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/*
* Copyright (c) 2013-2020, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#include <cassert>
#include "Base.h"
#include "Log.h"
#include "Destination.h"
#include "ClientContext.h"
#include "I2PTunnel.h"
#include "util.h"
namespace i2p
{
namespace client
{
/** set standard socket options */
static void I2PTunnelSetSocketOptions(std::shared_ptr<boost::asio::ip::tcp::socket> socket)
{
if (socket && socket->is_open())
{
boost::asio::socket_base::receive_buffer_size option(I2P_TUNNEL_CONNECTION_BUFFER_SIZE);
socket->set_option(option);
}
}
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)
{
m_Stream = GetOwner()->GetLocalDestination ()->CreateStream (leaseSet, port);
}
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)
{
}
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 ();
}
static boost::asio::ip::address GetLoopbackAddressFor(const i2p::data::IdentHash & addr)
{
boost::asio::ip::address_v4::bytes_type bytes;
const uint8_t * ident = addr;
bytes[0] = 127;
memcpy (bytes.data ()+1, ident, 3);
boost::asio::ip::address ourIP = boost::asio::ip::address_v4 (bytes);
return ourIP;
}
#ifdef __linux__
static void MapToLoopback(const std::shared_ptr<boost::asio::ip::tcp::socket> & sock, const i2p::data::IdentHash & addr)
{
// bind to 127.x.x.x address
// where x.x.x are first three bytes from ident
auto ourIP = GetLoopbackAddressFor(addr);
boost::system::error_code ec;
sock->bind (boost::asio::ip::tcp::endpoint (ourIP, 0), ec);
if (ec)
LogPrint (eLogError, "I2PTunnel: can't bind ourIP to ", ourIP.to_string (), ": ", ec.message ());
}
#endif
void I2PTunnelConnection::Connect (bool isUniqueLocal)
{
I2PTunnelSetSocketOptions(m_Socket);
if (m_Socket)
{
#ifdef __linux__
if (isUniqueLocal && m_RemoteEndpoint.address ().is_v4 () &&
m_RemoteEndpoint.address ().to_v4 ().to_bytes ()[0] == 127)
{
m_Socket->open (boost::asio::ip::tcp::v4 ());
auto ident = m_Stream->GetRemoteIdentity()->GetIdentHash();
MapToLoopback(m_Socket, ident);
}
#endif
m_Socket->async_connect (m_RemoteEndpoint, std::bind (&I2PTunnelConnection::HandleConnect,
shared_from_this (), std::placeholders::_1));
}
}
void I2PTunnelConnection::Connect (const boost::asio::ip::address& localAddress)
{
if (m_Socket)
{
if (m_RemoteEndpoint.address().is_v6 ())
m_Socket->open (boost::asio::ip::tcp::v6 ());
else
m_Socket->open (boost::asio::ip::tcp::v4 ());
boost::system::error_code ec;
m_Socket->bind (boost::asio::ip::tcp::endpoint (localAddress, 0), ec);
if (ec)
LogPrint (eLogError, "I2PTunnel: can't bind to ", localAddress.to_string (), ": ", ec.message ());
}
Connect (false);
}
void I2PTunnelConnection::Terminate ()
{
if (Kill()) return;
if (m_Stream)
{
m_Stream->Close ();
m_Stream.reset ();
}
boost::system::error_code ec;
m_Socket->shutdown(boost::asio::ip::tcp::socket::shutdown_send, ec); // avoid RST
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)
{
if (ecode != boost::asio::error::operation_aborted)
{
LogPrint (eLogError, "I2PTunnel: read error: ", ecode.message ());
Terminate ();
}
}
else
WriteToStream (m_Buffer, bytes_transferred);
}
void I2PTunnelConnection::WriteToStream (const uint8_t * buf, size_t len)
{
if (m_Stream)
{
auto s = shared_from_this ();
m_Stream->AsyncSend (buf, len,
[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)
{
if (m_Stream->GetStatus () == i2p::stream::eStreamStatusNew ||
m_Stream->GetStatus () == i2p::stream::eStreamStatusOpen) // regular
{
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);
}
else // closed by peer
{
// get remaning data
auto len = m_Stream->ReadSome (m_StreamBuffer, I2P_TUNNEL_CONNECTION_BUFFER_SIZE);
if (len > 0) // still some data
Write (m_StreamBuffer, len);
else // no more data
Terminate ();
}
}
}
void I2PTunnelConnection::HandleStreamReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
if (ecode != boost::asio::error::operation_aborted)
{
LogPrint (eLogError, "I2PTunnel: stream read error: ", ecode.message ());
if (bytes_transferred > 0)
Write (m_StreamBuffer, bytes_transferred); // postpone termination
else if (ecode == boost::asio::error::timed_out && m_Stream && m_Stream->IsOpen ())
StreamReceive ();
else
Terminate ();
}
else
Terminate ();
}
else
Write (m_StreamBuffer, bytes_transferred);
}
void I2PTunnelConnection::Write (const uint8_t * buf, size_t len)
{
boost::asio::async_write (*m_Socket, boost::asio::buffer (buf, len), boost::asio::transfer_all (),
std::bind (&I2PTunnelConnection::HandleWrite, shared_from_this (), std::placeholders::_1));
}
void I2PTunnelConnection::HandleConnect (const boost::system::error_code& ecode)
{
if (ecode)
{
LogPrint (eLogError, "I2PTunnel: connect error: ", ecode.message ());
Terminate ();
}
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";
if(sizeof(m_StreamBuffer) >= dest.size()) {
memcpy (m_StreamBuffer, dest.c_str (), dest.size ());
}
HandleStreamReceive (boost::system::error_code (), dest.size ());
}
Receive ();
}
}
void I2PClientTunnelConnectionHTTP::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 == "\r") endOfHeader = true;
else
{
if (!m_ConnectionSent && !line.compare(0, 10, "Connection"))
{
/* close connection, if not Connection: (U|u)pgrade (for websocket) */
auto x = line.find("pgrade");
if (x != std::string::npos && std::tolower(line[x - 1]) == 'u')
m_OutHeader << line << "\r\n";
else
m_OutHeader << "Connection: close\r\n";
m_ConnectionSent = true;
}
else if (!m_ProxyConnectionSent && !line.compare(0, 16, "Proxy-Connection"))
{
m_OutHeader << "Proxy-Connection: close\r\n";
m_ProxyConnectionSent = true;
}
else
m_OutHeader << line << "\n";
}
}
else
break;
}
if (endOfHeader)
{
if (!m_ConnectionSent) m_OutHeader << "Connection: close\r\n";
if (!m_ProxyConnectionSent) m_OutHeader << "Proxy-Connection: close\r\n";
m_OutHeader << "\r\n"; // end of header
m_OutHeader << m_InHeader.str ().substr (m_InHeader.tellg ()); // data right after header
m_InHeader.str ("");
m_HeaderSent = true;
I2PTunnelConnection::Write ((uint8_t *)m_OutHeader.str ().c_str (), m_OutHeader.str ().length ());
}
}
}
I2PServerTunnelConnectionHTTP::I2PServerTunnelConnectionHTTP (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_ResponseHeaderSent (false), m_From (stream->GetRemoteIdentity ())
{
}
void I2PServerTunnelConnectionHTTP::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 == "\r") endOfHeader = true;
else
{
if (m_Host.length () > 0 && !line.compare(0, 5, "Host:"))
m_OutHeader << "Host: " << m_Host << "\r\n"; // override host
else
m_OutHeader << line << "\n";
}
}
else
break;
}
if (endOfHeader)
{
// add X-I2P fields
if (m_From)
{
m_OutHeader << X_I2P_DEST_B32 << ": " << context.GetAddressBook ().ToAddress(m_From->GetIdentHash ()) << "\r\n";
m_OutHeader << X_I2P_DEST_HASH << ": " << m_From->GetIdentHash ().ToBase64 () << "\r\n";
m_OutHeader << X_I2P_DEST_B64 << ": " << m_From->ToBase64 () << "\r\n";
}
m_OutHeader << "\r\n"; // end of header
m_OutHeader << m_InHeader.str ().substr (m_InHeader.tellg ()); // data right after header
m_InHeader.str ("");
m_From = nullptr;
m_HeaderSent = true;
I2PTunnelConnection::Write ((uint8_t *)m_OutHeader.str ().c_str (), m_OutHeader.str ().length ());
}
}
}
void I2PServerTunnelConnectionHTTP::WriteToStream (const uint8_t * buf, size_t len)
{
if (m_ResponseHeaderSent)
I2PTunnelConnection::WriteToStream (buf, len);
else
{
m_InHeader.clear ();
if (m_InHeader.str ().empty ()) m_OutHeader.str (""); // start of response
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 == "\r") endOfHeader = true;
else
{
static const std::vector<std::string> excluded // list of excluded headers
{
"Server:", "Date:", "X-Runtime:", "X-Powered-By:", "Proxy"
};
bool matched = false;
for (const auto& it: excluded)
if (!line.compare(0, it.length (), it))
{
matched = true;
break;
}
if (!matched)
m_OutHeader << line << "\n";
}
}
else
break;
}
if (endOfHeader)
{
m_OutHeader << "\r\n"; // end of header
m_OutHeader << m_InHeader.str ().substr (m_InHeader.tellg ()); // data right after header
m_InHeader.str ("");
m_ResponseHeaderSent = true;
I2PTunnelConnection::WriteToStream ((uint8_t *)m_OutHeader.str ().c_str (), m_OutHeader.str ().length ());
m_OutHeader.str ("");
}
else
Receive ();
}
}
I2PTunnelConnectionIRC::I2PTunnelConnectionIRC (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& webircpass):
I2PTunnelConnection (owner, stream, socket, target), m_From (stream->GetRemoteIdentity ()),
m_NeedsWebIrc (webircpass.length() ? true : false), m_WebircPass (webircpass)
{
}
void I2PTunnelConnectionIRC::Write (const uint8_t * buf, size_t len)
{
m_OutPacket.str ("");
if (m_NeedsWebIrc)
{
m_NeedsWebIrc = false;
m_OutPacket << "WEBIRC " << m_WebircPass << " cgiirc " << context.GetAddressBook ().ToAddress (m_From->GetIdentHash ()) << " " << GetSocket ()->local_endpoint ().address () << std::endl;
}
m_InPacket.clear ();
m_InPacket.write ((const char *)buf, len);
while (!m_InPacket.eof () && !m_InPacket.fail ())
{
std::string line;
std::getline (m_InPacket, line);
if (line.length () == 0 && m_InPacket.eof ())
m_InPacket.str ("");
auto pos = line.find ("USER");
if (!pos) // start of line
{
pos = line.find (" ");
pos++;
pos = line.find (" ", pos);
pos++;
auto nextpos = line.find (" ", pos);
m_OutPacket << line.substr (0, pos);
m_OutPacket << context.GetAddressBook ().ToAddress (m_From->GetIdentHash ());
m_OutPacket << line.substr (nextpos) << '\n';
}
else
m_OutPacket << line << '\n';
}
I2PTunnelConnection::Write ((uint8_t *)m_OutPacket.str ().c_str (), m_OutPacket.str ().length ());
}
/* This handler tries to establish 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, std::shared_ptr<const Address> address,
int destinationPort, std::shared_ptr<boost::asio::ip::tcp::socket> socket):
I2PServiceHandler(parent), m_Address(address),
m_DestinationPort (destinationPort), m_Socket(socket) {};
void Handle();
void Terminate();
private:
void HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream);
std::shared_ptr<const Address> m_Address;
int m_DestinationPort;
std::shared_ptr<boost::asio::ip::tcp::socket> m_Socket;
};
void I2PClientTunnelHandler::Handle()
{
GetOwner()->CreateStream (
std::bind (&I2PClientTunnelHandler::HandleStreamRequestComplete, shared_from_this(), std::placeholders::_1),
m_Address, 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& name, const std::string& destination,
const std::string& address, int port, std::shared_ptr<ClientDestination> localDestination, int destinationPort):
TCPIPAcceptor (address, port, localDestination), m_Name (name), m_Destination (destination),
m_DestinationPort (destinationPort)
{
}
void I2PClientTunnel::Start ()
{
TCPIPAcceptor::Start ();
GetAddress ();
}
void I2PClientTunnel::Stop ()
{
TCPIPAcceptor::Stop();
m_Address = nullptr;
}
/* HACK: maybe we should create a caching IdentHash provider in AddressBook */
std::shared_ptr<const Address> I2PClientTunnel::GetAddress ()
{
if (!m_Address)
{
m_Address = i2p::client::context.GetAddressBook ().GetAddress (m_Destination);
if (!m_Address)
LogPrint (eLogWarning, "I2PTunnel: Remote destination ", m_Destination, " not found");
}
return m_Address;
}
std::shared_ptr<I2PServiceHandler> I2PClientTunnel::CreateHandler(std::shared_ptr<boost::asio::ip::tcp::socket> socket)
{
auto address = GetAddress ();
if (address)
return std::make_shared<I2PClientTunnelHandler>(this, address, m_DestinationPort, socket);
else
return nullptr;
}
I2PServerTunnel::I2PServerTunnel (const std::string& name, const std::string& address,
int port, std::shared_ptr<ClientDestination> localDestination, int inport, bool gzip):
I2PService (localDestination), m_IsUniqueLocal(true), m_Name (name), m_Address (address), m_Port (port), m_IsAccessList (false)
{
m_PortDestination = localDestination->CreateStreamingDestination (inport > 0 ? inport : port, gzip);
}
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));
}
}
void I2PServerTunnel::Stop ()
{
ClearHandlers ();
}
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)
{
bool found = false;
boost::asio::ip::tcp::endpoint ep;
if (m_LocalAddress)
{
boost::asio::ip::tcp::resolver::iterator end;
while (it != end)
{
ep = *it;
if (!ep.address ().is_unspecified ())
{
if (ep.address ().is_v4 ())
{
if (m_LocalAddress->is_v4 ()) found = true;
}
else if (ep.address ().is_v6 ())
{
if (i2p::util::net::IsYggdrasilAddress (ep.address ()))
{
if (i2p::util::net::IsYggdrasilAddress (*m_LocalAddress))
found = true;
}
else if (m_LocalAddress->is_v6 ())
found = true;
}
}
if (found) break;
it++;
}
}
else
{
found = true;
ep = *it; // first available
}
if (!found)
{
LogPrint (eLogError, "I2PTunnel: Unable to resolve to compatible address");
return;
}
auto addr = ep.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;
}
void I2PServerTunnel::SetLocalAddress (const std::string& localAddress)
{
boost::system::error_code ec;
auto addr = boost::asio::ip::address::from_string(localAddress, ec);
if (!ec)
m_LocalAddress.reset (new boost::asio::ip::address (addr));
else
LogPrint (eLogError, "I2PTunnel: can't set local address ", localAddress);
}
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");
}
void I2PServerTunnel::HandleAccept (std::shared_ptr<i2p::stream::Stream> stream)
{
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;
}
}
// new connection
auto conn = CreateI2PConnection (stream);
AddHandler (conn);
if (m_LocalAddress)
conn->Connect (*m_LocalAddress);
else
conn->Connect (m_IsUniqueLocal);
}
}
std::shared_ptr<I2PTunnelConnection> I2PServerTunnel::CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream)
{
return std::make_shared<I2PTunnelConnection> (this, stream, std::make_shared<boost::asio::ip::tcp::socket> (GetService ()), GetEndpoint ());
}
I2PServerTunnelHTTP::I2PServerTunnelHTTP (const std::string& name, const std::string& address,
int port, std::shared_ptr<ClientDestination> localDestination,
const std::string& host, int inport, bool gzip):
I2PServerTunnel (name, address, port, localDestination, inport, gzip),
m_Host (host)
{
}
std::shared_ptr<I2PTunnelConnection> I2PServerTunnelHTTP::CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream)
{
return std::make_shared<I2PServerTunnelConnectionHTTP> (this, stream,
std::make_shared<boost::asio::ip::tcp::socket> (GetService ()), GetEndpoint (), m_Host);
}
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)
{
}
std::shared_ptr<I2PTunnelConnection> I2PServerTunnelIRC::CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream)
{
return std::make_shared<I2PTunnelConnectionIRC> (this, stream, std::make_shared<boost::asio::ip::tcp::socket> (GetService ()), GetEndpoint (), this->m_WebircPass);
}
void I2PUDPServerTunnel::HandleRecvFromI2P(const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len)
{
if (!m_LastSession || m_LastSession->Identity.GetLL()[0] != from.GetIdentHash ().GetLL()[0] || fromPort != m_LastSession->RemotePort)
{
std::lock_guard<std::mutex> lock(m_SessionsMutex);
m_LastSession = ObtainUDPSession(from, toPort, fromPort);
}
m_LastSession->IPSocket.send_to(boost::asio::buffer(buf, len), m_RemoteEndpoint);
m_LastSession->LastActivity = i2p::util::GetMillisecondsSinceEpoch();
}
void I2PUDPServerTunnel::HandleRecvFromI2PRaw (uint16_t, uint16_t, const uint8_t * buf, size_t len)
{
if (m_LastSession)
{
m_LastSession->IPSocket.send_to(boost::asio::buffer(buf, len), m_RemoteEndpoint);
m_LastSession->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.GetLL()[0] == ih.GetLL()[0] && remotePort == s->RemotePort)
{
/** 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_IsUniqueLocal && m_LocalAddress.is_loopback())
{
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)
{
IPSocket.set_option (boost::asio::socket_base::receive_buffer_size (I2P_UDP_MAX_MTU ));
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);
auto ts = i2p::util::GetMillisecondsSinceEpoch();
auto session = m_Destination->GetSession (Identity);
if (ts > LastActivity + I2P_UDP_REPLIABLE_DATAGRAM_INTERVAL)
m_Destination->SendDatagram(session, m_Buffer, len, LocalPort, RemotePort);
else
m_Destination->SendRawDatagram(session, m_Buffer, len, LocalPort, RemotePort);
size_t numPackets = 0;
while (numPackets < i2p::datagram::DATAGRAM_SEND_QUEUE_MAX_SIZE)
{
boost::system::error_code ec;
size_t moreBytes = IPSocket.available(ec);
if (ec || !moreBytes) break;
len = IPSocket.receive_from (boost::asio::buffer (m_Buffer, I2P_UDP_MAX_MTU), FromEndpoint, 0, ec);
m_Destination->SendRawDatagram (session, m_Buffer, len, LocalPort, RemotePort);
numPackets++;
}
if (numPackets > 0)
LogPrint(eLogDebug, "UDPSession: forward more ", numPackets, "packets B from ", FromEndpoint);
m_Destination->FlushSendQueue (session);
LastActivity = ts;
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, bool gzip) :
m_IsUniqueLocal(true),
m_Name(name),
m_LocalAddress(localAddress),
m_RemoteEndpoint(forwardTo)
{
m_LocalDest = localDestination;
m_LocalDest->Start();
auto dgram = m_LocalDest->CreateDatagramDestination(gzip);
dgram->SetReceiver(std::bind(&I2PUDPServerTunnel::HandleRecvFromI2P, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5));
dgram->SetRawReceiver(std::bind(&I2PUDPServerTunnel::HandleRecvFromI2PRaw, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4));
}
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, bool gzip) :
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_LastPort (0),
m_cancel_resolve(false)
{
m_LocalSocket.set_option (boost::asio::socket_base::receive_buffer_size (I2P_UDP_MAX_MTU ));
auto dgram = m_LocalDest->CreateDatagramDestination(gzip);
dgram->SetReceiver(std::bind(&I2PUDPClientTunnel::HandleRecvFromI2P, this,
std::placeholders::_1, std::placeholders::_2,
std::placeholders::_3, std::placeholders::_4,
std::placeholders::_5));
dgram->SetRawReceiver(std::bind(&I2PUDPClientTunnel::HandleRecvFromI2PRaw, this,
std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4));
}
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();
if (!m_LastPort || m_LastPort != remotePort)
{
auto itr = m_Sessions.find(remotePort);
if (itr != m_Sessions.end())
m_LastSession = itr->second;
else
{
m_LastSession = std::make_shared<UDPConvo>(boost::asio::ip::udp::endpoint(m_RecvEndpoint), 0);
m_Sessions.emplace (remotePort, m_LastSession);
}
m_LastPort = remotePort;
}
// send off to remote i2p destination
auto ts = i2p::util::GetMillisecondsSinceEpoch();
LogPrint(eLogDebug, "UDP Client: send ", transferred, " to ", m_RemoteIdent->ToBase32(), ":", RemotePort);
auto session = m_LocalDest->GetDatagramDestination()->GetSession (*m_RemoteIdent);
if (ts > m_LastSession->second + I2P_UDP_REPLIABLE_DATAGRAM_INTERVAL)
m_LocalDest->GetDatagramDestination()->SendDatagram (session, m_RecvBuff, transferred, remotePort, RemotePort);
else
m_LocalDest->GetDatagramDestination()->SendRawDatagram (session, m_RecvBuff, transferred, remotePort, RemotePort);
size_t numPackets = 0;
while (numPackets < i2p::datagram::DATAGRAM_SEND_QUEUE_MAX_SIZE)
{
boost::system::error_code ec;
size_t moreBytes = m_LocalSocket.available(ec);
if (ec || !moreBytes) break;
transferred = m_LocalSocket.receive_from (boost::asio::buffer (m_RecvBuff, I2P_UDP_MAX_MTU), m_RecvEndpoint, 0, ec);
remotePort = m_RecvEndpoint.port();
// TODO: check remotePort
m_LocalDest->GetDatagramDestination()->SendRawDatagram (session, m_RecvBuff, transferred, remotePort, RemotePort);
numPackets++;
}
if (numPackets)
LogPrint(eLogDebug, "UDP Client: sent ", numPackets, " more packets to ", m_RemoteIdent->ToBase32());
m_LocalDest->GetDatagramDestination()->FlushSendQueue (session);
// mark convo as active
if (m_LastSession)
m_LastSession->second = ts;
RecvFromLocal();
}
std::vector<std::shared_ptr<DatagramSessionInfo> > I2PUDPClientTunnel::GetSessions()
{
// TODO: implement
std::vector<std::shared_ptr<DatagramSessionInfo> > infos;
return infos;
}
void I2PUDPClientTunnel::TryResolving() {
i2p::util::SetThreadName("UDP Resolver");
LogPrint(eLogInfo, "UDP Tunnel: Trying to resolve ", m_RemoteDest);
std::shared_ptr<const Address> addr;
while(!(addr = context.GetAddressBook().GetAddress(m_RemoteDest)) && !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;
}
if (!addr || !addr->IsIdentHash ())
{
LogPrint(eLogError, "UDP Tunnel: ", m_RemoteDest, " not found");
return;
}
m_RemoteIdent = new i2p::data::IdentHash;
*m_RemoteIdent = addr->identHash;
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)
HandleRecvFromI2PRaw (fromPort, toPort, buf, len);
else
LogPrint(eLogWarning, "UDP Client: unwarranted traffic from ", from.GetIdentHash().ToBase32());
}
void I2PUDPClientTunnel::HandleRecvFromI2PRaw(uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len)
{
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 ", m_RemoteIdent ? m_RemoteIdent->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);
}
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;
}
}
}