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412 lines
13 KiB
C++
412 lines
13 KiB
C++
/*
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* Copyright (c) 2013-2021, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#ifndef I2PTUNNEL_H__
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#define I2PTUNNEL_H__
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#include <inttypes.h>
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#include <string>
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#include <set>
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#include <tuple>
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#include <memory>
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#include <sstream>
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#include <boost/asio.hpp>
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#include "Identity.h"
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#include "Destination.h"
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#include "Datagram.h"
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#include "Streaming.h"
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#include "I2PService.h"
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#include "AddressBook.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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const size_t I2P_TUNNEL_CONNECTION_BUFFER_SIZE = 65536;
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const int I2P_TUNNEL_CONNECTION_MAX_IDLE = 3600; // in seconds
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const int I2P_TUNNEL_DESTINATION_REQUEST_TIMEOUT = 10; // in seconds
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// for HTTP tunnels
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const char X_I2P_DEST_HASH[] = "X-I2P-DestHash"; // hash in base64
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const char X_I2P_DEST_B64[] = "X-I2P-DestB64"; // full address in base64
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const char X_I2P_DEST_B32[] = "X-I2P-DestB32"; // .b32.i2p address
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class I2PTunnelConnection: public I2PServiceHandler, public std::enable_shared_from_this<I2PTunnelConnection>
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{
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public:
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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 = 0); // to I2P
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I2PTunnelConnection (I2PService * owner, std::shared_ptr<boost::asio::ip::tcp::socket> socket,
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std::shared_ptr<i2p::stream::Stream> stream); // to I2P using simplified API
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I2PTunnelConnection (I2PService * owner, std::shared_ptr<i2p::stream::Stream> stream, std::shared_ptr<boost::asio::ip::tcp::socket> socket,
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const boost::asio::ip::tcp::endpoint& target, bool quiet = true); // from I2P
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~I2PTunnelConnection ();
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void I2PConnect (const uint8_t * msg = nullptr, size_t len = 0);
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void Connect (bool isUniqueLocal = true);
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void Connect (const boost::asio::ip::address& localAddress);
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protected:
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void Terminate ();
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void Receive ();
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void HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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virtual void Write (const uint8_t * buf, size_t len); // can be overloaded
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void HandleWrite (const boost::system::error_code& ecode);
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virtual void WriteToStream (const uint8_t * buf, size_t len); // can be overloaded
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void StreamReceive ();
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void HandleStreamReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandleConnect (const boost::system::error_code& ecode);
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std::shared_ptr<const boost::asio::ip::tcp::socket> GetSocket () const { return m_Socket; };
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private:
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uint8_t m_Buffer[I2P_TUNNEL_CONNECTION_BUFFER_SIZE], m_StreamBuffer[I2P_TUNNEL_CONNECTION_BUFFER_SIZE];
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std::shared_ptr<boost::asio::ip::tcp::socket> m_Socket;
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std::shared_ptr<i2p::stream::Stream> m_Stream;
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boost::asio::ip::tcp::endpoint m_RemoteEndpoint;
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bool m_IsQuiet; // don't send destination
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};
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class I2PClientTunnelConnectionHTTP: public I2PTunnelConnection
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{
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public:
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I2PClientTunnelConnectionHTTP (I2PService * owner, std::shared_ptr<boost::asio::ip::tcp::socket> socket,
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std::shared_ptr<i2p::stream::Stream> stream):
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I2PTunnelConnection (owner, socket, stream), m_HeaderSent (false),
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m_ConnectionSent (false), m_ProxyConnectionSent (false) {};
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protected:
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void Write (const uint8_t * buf, size_t len);
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private:
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std::stringstream m_InHeader, m_OutHeader;
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bool m_HeaderSent, m_ConnectionSent, m_ProxyConnectionSent;
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};
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class I2PServerTunnelConnectionHTTP: public I2PTunnelConnection
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{
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public:
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I2PServerTunnelConnectionHTTP (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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protected:
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void Write (const uint8_t * buf, size_t len);
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void WriteToStream (const uint8_t * buf, size_t len);
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private:
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std::string m_Host;
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std::stringstream m_InHeader, m_OutHeader;
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bool m_HeaderSent, m_ResponseHeaderSent;
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std::shared_ptr<const i2p::data::IdentityEx> m_From;
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};
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class I2PTunnelConnectionIRC: public I2PTunnelConnection
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{
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public:
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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& m_WebircPass);
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protected:
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void Write (const uint8_t * buf, size_t len);
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private:
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std::shared_ptr<const i2p::data::IdentityEx> m_From;
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std::stringstream m_OutPacket, m_InPacket;
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bool m_NeedsWebIrc;
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std::string m_WebircPass;
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};
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class I2PClientTunnel: public TCPIPAcceptor
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{
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protected:
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// Implements TCPIPAcceptor
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std::shared_ptr<I2PServiceHandler> CreateHandler(std::shared_ptr<boost::asio::ip::tcp::socket> socket);
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public:
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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 = 0);
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~I2PClientTunnel () {}
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void Start ();
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void Stop ();
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const char* GetName() { return m_Name.c_str (); }
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void SetKeepAliveInterval (uint32_t keepAliveInterval);
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private:
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std::shared_ptr<const Address> GetAddress ();
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void ScheduleKeepAliveTimer ();
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void HandleKeepAliveTimer (const boost::system::error_code& ecode);
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private:
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std::string m_Name, m_Destination;
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std::shared_ptr<const Address> m_Address;
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int m_DestinationPort;
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uint32_t m_KeepAliveInterval;
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std::unique_ptr<boost::asio::deadline_timer> m_KeepAliveTimer;
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};
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/** 2 minute timeout for udp sessions */
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const uint64_t I2P_UDP_SESSION_TIMEOUT = 1000 * 60 * 2;
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const uint64_t I2P_UDP_REPLIABLE_DATAGRAM_INTERVAL = 100; // in milliseconds
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/** max size for i2p udp */
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const size_t I2P_UDP_MAX_MTU = 64*1024;
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struct UDPSession
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{
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i2p::datagram::DatagramDestination * m_Destination;
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boost::asio::ip::udp::socket IPSocket;
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i2p::data::IdentHash Identity;
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boost::asio::ip::udp::endpoint FromEndpoint;
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boost::asio::ip::udp::endpoint SendEndpoint;
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uint64_t LastActivity;
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uint16_t LocalPort;
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uint16_t RemotePort;
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uint8_t m_Buffer[I2P_UDP_MAX_MTU];
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UDPSession(boost::asio::ip::udp::endpoint localEndpoint,
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const std::shared_ptr<i2p::client::ClientDestination> & localDestination,
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boost::asio::ip::udp::endpoint remote, const i2p::data::IdentHash * ident,
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uint16_t ourPort, uint16_t theirPort);
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void HandleReceived(const boost::system::error_code & ecode, std::size_t len);
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void Receive();
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};
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/** read only info about a datagram session */
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struct DatagramSessionInfo
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{
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/** the name of this forward */
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std::string Name;
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/** ident hash of local destination */
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std::shared_ptr<const i2p::data::IdentHash> LocalIdent;
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/** ident hash of remote destination */
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std::shared_ptr<const i2p::data::IdentHash> RemoteIdent;
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/** ident hash of IBGW in use currently in this session or nullptr if none is set */
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std::shared_ptr<const i2p::data::IdentHash> CurrentIBGW;
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/** ident hash of OBEP in use for this session or nullptr if none is set */
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std::shared_ptr<const i2p::data::IdentHash> CurrentOBEP;
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/** i2p router's udp endpoint */
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boost::asio::ip::udp::endpoint LocalEndpoint;
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/** client's udp endpoint */
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boost::asio::ip::udp::endpoint RemoteEndpoint;
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/** how long has this converstation been idle in ms */
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uint64_t idle;
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};
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typedef std::shared_ptr<UDPSession> UDPSessionPtr;
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/** server side udp tunnel, many i2p inbound to 1 ip outbound */
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class I2PUDPServerTunnel
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{
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public:
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I2PUDPServerTunnel (const std::string & name,
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std::shared_ptr<i2p::client::ClientDestination> localDestination,
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boost::asio::ip::address localAddress,
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boost::asio::ip::udp::endpoint forwardTo, uint16_t port, bool gzip);
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~I2PUDPServerTunnel ();
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/** expire stale udp conversations */
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void ExpireStale (const uint64_t delta=I2P_UDP_SESSION_TIMEOUT);
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void Start ();
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void Stop ();
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const char * GetName () const { return m_Name.c_str(); }
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std::vector<std::shared_ptr<DatagramSessionInfo> > GetSessions ();
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std::shared_ptr<ClientDestination> GetLocalDestination () const { return m_LocalDest; }
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void SetUniqueLocal (bool isUniqueLocal = true) { m_IsUniqueLocal = isUniqueLocal; }
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private:
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void HandleRecvFromI2P (const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len);
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void HandleRecvFromI2PRaw (uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len);
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UDPSessionPtr ObtainUDPSession (const i2p::data::IdentityEx& from, uint16_t localPort, uint16_t remotePort);
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private:
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bool m_IsUniqueLocal;
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const std::string m_Name;
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boost::asio::ip::address m_LocalAddress;
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boost::asio::ip::udp::endpoint m_RemoteEndpoint;
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std::mutex m_SessionsMutex;
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std::vector<UDPSessionPtr> m_Sessions;
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std::shared_ptr<i2p::client::ClientDestination> m_LocalDest;
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UDPSessionPtr m_LastSession;
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bool m_Gzip;
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public:
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bool isUpdated; // transient, used during reload only
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};
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class I2PUDPClientTunnel
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{
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public:
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I2PUDPClientTunnel (const std::string & name, const std::string &remoteDest,
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boost::asio::ip::udp::endpoint localEndpoint, std::shared_ptr<i2p::client::ClientDestination> localDestination,
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uint16_t remotePort, bool gzip);
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~I2PUDPClientTunnel ();
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void Start ();
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void Stop ();
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const char * GetName () const { return m_Name.c_str(); }
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std::vector<std::shared_ptr<DatagramSessionInfo> > GetSessions ();
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bool IsLocalDestination (const i2p::data::IdentHash & destination) const { return destination == m_LocalDest->GetIdentHash(); }
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std::shared_ptr<ClientDestination> GetLocalDestination () const { return m_LocalDest; }
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inline void SetLocalDestination (std::shared_ptr<ClientDestination> dest)
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{
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if (m_LocalDest) m_LocalDest->Release ();
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if (dest) dest->Acquire ();
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m_LocalDest = dest;
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}
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void ExpireStale (const uint64_t delta=I2P_UDP_SESSION_TIMEOUT);
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private:
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typedef std::pair<boost::asio::ip::udp::endpoint, uint64_t> UDPConvo;
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void RecvFromLocal ();
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void HandleRecvFromLocal (const boost::system::error_code & e, std::size_t transferred);
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void HandleRecvFromI2P (const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len);
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void HandleRecvFromI2PRaw (uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len);
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void TryResolving ();
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private:
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const std::string m_Name;
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std::mutex m_SessionsMutex;
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std::unordered_map<uint16_t, std::shared_ptr<UDPConvo> > m_Sessions; // maps i2p port -> local udp convo
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const std::string m_RemoteDest;
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std::shared_ptr<i2p::client::ClientDestination> m_LocalDest;
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const boost::asio::ip::udp::endpoint m_LocalEndpoint;
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i2p::data::IdentHash * m_RemoteIdent;
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std::thread * m_ResolveThread;
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std::unique_ptr<boost::asio::ip::udp::socket> m_LocalSocket;
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boost::asio::ip::udp::endpoint m_RecvEndpoint;
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uint8_t m_RecvBuff[I2P_UDP_MAX_MTU];
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uint16_t RemotePort, m_LastPort;
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bool m_cancel_resolve;
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bool m_Gzip;
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std::shared_ptr<UDPConvo> m_LastSession;
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public:
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bool isUpdated; // transient, used during reload only
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};
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class I2PServerTunnel: public I2PService
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{
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public:
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I2PServerTunnel (const std::string& name, const std::string& address, int port,
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std::shared_ptr<ClientDestination> localDestination, int inport = 0, bool gzip = true);
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void Start ();
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void Stop ();
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void SetAccessList (const std::set<i2p::data::IdentHash>& accessList);
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void SetUniqueLocal (bool isUniqueLocal) { m_IsUniqueLocal = isUniqueLocal; }
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bool IsUniqueLocal () const { return m_IsUniqueLocal; }
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void SetLocalAddress (const std::string& localAddress);
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const std::string& GetAddress() const { return m_Address; }
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int GetPort () const { return m_Port; };
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uint16_t GetLocalPort () const { return m_PortDestination->GetLocalPort (); };
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const boost::asio::ip::tcp::endpoint& GetEndpoint () const { return m_Endpoint; }
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const char* GetName() { return m_Name.c_str (); }
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private:
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void 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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void Accept ();
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void HandleAccept (std::shared_ptr<i2p::stream::Stream> stream);
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virtual std::shared_ptr<I2PTunnelConnection> CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream);
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private:
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bool m_IsUniqueLocal;
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std::string m_Name, m_Address;
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int m_Port;
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boost::asio::ip::tcp::endpoint m_Endpoint;
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std::shared_ptr<i2p::stream::StreamingDestination> m_PortDestination;
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std::set<i2p::data::IdentHash> m_AccessList;
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bool m_IsAccessList;
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std::unique_ptr<boost::asio::ip::address> m_LocalAddress;
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};
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class I2PServerTunnelHTTP: public I2PServerTunnel
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{
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public:
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I2PServerTunnelHTTP (const std::string& name, const std::string& address, int port,
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std::shared_ptr<ClientDestination> localDestination, const std::string& host,
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int inport = 0, bool gzip = true);
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private:
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std::shared_ptr<I2PTunnelConnection> CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream);
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private:
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std::string m_Host;
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};
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class I2PServerTunnelIRC: public I2PServerTunnel
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{
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public:
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I2PServerTunnelIRC (const std::string& name, const std::string& address, int port,
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std::shared_ptr<ClientDestination> localDestination, const std::string& webircpass,
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int inport = 0, bool gzip = true);
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private:
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std::shared_ptr<I2PTunnelConnection> CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream);
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private:
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std::string m_WebircPass;
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};
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}
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}
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#endif
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