMillisecondsSinceEpoch(); |
|
RecvFromLocal(); |
|
} |
|
|
|
std::vector<std::shared_ptr<DatagramSessionInfo> > I2PUDPClientTunnel::GetSessions() |
|
{ |
|
// TODO: implement |
|
std::vector<std::shared_ptr<DatagramSessionInfo> > infos; |
|
return infos; |
|
} |
|
|
|
void I2PUDPClientTunnel::TryResolving() { |
|
LogPrint(eLogInfo, "UDP Tunnel: Trying to resolve ", m_RemoteDest); |
|
i2p::data::IdentHash * h = new i2p::data::IdentHash; |
|
|
|
while(!context.GetAddressBook().GetIdentHash(m_RemoteDest, *h) && !m_cancel_resolve) |
|
{ |
|
LogPrint(eLogWarning, "UDP Tunnel: failed to lookup ", m_RemoteDest); |
|
std::this_thread::sleep_for(std::chrono::seconds(1)); |
|
} |
|
if(m_cancel_resolve) |
|
{ |
|
LogPrint(eLogError, "UDP Tunnel: lookup of ", m_RemoteDest, " was cancelled"); |
|
return; |
|
} |
|
m_RemoteIdent = h; |
|
LogPrint(eLogInfo, "UDP Tunnel: resolved ", m_RemoteDest, " to ", m_RemoteIdent->ToBase32()); |
|
} |
|
|
|
void I2PUDPClientTunnel::HandleRecvFromI2P(const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len) |
|
{ |
|
if(m_RemoteIdent && from.GetIdentHash() == *m_RemoteIdent) |
|
{ |
|
auto itr = m_Sessions.find(toPort); |
|
// found convo ? |
|
if(itr != m_Sessions.end()) |
|
{ |
|
// found convo |
|
if (len > 0) { |
|
LogPrint(eLogDebug, "UDP Client: got ", len, "B from ", from.GetIdentHash().ToBase32()); |
|
m_LocalSocket.send_to(boost::asio::buffer(buf, len), itr->second.first); |
|
// mark convo as active |
|
itr->second.second = i2p::util::GetMillisecondsSinceEpoch(); |
|
} |
|
} |
|
else |
|
LogPrint(eLogWarning, "UDP Client: not tracking udp session using port ", (int) toPort); |
|
} |
|
else |
|
LogPrint(eLogWarning, "UDP Client: unwarrented traffic from ", from.GetIdentHash().ToBase32()); |
|
|
|
} |
|
|
|
I2PUDPClientTunnel::~I2PUDPClientTunnel() { |
|
auto dgram = m_LocalDest->GetDatagramDestination(); |
|
if (dgram) dgram->ResetReceiver(); |
|
|
|
m_Sessions.clear(); |
|
|
|
if(m_LocalSocket.is_open()) |
|
m_LocalSocket.close(); |
|
|
|
m_cancel_resolve = true; |
|
|
|
if(m_ResolveThread) |
|
{ |
|
m_ResolveThread->join(); |
|
delete m_ResolveThread; |
|
m_ResolveThread = nullptr; |
|
} |
|
if (m_RemoteIdent) delete m_RemoteIdent; |
|
} |
|
} |
|
}
|
|
|