I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <cassert>
#include "Base.h"
#include "Log.h"
#include "Destination.h"
#include "ClientContext.h"
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#include "I2PTunnel.h"
namespace i2p
{
namespace client
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{
I2PTunnelConnection::I2PTunnelConnection (I2PService * owner, std::shared_ptr<boost::asio::ip::tcp::socket> socket,
std::shared_ptr<const i2p::data::LeaseSet> leaseSet, int port):
I2PServiceHandler(owner), m_Socket (socket), m_RemoteEndpoint (socket->remote_endpoint ()),
m_IsQuiet (true)
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{
m_Stream = GetOwner()->GetLocalDestination ()->CreateStream (leaseSet, port);
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}
I2PTunnelConnection::I2PTunnelConnection (I2PService * owner,
std::shared_ptr<boost::asio::ip::tcp::socket> socket, std::shared_ptr<i2p::stream::Stream> stream):
I2PServiceHandler(owner), m_Socket (socket), m_Stream (stream),
m_RemoteEndpoint (socket->remote_endpoint ()), m_IsQuiet (true)
{
}
I2PTunnelConnection::I2PTunnelConnection (I2PService * owner, std::shared_ptr<i2p::stream::Stream> stream,
std::shared_ptr<boost::asio::ip::tcp::socket> socket, const boost::asio::ip::tcp::endpoint& target, bool quiet):
I2PServiceHandler(owner), m_Socket (socket), m_Stream (stream),
m_RemoteEndpoint (target), m_IsQuiet (quiet)
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{
}
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I2PTunnelConnection::~I2PTunnelConnection ()
{
}
void I2PTunnelConnection::I2PConnect (const uint8_t * msg, size_t len)
{
if (m_Stream)
{
if (msg)
m_Stream->Send (msg, len); // connect and send
else
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 (Kill()) return;
if (m_Stream)
{
m_Stream->Close ();
m_Stream.reset ();
}
m_Socket->close ();
Done(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 (eLogError, "I2PTunnel: read error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
else
{
if (m_Stream)
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{
auto s = shared_from_this ();
m_Stream->AsyncSend (m_Buffer, bytes_transferred,
[s](const boost::system::error_code& ecode)
{
if (!ecode)
s->Receive ();
else
s->Terminate ();
});
}
}
}
void I2PTunnelConnection::HandleWrite (const boost::system::error_code& ecode)
{
if (ecode)
{
LogPrint (eLogError, "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 (eLogError, "I2PTunnel: stream read error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
else
Write (m_StreamBuffer, bytes_transferred);
}
void I2PTunnelConnection::Write (const uint8_t * buf, size_t len)
{
m_Socket->async_send (boost::asio::buffer (buf, len),
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 (eLogError, "I2PTunnel: connect error: ", ecode.message ());
Terminate ();
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}
else
{
LogPrint (eLogDebug, "I2PTunnel: connected");
if (m_IsQuiet)
StreamReceive ();
else
{
// send destination first like received from I2P
std::string dest = m_Stream->GetRemoteIdentity ()->ToBase64 ();
dest += "\n";
memcpy (m_StreamBuffer, dest.c_str (), dest.size ());
HandleStreamReceive (boost::system::error_code (), dest.size ());
}
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Receive ();
}
}
I2PTunnelConnectionHTTP::I2PTunnelConnectionHTTP (I2PService * owner, std::shared_ptr<i2p::stream::Stream> stream,
std::shared_ptr<boost::asio::ip::tcp::socket> socket,
const boost::asio::ip::tcp::endpoint& target, const std::string& host):
I2PTunnelConnection (owner, stream, socket, target), m_Host (host), m_HeaderSent (false), m_From (stream->GetRemoteIdentity ())
{
}
void I2PTunnelConnectionHTTP::Write (const uint8_t * buf, size_t len)
{
if (m_HeaderSent)
I2PTunnelConnection::Write (buf, len);
else
{
m_InHeader.clear ();
m_InHeader.write ((const char *)buf, len);
std::string line;
bool endOfHeader = false;
while (!endOfHeader)
{
std::getline(m_InHeader, line);
if (!m_InHeader.fail ())
{
if (line.find ("Host:") != std::string::npos)
m_OutHeader << "Host: " << m_Host << "\r\n";
else
m_OutHeader << line << "\n";
if (line == "\r") endOfHeader = true;
}
else
break;
}
// add X-I2P fields
if (m_From)
{
m_OutHeader << X_I2P_DEST_HASH << ": " << m_From->GetIdentHash ().ToBase64 () << "\r\n";
// m_OutHeader << X_I2P_DEST_B64 << ": " << m_From->ToBase64 () << "\r\n";
}
if (endOfHeader)
{
m_OutHeader << m_InHeader.str (); // data right after header
m_HeaderSent = true;
I2PTunnelConnection::Write ((uint8_t *)m_OutHeader.str ().c_str (), m_OutHeader.str ().length ());
}
}
}
/* This handler tries to stablish a connection with the desired server and dies if it fails to do so */
class I2PClientTunnelHandler: public I2PServiceHandler, public std::enable_shared_from_this<I2PClientTunnelHandler>
{
public:
I2PClientTunnelHandler (I2PClientTunnel * parent, i2p::data::IdentHash destination,
int destinationPort, std::shared_ptr<boost::asio::ip::tcp::socket> socket):
I2PServiceHandler(parent), m_DestinationIdentHash(destination),
m_DestinationPort (destinationPort), m_Socket(socket) {};
void Handle();
void Terminate();
private:
void HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream);
i2p::data::IdentHash m_DestinationIdentHash;
int m_DestinationPort;
std::shared_ptr<boost::asio::ip::tcp::socket> m_Socket;
};
void I2PClientTunnelHandler::Handle()
{
GetOwner()->GetLocalDestination ()->CreateStream (
std::bind (&I2PClientTunnelHandler::HandleStreamRequestComplete, shared_from_this(), std::placeholders::_1),
m_DestinationIdentHash, m_DestinationPort);
}
void I2PClientTunnelHandler::HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream)
{
if (stream)
{
if (Kill()) return;
LogPrint (eLogDebug, "I2PTunnel: new connection");
auto connection = std::make_shared<I2PTunnelConnection>(GetOwner(), m_Socket, stream);
GetOwner()->AddHandler (connection);
connection->I2PConnect ();
Done(shared_from_this());
}
else
{
LogPrint (eLogError, "I2PTunnel: Client Tunnel Issue when creating the stream, check the previous warnings for more info.");
Terminate();
}
}
void I2PClientTunnelHandler::Terminate()
{
if (Kill()) return;
if (m_Socket)
{
m_Socket->close();
m_Socket = nullptr;
}
Done(shared_from_this());
}
I2PClientTunnel::I2PClientTunnel (const std::string& destination, const std::string& address, int port, std::shared_ptr<ClientDestination> localDestination, int destinationPort):
TCPIPAcceptor (address, port, localDestination), m_Destination (destination), m_DestinationIdentHash (nullptr), m_DestinationPort (destinationPort) {}
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void I2PClientTunnel::Start ()
{
TCPIPAcceptor::Start ();
GetIdentHash();
}
void I2PClientTunnel::Stop ()
{
TCPIPAcceptor::Stop();
auto *originalIdentHash = m_DestinationIdentHash;
m_DestinationIdentHash = nullptr;
delete originalIdentHash;
}
/* HACK: maybe we should create a caching IdentHash provider in AddressBook */
const i2p::data::IdentHash * I2PClientTunnel::GetIdentHash ()
{
if (!m_DestinationIdentHash)
{
i2p::data::IdentHash identHash;
if (i2p::client::context.GetAddressBook ().GetIdentHash (m_Destination, identHash))
m_DestinationIdentHash = new i2p::data::IdentHash (identHash);
else
LogPrint (eLogWarning, "I2PTunnel: Remote destination ", m_Destination, " not found");
}
return m_DestinationIdentHash;
}
std::shared_ptr<I2PServiceHandler> I2PClientTunnel::CreateHandler(std::shared_ptr<boost::asio::ip::tcp::socket> socket)
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{
const i2p::data::IdentHash *identHash = GetIdentHash();
if (identHash)
return std::make_shared<I2PClientTunnelHandler>(this, *identHash, m_DestinationPort, socket);
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else
return nullptr;
}
I2PServerTunnel::I2PServerTunnel (const std::string& address, int port,
std::shared_ptr<ClientDestination> localDestination, int inport):
I2PService (localDestination), m_Address (address), m_Port (port), m_IsAccessList (false)
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{
m_PortDestination = localDestination->CreateStreamingDestination (inport > 0 ? inport : port);
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}
void I2PServerTunnel::Start ()
{
m_Endpoint.port (m_Port);
boost::system::error_code ec;
auto addr = boost::asio::ip::address::from_string (m_Address, ec);
if (!ec)
{
m_Endpoint.address (addr);
Accept ();
}
else
{
auto resolver = std::make_shared<boost::asio::ip::tcp::resolver>(GetService ());
resolver->async_resolve (boost::asio::ip::tcp::resolver::query (m_Address, ""),
std::bind (&I2PServerTunnel::HandleResolve, this,
std::placeholders::_1, std::placeholders::_2, resolver));
}
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}
void I2PServerTunnel::Stop ()
{
ClearHandlers ();
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}
void I2PServerTunnel::HandleResolve (const boost::system::error_code& ecode, boost::asio::ip::tcp::resolver::iterator it,
std::shared_ptr<boost::asio::ip::tcp::resolver> resolver)
{
if (!ecode)
{
auto addr = (*it).endpoint ().address ();
LogPrint (eLogInfo, "I2PTunnel: server tunnel ", (*it).host_name (), " has been resolved to ", addr);
m_Endpoint.address (addr);
Accept ();
}
else
LogPrint (eLogError, "I2PTunnel: Unable to resolve server tunnel address: ", ecode.message ());
}
void I2PServerTunnel::SetAccessList (const std::set<i2p::data::IdentHash>& accessList)
{
m_AccessList = accessList;
m_IsAccessList = true;
}
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void I2PServerTunnel::Accept ()
{
if (m_PortDestination)
m_PortDestination->SetAcceptor (std::bind (&I2PServerTunnel::HandleAccept, this, std::placeholders::_1));
auto localDestination = GetLocalDestination ();
if (localDestination)
{
if (!localDestination->IsAcceptingStreams ()) // set it as default if not set yet
localDestination->AcceptStreams (std::bind (&I2PServerTunnel::HandleAccept, this, std::placeholders::_1));
}
else
LogPrint (eLogError, "I2PTunnel: 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)
{
if (m_IsAccessList)
{
if (!m_AccessList.count (stream->GetRemoteIdentity ()->GetIdentHash ()))
{
LogPrint (eLogWarning, "I2PTunnel: Address ", stream->GetRemoteIdentity ()->GetIdentHash ().ToBase32 (), " is not in white list. Incoming connection dropped");
stream->Close ();
return;
}
}
CreateI2PConnection (stream);
}
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}
void I2PServerTunnel::CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream)
{
auto conn = std::make_shared<I2PTunnelConnection> (this, stream, std::make_shared<boost::asio::ip::tcp::socket> (GetService ()), GetEndpoint ());
AddHandler (conn);
conn->Connect ();
}
I2PServerTunnelHTTP::I2PServerTunnelHTTP (const std::string& address, int port, std::shared_ptr<ClientDestination> localDestination, int inport):
I2PServerTunnel (address, port, localDestination, inport)
{
}
void I2PServerTunnelHTTP::CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream)
{
auto conn = std::make_shared<I2PTunnelConnectionHTTP> (this, stream, std::make_shared<boost::asio::ip::tcp::socket> (GetService ()), GetEndpoint (), GetAddress ());
AddHandler (conn);
conn->Connect ();
}
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}
}