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I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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i2pd/libi2pd_client/SAM.h

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/*
* Copyright (c) 2013-2024, 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
*/
#ifndef SAM_H__
#define SAM_H__
#include <inttypes.h>
#include <string>
#include <map>
#include <list>
#include <set>
#include <thread>
#include <mutex>
#include <memory>
#include <boost/asio.hpp>
#include "util.h"
#include "Identity.h"
#include "LeaseSet.h"
#include "Streaming.h"
#include "Destination.h"
namespace i2p
{
namespace client
{
const size_t SAM_SOCKET_BUFFER_SIZE = 8192;
const int SAM_SOCKET_CONNECTION_MAX_IDLE = 3600; // in seconds
const int SAM_SESSION_READINESS_CHECK_INTERVAL = 3; // in seconds
const size_t SAM_SESSION_MAX_ACCEPT_QUEUE_SIZE = 50;
const size_t SAM_SESSION_MAX_ACCEPT_INTERVAL = 3; // in seconds
const char SAM_HANDSHAKE[] = "HELLO VERSION";
const char SAM_HANDSHAKE_REPLY[] = "HELLO REPLY RESULT=OK VERSION=%s\n";
const char SAM_HANDSHAKE_NOVERSION[] = "HELLO REPLY RESULT=NOVERSION\n";
const char SAM_HANDSHAKE_I2P_ERROR[] = "HELLO REPLY RESULT=I2P_ERROR\n";
const char SAM_SESSION_CREATE[] = "SESSION CREATE";
const char SAM_SESSION_CREATE_REPLY_OK[] = "SESSION STATUS RESULT=OK DESTINATION=%s\n";
const char SAM_SESSION_CREATE_DUPLICATED_ID[] = "SESSION STATUS RESULT=DUPLICATED_ID\n";
const char SAM_SESSION_CREATE_DUPLICATED_DEST[] = "SESSION STATUS RESULT=DUPLICATED_DEST\n";
const char SAM_SESSION_CREATE_INVALID_ID[] = "SESSION STATUS RESULT=INVALID_ID\n";
const char SAM_SESSION_STATUS_INVALID_KEY[] = "SESSION STATUS RESULT=INVALID_KEY\n";
const char SAM_SESSION_STATUS_I2P_ERROR[] = "SESSION STATUS RESULT=I2P_ERROR MESSAGE=\"%s\"\n";
const char SAM_SESSION_ADD[] = "SESSION ADD";
const char SAM_SESSION_REMOVE[] = "SESSION REMOVE";
const char SAM_STREAM_CONNECT[] = "STREAM CONNECT";
const char SAM_STREAM_STATUS_OK[] = "STREAM STATUS RESULT=OK\n";
const char SAM_STREAM_STATUS_INVALID_ID[] = "STREAM STATUS RESULT=INVALID_ID\n";
const char SAM_STREAM_STATUS_INVALID_KEY[] = "STREAM STATUS RESULT=INVALID_KEY\n";
const char SAM_STREAM_STATUS_CANT_REACH_PEER[] = "STREAM STATUS RESULT=CANT_REACH_PEER MESSAGE=\"%s\"\n";
const char SAM_STREAM_STATUS_I2P_ERROR[] = "STREAM STATUS RESULT=I2P_ERROR MESSAGE=\"%s\"\n";
const char SAM_STREAM_ACCEPT[] = "STREAM ACCEPT";
const char SAM_STREAM_FORWARD[] = "STREAM FORWARD";
const char SAM_DATAGRAM_SEND[] = "DATAGRAM SEND";
const char SAM_RAW_SEND[] = "RAW SEND";
const char SAM_DEST_GENERATE[] = "DEST GENERATE";
const char SAM_DEST_REPLY[] = "DEST REPLY PUB=%s PRIV=%s\n";
const char SAM_DEST_REPLY_I2P_ERROR[] = "DEST REPLY RESULT=I2P_ERROR\n";
const char SAM_NAMING_LOOKUP[] = "NAMING LOOKUP";
const char SAM_NAMING_REPLY[] = "NAMING REPLY RESULT=OK NAME=%s VALUE=%s\n";
const char SAM_DATAGRAM_RECEIVED[] = "DATAGRAM RECEIVED DESTINATION=%s SIZE=%lu\n";
const char SAM_RAW_RECEIVED[] = "RAW RECEIVED SIZE=%lu\n";
const char SAM_NAMING_REPLY_INVALID_KEY[] = "NAMING REPLY RESULT=INVALID_KEY NAME=%s\n";
const char SAM_NAMING_REPLY_KEY_NOT_FOUND[] = "NAMING REPLY RESULT=KEY_NOT_FOUND NAME=%s\n";
const char SAM_PARAM_MIN[] = "MIN";
const char SAM_PARAM_MAX[] = "MAX";
const char SAM_PARAM_STYLE[] = "STYLE";
const char SAM_PARAM_ID[] = "ID";
const char SAM_PARAM_SILENT[] = "SILENT";
const char SAM_PARAM_DESTINATION[] = "DESTINATION";
const char SAM_PARAM_NAME[] = "NAME";
const char SAM_PARAM_SIGNATURE_TYPE[] = "SIGNATURE_TYPE";
const char SAM_PARAM_CRYPTO_TYPE[] = "CRYPTO_TYPE";
const char SAM_PARAM_SIZE[] = "SIZE";
const char SAM_PARAM_HOST[] = "HOST";
const char SAM_PARAM_PORT[] = "PORT";
const char SAM_PARAM_FROM_PORT[] = "FROM_PORT";
const char SAM_VALUE_TRANSIENT[] = "TRANSIENT";
const char SAM_VALUE_STREAM[] = "STREAM";
const char SAM_VALUE_DATAGRAM[] = "DATAGRAM";
const char SAM_VALUE_RAW[] = "RAW";
const char SAM_VALUE_MASTER[] = "MASTER";
const char SAM_VALUE_TRUE[] = "true";
const char SAM_VALUE_FALSE[] = "false";
enum SAMSocketType
{
eSAMSocketTypeUnknown,
eSAMSocketTypeSession,
eSAMSocketTypeStream,
eSAMSocketTypeAcceptor,
eSAMSocketTypeForward,
eSAMSocketTypeTerminated
};
class SAMBridge;
struct SAMSession;
class SAMSocket: public std::enable_shared_from_this<SAMSocket>
{
public:
typedef boost::asio::ip::tcp::socket Socket_t;
SAMSocket (SAMBridge& owner);
~SAMSocket ();
Socket_t& GetSocket () { return m_Socket; };
void ReceiveHandshake ();
void SetSocketType (SAMSocketType socketType) { m_SocketType = socketType; };
SAMSocketType GetSocketType () const { return m_SocketType; };
void Terminate (const char* reason);
bool IsSession(const std::string & id) const;
private:
void TerminateClose() { Terminate(nullptr); }
void HandleHandshakeReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleHandshakeReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleMessage (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void SendMessageReply (const char * msg, size_t len, bool close);
void HandleMessageReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred, bool close);
void Receive ();
void HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void I2PReceive ();
void HandleI2PReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleI2PAccept (std::shared_ptr<i2p::stream::Stream> stream);
void HandleI2PForward (std::shared_ptr<i2p::stream::Stream> stream, boost::asio::ip::tcp::endpoint ep);
void HandleWriteI2PData (const boost::system::error_code& ecode, size_t sz);
void HandleI2PDatagramReceive (const i2p::data::IdentityEx& from, uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len);
void HandleI2PRawDatagramReceive (uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len);
void ProcessSessionCreate (char * buf, size_t len);
void ProcessStreamConnect (char * buf, size_t len, size_t rem);
void ProcessStreamAccept (char * buf, size_t len);
void ProcessStreamForward (char * buf, size_t len);
void ProcessDestGenerate (char * buf, size_t len);
void ProcessNamingLookup (char * buf, size_t len);
void ProcessSessionAdd (char * buf, size_t len);
void ProcessSessionRemove (char * buf, size_t len);
void SendReplyWithMessage (const char * reply, const std::string & msg);
void SendSessionI2PError(const std::string & msg);
void SendStreamI2PError(const std::string & msg);
void SendStreamCantReachPeer(const std::string & msg);
size_t ProcessDatagramSend (char * buf, size_t len, const char * data); // from SAM 1.0
void ExtractParams (char * buf, std::map<std::string, std::string>& params);
void Connect (std::shared_ptr<const i2p::data::LeaseSet> remote, std::shared_ptr<SAMSession> session = nullptr);
void HandleConnectLeaseSetRequestComplete (std::shared_ptr<i2p::data::LeaseSet> leaseSet);
void SendNamingLookupReply (const std::string& name, std::shared_ptr<const i2p::data::IdentityEx> identity);
void HandleNamingLookupLeaseSetRequestComplete (std::shared_ptr<i2p::data::LeaseSet> leaseSet, std::string name);
void HandleSessionReadinessCheckTimer (const boost::system::error_code& ecode);
void SendSessionCreateReplyOk ();
void WriteI2PData(size_t sz);
void WriteI2PDataImmediate(uint8_t * ptr, size_t sz);
void HandleWriteI2PDataImmediate(const boost::system::error_code & ec, uint8_t * buff);
void HandleStreamSend(const boost::system::error_code & ec);
private:
SAMBridge& m_Owner;
Socket_t m_Socket;
boost::asio::deadline_timer m_Timer;
char m_Buffer[SAM_SOCKET_BUFFER_SIZE + 1];
size_t m_BufferOffset;
uint8_t m_StreamBuffer[SAM_SOCKET_BUFFER_SIZE];
SAMSocketType m_SocketType;
std::string m_ID; // nickname
bool m_IsSilent;
bool m_IsAccepting; // for eSAMSocketTypeAcceptor only
std::shared_ptr<i2p::stream::Stream> m_Stream;
};
enum SAMSessionType
{
eSAMSessionTypeUnknown,
eSAMSessionTypeStream,
eSAMSessionTypeDatagram,
eSAMSessionTypeRaw,
eSAMSessionTypeMaster
};
struct SAMSession
{
SAMBridge & m_Bridge;
std::string Name;
SAMSessionType Type;
std::shared_ptr<boost::asio::ip::udp::endpoint> UDPEndpoint; // TODO: move
std::list<std::pair<std::shared_ptr<SAMSocket>, uint64_t> > acceptQueue; // socket, receive time in seconds
SAMSession (SAMBridge & parent, const std::string & name, SAMSessionType type);
virtual ~SAMSession () {};
virtual std::shared_ptr<ClientDestination> GetLocalDestination () = 0;
virtual void StopLocalDestination () = 0;
virtual void Close () { CloseStreams (); };
void CloseStreams ();
};
struct SAMSingleSession: public SAMSession
{
std::shared_ptr<ClientDestination> localDestination;
SAMSingleSession (SAMBridge & parent, const std::string & name, SAMSessionType type, std::shared_ptr<ClientDestination> dest);
~SAMSingleSession ();
std::shared_ptr<ClientDestination> GetLocalDestination () { return localDestination; };
void StopLocalDestination ();
};
struct SAMMasterSession: public SAMSingleSession
{
std::set<std::string> subsessions;
SAMMasterSession (SAMBridge & parent, const std::string & name, std::shared_ptr<ClientDestination> dest):
SAMSingleSession (parent, name, eSAMSessionTypeMaster, dest) {};
void Close ();
};
struct SAMSubSession: public SAMSession
{
std::shared_ptr<SAMMasterSession> masterSession;
uint16_t inPort;
SAMSubSession (std::shared_ptr<SAMMasterSession> master, const std::string& name, SAMSessionType type, uint16_t port);
// implements SAMSession
std::shared_ptr<ClientDestination> GetLocalDestination ();
void StopLocalDestination ();
};
class SAMBridge: private i2p::util::RunnableService
{
public:
SAMBridge (const std::string& address, uint16_t portTCP, uint16_t portUDP, bool singleThread);
~SAMBridge ();
void Start ();
void Stop ();
auto& GetService () { return GetIOService (); };
std::shared_ptr<SAMSession> CreateSession (const std::string& id, SAMSessionType type, const std::string& destination, // empty string means transient
const std::map<std::string, std::string> * params);
bool AddSession (std::shared_ptr<SAMSession> session);
void CloseSession (const std::string& id);
std::shared_ptr<SAMSession> FindSession (const std::string& id) const;
std::list<std::shared_ptr<SAMSocket> > ListSockets(const std::string & id) const;
/** send raw data to remote endpoint from our UDP Socket */
void SendTo (const std::vector<boost::asio::const_buffer>& bufs, const boost::asio::ip::udp::endpoint& ep);
void AddSocket(std::shared_ptr<SAMSocket> socket);
void RemoveSocket(const std::shared_ptr<SAMSocket> & socket);
bool ResolveSignatureType (const std::string& name, i2p::data::SigningKeyType& type) const;
private:
void Accept ();
void HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<SAMSocket> socket);
void ReceiveDatagram ();
void HandleReceivedDatagram (const boost::system::error_code& ecode, std::size_t bytes_transferred);
private:
bool m_IsSingleThread;
boost::asio::ip::tcp::acceptor m_Acceptor;
boost::asio::ip::udp::endpoint m_DatagramEndpoint, m_SenderEndpoint;
boost::asio::ip::udp::socket m_DatagramSocket;
mutable std::mutex m_SessionsMutex;
std::map<std::string, std::shared_ptr<SAMSession> > m_Sessions;
mutable std::mutex m_OpenSocketsMutex;
std::list<std::shared_ptr<SAMSocket> > m_OpenSockets;
uint8_t m_DatagramReceiveBuffer[i2p::datagram::MAX_DATAGRAM_SIZE+1];
std::map<std::string, i2p::data::SigningKeyType> m_SignatureTypes;
public:
// for HTTP
const decltype(m_Sessions)& GetSessions () const { return m_Sessions; };
};
}
}
#endif