I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <string.h>
#include <boost/bind.hpp>
#include "base64.h"
#include "Log.h"
#include "SAM.h"
namespace i2p
{
namespace stream
{
SAMSocket::SAMSocket (SAMBridge& owner):
m_Owner (owner), m_Socket (m_Owner.GetService ()), m_Stream (nullptr)
{
}
SAMSocket::~SAMSocket ()
{
if (m_Stream)
{
m_Stream->Close ();
delete m_Stream;
}
}
void SAMSocket::Terminate ()
{
if (m_Stream)
{
m_Stream->Close ();
delete m_Stream;
m_Stream = nullptr;
}
delete this;
}
void SAMSocket::ReceiveHandshake ()
{
m_Socket.async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE),
boost::bind(&SAMSocket::HandleHandshakeReceived, this,
boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
}
void SAMSocket::HandleHandshakeReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint ("SAM handshake read error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
else
{
m_Buffer[bytes_transferred] = 0;
LogPrint ("SAM handshake ", m_Buffer);
if (!memcmp (m_Buffer, SAM_HANDSHAKE, sizeof (SAM_HANDSHAKE)))
{
// TODO: check version
boost::asio::async_write (m_Socket, boost::asio::buffer (SAM_HANDSHAKE_REPLY, sizeof (SAM_HANDSHAKE_REPLY)), boost::asio::transfer_all (),
boost::bind(&SAMSocket::HandleHandshakeReplySent, this,
boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
}
else
{
LogPrint ("SAM hannshake mismatch");
Terminate ();
}
}
}
void SAMSocket::HandleHandshakeReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint ("SAM handshake reply send error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
else
Receive ();
}
void SAMSocket::Receive ()
{
m_Socket.async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE),
boost::bind(&SAMSocket::HandleReceived, this,
boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
}
void SAMSocket::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint ("SAM read error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
else
{
if (m_Stream)
m_Stream->Send ((uint8_t *)m_Buffer, bytes_transferred, 0);
Receive ();
}
}
void SAMSocket::StreamReceive ()
{
if (m_Stream)
m_Stream->AsyncReceive (boost::asio::buffer (m_StreamBuffer, SAM_SOCKET_BUFFER_SIZE),
boost::bind (&SAMSocket::HandleStreamReceive, this,
boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred),
SAM_SOCKET_CONNECTION_MAX_IDLE);
}
void SAMSocket::HandleStreamReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint ("SAM stream read error: ", ecode.message ());
Terminate ();
}
else
{
boost::asio::async_write (m_Socket, boost::asio::buffer (m_StreamBuffer, bytes_transferred),
boost::bind (&SAMSocket::HandleWriteStreamData, this, boost::asio::placeholders::error));
}
}
void SAMSocket::HandleWriteStreamData (const boost::system::error_code& ecode)
{
if (ecode)
{
LogPrint ("SAM socket write error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
else
StreamReceive ();
}
SAMBridge::SAMBridge (int port):
m_IsRunning (false), m_Thread (nullptr),
m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), port)),
m_NewSocket (nullptr)
{
}
SAMBridge::~SAMBridge ()
{
Stop ();
delete m_NewSocket;
}
void SAMBridge::Start ()
{
Accept ();
m_Thread = new std::thread (std::bind (&SAMBridge::Run, this));
}
void SAMBridge::Stop ()
{
m_IsRunning = false;
m_Service.stop ();
if (m_Thread)
{
m_Thread->join ();
delete m_Thread;
m_Thread = nullptr;
}
}
void SAMBridge::Run ()
{
while (m_IsRunning)
{
try
{
m_Service.run ();
}
catch (std::exception& ex)
{
LogPrint ("SAM: ", ex.what ());
}
}
}
void SAMBridge::Accept ()
{
m_NewSocket = new SAMSocket (*this);
m_Acceptor.async_accept (m_NewSocket->GetSocket (), boost::bind (&SAMBridge::HandleAccept, this,
boost::asio::placeholders::error));
}
void SAMBridge::HandleAccept(const boost::system::error_code& ecode)
{
if (!ecode)
{
LogPrint ("New SAM connection from ", m_NewSocket->GetSocket ().remote_endpoint ());
m_NewSocket->ReceiveHandshake ();
}
else
{
delete m_NewSocket;
m_NewSocket = nullptr;
}
if (ecode != boost::asio::error::operation_aborted)
Accept ();
}
bool SAMBridge::CreateSession (const std::string& id, const char * destination, size_t len)
{
if (m_Sessions.find (id) != m_Sessions.end ()) // session exists
return false;
StreamingDestination * localDestination = nullptr;
if (destination)
{
uint8_t * buf = new uint8_t[len];
size_t l = i2p::data::Base64ToByteStream (destination, len, buf, len);
i2p::data::PrivateKeys keys;
keys.FromBuffer (buf, l);
delete[] buf;
localDestination = GetLocalDestination (keys);
}
else // transient
localDestination = CreateNewLocalDestination ();
if (localDestination)
{
SAMSession session;
session.localDestination = localDestination;
session.isTransient = !destination;
m_Sessions[id] = session;
return true;
}
return false;
}
void SAMBridge::CloseSession (const std::string& id)
{
auto it = m_Sessions.find (id);
if (it != m_Sessions.end ())
{
for (auto it1 : it->second.sockets)
delete it1;
it->second.sockets.clear ();
if (it->second.isTransient)
DeleteLocalDestination (it->second.localDestination);
m_Sessions.erase (it);
}
}
}
}