mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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492 lines
15 KiB
492 lines
15 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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namespace i2p |
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{ |
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namespace client |
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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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void I2PTunnelConnection::Connect () |
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{ |
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if (m_Socket) |
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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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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->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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LogPrint (eLogError, "I2PTunnel: read 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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{ |
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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 |
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Terminate (); |
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} |
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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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memcpy (m_StreamBuffer, dest.c_str (), dest.size ()); |
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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 (line.find ("Host:") != std::string::npos) |
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m_OutHeader << "Host: " << m_Host << "\r\n"; |
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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& host): |
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I2PTunnelConnection (owner, stream, socket, target), m_Host (host), m_From (stream->GetRemoteIdentity ()) |
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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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std::string line; |
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m_OutPacket.str (""); |
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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::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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} |
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auto pos = line.find ("USER"); |
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if (pos != std::string::npos && pos == 0) |
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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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} else { |
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m_OutPacket << line << '\n'; |
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} |
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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): |
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I2PService (localDestination), 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); |
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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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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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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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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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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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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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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 (); |
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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): |
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I2PServerTunnel (name, address, port, localDestination, inport), |
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m_Host (host.length () > 0 ? host : address) |
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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); |
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conn->Connect (); |
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} |
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I2PServerTunnelIRC::I2PServerTunnelIRC (const std::string& name, const std::string& address, |
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int port, std::shared_ptr<ClientDestination> localDestination, int inport): |
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I2PServerTunnel (name, address, port, localDestination, inport) |
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{ |
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} |
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void I2PServerTunnelIRC::CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream) |
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{ |
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auto conn = std::make_shared<I2PTunnelConnectionIRC> (this, stream, std::make_shared<boost::asio::ip::tcp::socket> (GetService ()), GetEndpoint (), GetAddress ()); |
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AddHandler (conn); |
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conn->Connect (); |
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} |
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} |
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}
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