I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef SOCKS4A_H__
#define SOCKS4A_H__
#include <climits>
#include <memory>
#include <boost/asio.hpp>
#include "Identity.h"
#include "Streaming.h"
#include "I2PTunnel.h"
namespace i2p
{
namespace proxy
{
const size_t socks_buffer_size = 8192;
class SOCKS4AServer;
class SOCKS4AHandler {
private:
enum state {
GET_VERSION,
SOCKS4A,
READY
};
enum parseState {
GET4A_COMMAND,
GET4A_PORT1,
GET4A_PORT2,
GET4A_IP1,
GET4A_IP2,
GET4A_IP3,
GET4A_IP4,
GET4A_IDENT,
GET4A_HOST,
DONE
};
void GotClientRequest(boost::system::error_code & ecode, std::string & host, uint16_t port);
std::size_t HandleData(uint8_t *sock_buff, std::size_t len);
std::size_t HandleVersion(uint8_t *sock_buff);
std::size_t HandleSOCKS4A(uint8_t *sock_buff, std::size_t len);
void HandleSockRecv(const boost::system::error_code & ecode, std::size_t bytes_transfered);
void Terminate();
void CloseSock();
void CloseStream();
void AsyncSockRead();
void SocksFailed();
void SentSocksFailed(const boost::system::error_code & ecode);
void SentConnectionSuccess(const boost::system::error_code & ecode);
void ConnectionSuccess();
void HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream);
uint8_t m_sock_buff[socks_buffer_size];
SOCKS4AServer * m_parent;
boost::asio::ip::tcp::socket * m_sock;
std::shared_ptr<i2p::stream::Stream> m_stream;
state m_state;
parseState m_pstate;
uint8_t m_command;
uint16_t m_port;
uint32_t m_ip;
std::string m_destination;
public:
SOCKS4AHandler(SOCKS4AServer * parent, boost::asio::ip::tcp::socket * sock) :
m_parent(parent), m_sock(sock), m_stream(nullptr), m_state(GET_VERSION)
{ AsyncSockRead(); m_destination.reserve(HOST_NAME_MAX+1); }
~SOCKS4AHandler() { CloseSock(); CloseStream(); }
};
class SOCKS4AServer: public i2p::client::I2PTunnel
{
public:
SOCKS4AServer(int port) : I2PTunnel(nullptr),
m_Acceptor (GetService (), boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), port)),
m_Timer (GetService ()) {};
~SOCKS4AServer() { Stop(); }
void Start ();
void Stop ();
private:
void Accept();
void HandleAccept(const boost::system::error_code& ecode, boost::asio::ip::tcp::socket * socket);
private:
boost::asio::ip::tcp::acceptor m_Acceptor;
boost::asio::deadline_timer m_Timer;
};
typedef SOCKS4AServer SOCKSProxy;
}
}
#endif