I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef SAM_H__
#define SAM_H__
#include <inttypes.h>
#include <string>
#include <map>
#include <list>
#include <thread>
#include <mutex>
#include <memory>
#include <boost/asio.hpp>
#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 = 20; // in seconds
const char SAM_HANDSHAKE[] = "HELLO VERSION";
const char SAM_HANDSHAKE_REPLY[] = "HELLO REPLY RESULT=OK VERSION=%s\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_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_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_CANT_REACH_PEER[] = "STREAM STATUS RESULT=CANT_REACH_PEER\n";
const char SAM_STREAM_STATUS_I2P_ERROR[] = "STREAM STATUS RESULT=I2P_ERROR\n";
const char SAM_STREAM_ACCEPT[] = "STREAM ACCEPT";
const char SAM_DATAGRAM_SEND[] = "DATAGRAM 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=ME VALUE=%s\n";
const char SAM_DATAGRAM_RECEIVED[] = "DATAGRAM RECEIVED DESTINATION=%s 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=INVALID_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_SIZE[] = "SIZE";
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_TRUE[] = "true";
const char SAM_VALUE_FALSE[] = "false";
const char SAM_VALUE_HOST[] = "HOST";
const char SAM_VALUE_PORT[] = "PORT";
enum SAMSocketType
{
eSAMSocketTypeUnknown,
eSAMSocketTypeSession,
eSAMSocketTypeStream,
eSAMSocketTypeAcceptor,
eSAMSocketTypeTerminated
};
class SAMBridge;
struct SAMSession;
class SAMSocket: public std::enable_shared_from_this<SAMSocket>
{
public:
SAMSocket (SAMBridge& owner);
~SAMSocket ();
void CloseStream (const char* reason); // TODO: implement it better
boost::asio::ip::tcp::socket& GetSocket () { return m_Socket; };
void ReceiveHandshake ();
void SetSocketType (SAMSocketType socketType) { m_SocketType = socketType; };
SAMSocketType GetSocketType () const { return m_SocketType; };
void Terminate ();
private:
void Terminate (const char* reason);
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 HandleWriteI2PData (const boost::system::error_code& ecode);
void HandleI2PDatagramReceive (const i2p::data::IdentityEx& from, 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 ProcessDestGenerate (char * buf, size_t len);
void ProcessNamingLookup (char * buf, size_t len);
void SendI2PError(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);
void HandleConnectLeaseSetRequestComplete (std::shared_ptr<i2p::data::LeaseSet> leaseSet);
void SendNamingLookupReply (std::shared_ptr<const i2p::data::IdentityEx> identity);
void HandleNamingLookupLeaseSetRequestComplete (std::shared_ptr<i2p::data::LeaseSet> leaseSet, i2p::data::IdentHash ident);
void HandleSessionReadinessCheckTimer (const boost::system::error_code& ecode);
void SendSessionCreateReplyOk ();
private:
SAMBridge& m_Owner;
boost::asio::ip::tcp::socket 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;
std::shared_ptr<SAMSession> m_Session;
};
struct SAMSession
{
std::shared_ptr<ClientDestination> localDestination;
std::list<std::shared_ptr<SAMSocket> > m_Sockets;
std::shared_ptr<boost::asio::ip::udp::endpoint> UDPEndpoint;
std::mutex m_SocketsMutex;
/** safely add a socket to this session */
void AddSocket(const std::shared_ptr<SAMSocket> & sock) {
std::lock_guard<std::mutex> lock(m_SocketsMutex);
m_Sockets.push_back(sock);
}
/** safely remove a socket from this session */
void DelSocket(const std::shared_ptr<SAMSocket> & sock) {
std::lock_guard<std::mutex> lock(m_SocketsMutex);
m_Sockets.remove(sock);
}
/** get a list holding a copy of all sam sockets from this session */
std::list<std::shared_ptr<SAMSocket> > ListSockets() {
std::list<std::shared_ptr<SAMSocket> > l;
{
std::lock_guard<std::mutex> lock(m_SocketsMutex);
for(const auto& sock : m_Sockets ) l.push_back(sock);
}
return l;
}
SAMSession (std::shared_ptr<ClientDestination> dest);
~SAMSession ();
void CloseStreams ();
};
class SAMBridge
{
public:
SAMBridge (const std::string& address, int port);
~SAMBridge ();
void Start ();
void Stop ();
boost::asio::io_service& GetService () { return m_Service; };
std::shared_ptr<SAMSession> CreateSession (const std::string& id, const std::string& destination, // empty string means transient
const std::map<std::string, std::string> * params);
void CloseSession (const std::string& id);
std::shared_ptr<SAMSession> FindSession (const std::string& id) const;
/** send raw data to remote endpoint from our UDP Socket */
void SendTo(const uint8_t * buf, size_t len, std::shared_ptr<boost::asio::ip::udp::endpoint> remote);
private:
void Run ();
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_IsRunning;
std::thread * m_Thread;
boost::asio::io_service m_Service;
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;
uint8_t m_DatagramReceiveBuffer[i2p::datagram::MAX_DATAGRAM_SIZE+1];
public:
// for HTTP
const decltype(m_Sessions)& GetSessions () const { return m_Sessions; };
};
}
}
#endif