I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include "base64.h"
#include "Log.h"
#include "NetDb.h"
#include "Destination.h"
#include "ClientContext.h"
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#include "I2PTunnel.h"
namespace i2p
{
namespace client
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{
I2PTunnelConnection::I2PTunnelConnection (I2PTunnel * owner,
boost::asio::ip::tcp::socket * socket, const i2p::data::LeaseSet * leaseSet):
m_Socket (socket), m_Owner (owner), m_RemoteEndpoint (socket->remote_endpoint ())
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{
m_Stream = m_Owner->GetLocalDestination ()->CreateStream (*leaseSet);
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}
I2PTunnelConnection::I2PTunnelConnection (I2PTunnel * owner, std::shared_ptr<i2p::stream::Stream> stream,
boost::asio::ip::tcp::socket * socket, const boost::asio::ip::tcp::endpoint& target):
m_Socket (socket), m_Stream (stream), m_Owner (owner), m_RemoteEndpoint (target)
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{
}
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I2PTunnelConnection::~I2PTunnelConnection ()
{
delete m_Socket;
}
void I2PTunnelConnection::I2PConnect ()
{
m_Stream->Send (m_Buffer, 0); // connect
StreamReceive ();
Receive ();
}
void I2PTunnelConnection::Connect ()
{
if (m_Socket)
m_Socket->async_connect (m_RemoteEndpoint, std::bind (&I2PTunnelConnection::HandleConnect,
shared_from_this (), std::placeholders::_1));
}
void I2PTunnelConnection::Terminate ()
{
if (m_Stream)
{
m_Stream->Close ();
m_Stream.reset ();
}
m_Socket->close ();
if (m_Owner)
m_Owner->RemoveConnection (shared_from_this ());
}
void I2PTunnelConnection::Receive ()
{
m_Socket->async_read_some (boost::asio::buffer(m_Buffer, I2P_TUNNEL_CONNECTION_BUFFER_SIZE),
std::bind(&I2PTunnelConnection::HandleReceived, shared_from_this (),
std::placeholders::_1, std::placeholders::_2));
}
void I2PTunnelConnection::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint ("I2PTunnel read error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
else
{
if (m_Stream)
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m_Stream->Send (m_Buffer, bytes_transferred);
Receive ();
}
}
void I2PTunnelConnection::HandleWrite (const boost::system::error_code& ecode)
{
if (ecode)
{
LogPrint ("I2PTunnel write error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
else
StreamReceive ();
}
void I2PTunnelConnection::StreamReceive ()
{
if (m_Stream)
m_Stream->AsyncReceive (boost::asio::buffer (m_StreamBuffer, I2P_TUNNEL_CONNECTION_BUFFER_SIZE),
std::bind (&I2PTunnelConnection::HandleStreamReceive, shared_from_this (),
std::placeholders::_1, std::placeholders::_2),
I2P_TUNNEL_CONNECTION_MAX_IDLE);
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}
void I2PTunnelConnection::HandleStreamReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint ("I2PTunnel stream read error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
else
{
boost::asio::async_write (*m_Socket, boost::asio::buffer (m_StreamBuffer, bytes_transferred),
std::bind (&I2PTunnelConnection::HandleWrite, shared_from_this (), std::placeholders::_1));
}
}
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void I2PTunnelConnection::HandleConnect (const boost::system::error_code& ecode)
{
if (ecode)
{
LogPrint ("I2PTunnel connect error: ", ecode.message ());
Terminate ();
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}
else
{
LogPrint ("I2PTunnel connected");
StreamReceive ();
Receive ();
}
}
void I2PTunnel::AddConnection (std::shared_ptr<I2PTunnelConnection> conn)
{
m_Connections.insert (conn);
}
void I2PTunnel::RemoveConnection (std::shared_ptr<I2PTunnelConnection> conn)
{
m_Connections.erase (conn);
}
void I2PTunnel::ClearConnections ()
{
m_Connections.clear ();
}
I2PClientTunnel::I2PClientTunnel (boost::asio::io_service& service, const std::string& destination,
int port, ClientDestination * localDestination):
I2PTunnel (service, localDestination ? localDestination :
i2p::client::context.CreateNewLocalDestination (false, i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA256_P256)),
m_Acceptor (service, boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), port)),
m_Timer (service), m_Destination (destination), m_DestinationIdentHash (nullptr),
m_RemoteLeaseSet (nullptr)
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{
}
I2PClientTunnel::~I2PClientTunnel ()
{
Stop ();
}
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void I2PClientTunnel::Start ()
{
i2p::data::IdentHash identHash;
if (i2p::client::context.GetAddressBook ().GetIdentHash (m_Destination, identHash))
m_DestinationIdentHash = new i2p::data::IdentHash (identHash);
if (!m_DestinationIdentHash)
LogPrint ("I2PTunnel unknown destination ", m_Destination);
m_Acceptor.listen ();
Accept ();
}
void I2PClientTunnel::Stop ()
{
m_Acceptor.close();
m_Timer.cancel ();
ClearConnections ();
m_DestinationIdentHash = nullptr;
}
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void I2PClientTunnel::Accept ()
{
auto newSocket = new boost::asio::ip::tcp::socket (GetService ());
m_Acceptor.async_accept (*newSocket, std::bind (&I2PClientTunnel::HandleAccept, this,
std::placeholders::_1, newSocket));
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}
void I2PClientTunnel::HandleAccept (const boost::system::error_code& ecode, boost::asio::ip::tcp::socket * socket)
{
if (!ecode)
{
if (!m_DestinationIdentHash)
{
i2p::data::IdentHash identHash;
if (i2p::client::context.GetAddressBook ().GetIdentHash (m_Destination, identHash))
m_DestinationIdentHash = new i2p::data::IdentHash (identHash);
}
if (m_DestinationIdentHash)
{
// try to get a LeaseSet
m_RemoteLeaseSet = GetLocalDestination ()->FindLeaseSet (*m_DestinationIdentHash);
if (m_RemoteLeaseSet && m_RemoteLeaseSet->HasNonExpiredLeases ())
CreateConnection (socket);
else
{
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i2p::data::netdb.RequestDestination (*m_DestinationIdentHash, true, GetLocalDestination ()->GetTunnelPool ());
m_Timer.expires_from_now (boost::posix_time::seconds (I2P_TUNNEL_DESTINATION_REQUEST_TIMEOUT));
m_Timer.async_wait (std::bind (&I2PClientTunnel::HandleDestinationRequestTimer,
this, std::placeholders::_1, socket));
}
}
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else
{
LogPrint ("Remote destination ", m_Destination, " not found");
delete socket;
}
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Accept ();
}
else
delete socket;
}
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void I2PClientTunnel::HandleDestinationRequestTimer (const boost::system::error_code& ecode, boost::asio::ip::tcp::socket * socket)
{
if (ecode != boost::asio::error::operation_aborted)
{
if (m_DestinationIdentHash)
{
m_RemoteLeaseSet = GetLocalDestination ()->FindLeaseSet (*m_DestinationIdentHash);
CreateConnection (socket);
return;
}
}
delete socket;
}
void I2PClientTunnel::CreateConnection (boost::asio::ip::tcp::socket * socket)
{
if (m_RemoteLeaseSet) // leaseSet found
{
LogPrint ("New I2PTunnel connection");
auto connection = std::make_shared<I2PTunnelConnection>(this, socket, m_RemoteLeaseSet);
AddConnection (connection);
connection->I2PConnect ();
}
else
{
LogPrint ("LeaseSet for I2PTunnel destination not found");
delete socket;
}
}
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I2PServerTunnel::I2PServerTunnel (boost::asio::io_service& service, const std::string& address, int port,
ClientDestination * localDestination): I2PTunnel (service, localDestination),
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m_Endpoint (boost::asio::ip::address::from_string (address), port)
{
}
void I2PServerTunnel::Start ()
{
Accept ();
}
void I2PServerTunnel::Stop ()
{
ClearConnections ();
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}
void I2PServerTunnel::Accept ()
{
auto localDestination = GetLocalDestination ();
if (localDestination)
localDestination->AcceptStreams (std::bind (&I2PServerTunnel::HandleAccept, this, std::placeholders::_1));
else
LogPrint ("Local destination not set for server tunnel");
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}
void I2PServerTunnel::HandleAccept (std::shared_ptr<i2p::stream::Stream> stream)
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{
if (stream)
{
auto conn = std::make_shared<I2PTunnelConnection> (this, stream, new boost::asio::ip::tcp::socket (GetService ()), m_Endpoint);
AddConnection (conn);
conn->Connect ();
}
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}
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}
}