I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <boost/bind.hpp>
#include "base64.h"
#include "Log.h"
#include "NetDb.h"
#include "I2PTunnel.h"
namespace i2p
{
namespace stream
{
I2PTunnelConnection::I2PTunnelConnection (boost::asio::ip::tcp::socket * socket,
const i2p::data::LeaseSet * leaseSet): m_Socket (socket)
{
m_Stream = i2p::stream::CreateStream (*leaseSet);
m_Stream->Send (m_Buffer, 0, 0); // connect
StreamReceive ();
Receive ();
}
I2PTunnelConnection::~I2PTunnelConnection ()
{
if (m_Stream)
{
m_Stream->Close ();
DeleteStream (m_Stream);
m_Stream = nullptr;
}
delete m_Socket;
}
void I2PTunnelConnection::Terminate ()
{
m_Socket->close ();
// TODO: remove from I2PTunnel
}
void I2PTunnelConnection::Receive ()
{
m_Socket->async_read_some (boost::asio::buffer(m_Buffer, I2P_TUNNEL_CONNECTION_BUFFER_SIZE),
boost::bind(&I2PTunnelConnection::HandleReceived, this,
boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
}
void I2PTunnelConnection::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint ("I2PTunnel read error: ", ecode.message ());
m_Stream->Close ();
Terminate ();
}
else
{
if (m_Stream)
m_Stream->Send (m_Buffer, bytes_transferred, 0);
Receive ();
}
}
void I2PTunnelConnection::HandleWrite (const boost::system::error_code& ecode)
{
if (ecode)
{
LogPrint ("I2PTunnel write error: ", ecode.message ());
m_Stream->Close ();
Terminate ();
}
else
StreamReceive ();
}
void I2PTunnelConnection::StreamReceive ()
{
if (m_Stream)
m_Stream->AsyncReceive (boost::asio::buffer (m_StreamBuffer, I2P_TUNNEL_CONNECTION_BUFFER_SIZE),
boost::bind (&I2PTunnelConnection::HandleStreamReceive, this,
boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred),
I2P_TUNNEL_CONNECTION_MAX_IDLE);
}
void I2PTunnelConnection::HandleStreamReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint ("I2PTunnel stream read error: ", ecode.message ());
Terminate ();
}
else
{
boost::asio::async_write (*m_Socket, boost::asio::buffer (m_StreamBuffer, bytes_transferred),
boost::bind (&I2PTunnelConnection::HandleWrite, this, boost::asio::placeholders::error));
}
}
I2PClientTunnel::I2PClientTunnel (boost::asio::io_service& service, const std::string& destination, int port):
m_Service (service), m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), port)),
m_Destination (destination), m_DestinationIdentHash (nullptr), m_RemoteLeaseSet (nullptr)
{
}
I2PClientTunnel::~I2PClientTunnel ()
{
Stop ();
}
void I2PClientTunnel::Start ()
{
auto pos = m_Destination.find(".b32.i2p");
if (pos != std::string::npos)
{
uint8_t hash[32];
i2p::data::Base32ToByteStream (m_Destination.c_str(), pos, hash, 32);
m_DestinationIdentHash = new i2p::data::IdentHash (hash);
}
else
{
pos = m_Destination.find (".i2p");
if (pos != std::string::npos)
{
auto identHash = i2p::data::netdb.FindAddress (m_Destination);
if (identHash)
m_DestinationIdentHash = new i2p::data::IdentHash (*identHash);
}
}
if (m_DestinationIdentHash)
{
i2p::data::netdb.Subscribe (*m_DestinationIdentHash);
m_RemoteLeaseSet = i2p::data::netdb.FindLeaseSet (*m_DestinationIdentHash);
}
else
LogPrint ("I2PTunnel unknown destination ", m_Destination);
m_Acceptor.listen ();
Accept ();
}
void I2PClientTunnel::Stop ()
{
m_Acceptor.close();
for (auto it: m_Connections)
delete it;
m_Connections.clear ();
m_DestinationIdentHash = nullptr;
}
void I2PClientTunnel::Accept ()
{
auto newSocket = new boost::asio::ip::tcp::socket (m_Service);
m_Acceptor.async_accept (*newSocket, boost::bind (&I2PClientTunnel::HandleAccept, this,
boost::asio::placeholders::error, newSocket));
}
void I2PClientTunnel::HandleAccept (const boost::system::error_code& ecode, boost::asio::ip::tcp::socket * socket)
{
if (!ecode)
{
if (!m_RemoteLeaseSet)
{
// try to get it
if (m_DestinationIdentHash)
m_RemoteLeaseSet = i2p::data::netdb.FindLeaseSet (*m_DestinationIdentHash);
else
{
auto identHash = i2p::data::netdb.FindAddress (m_Destination);
if (identHash)
{
m_DestinationIdentHash = new i2p::data::IdentHash (*identHash);
i2p::data::netdb.Subscribe (*m_DestinationIdentHash);
}
}
}
if (m_RemoteLeaseSet) // leaseSet found
{
LogPrint ("New I2PTunnel connection");
auto connection = new I2PTunnelConnection (socket, m_RemoteLeaseSet);
m_Connections.insert (connection);
}
else
{
LogPrint ("LeaseSet for I2PTunnel destination not found");
delete socket;
}
Accept ();
}
else
delete socket;
}
}
}