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 "Identity.h"
#include "Log.h"
#include "NetDb.h"
#include "SAM.h"
namespace i2p
{
namespace stream
{
SAMSocket::SAMSocket (SAMBridge& owner):
m_Owner (owner), m_Socket (m_Owner.GetService ()), m_SocketType (eSAMSocketTypeUnknown),
m_Stream (nullptr)
{
}
SAMSocket::~SAMSocket ()
{
if (m_Stream)
{
m_Stream->Close ();
DeleteStream (m_Stream);
}
}
void SAMSocket::Terminate ()
{
if (m_Stream)
{
m_Stream->Close ();
DeleteStream (m_Stream);
m_Stream = nullptr;
}
switch (m_SocketType)
{
case eSAMSocketTypeSession:
m_Owner.CloseSession (m_ID);
break;
case eSAMSocketTypeStream:
{
auto session = m_Owner.FindSession (m_ID);
if (session)
session->sockets.remove (this);
break;
}
case eSAMSocketTypeAcceptor:
{
auto session = m_Owner.FindSession (m_ID);
if (session)
{
session->sockets.remove (this);
session->localDestination->ResetAcceptor ();
}
break;
}
default:
;
}
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
{
m_Socket.async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE),
boost::bind(&SAMSocket::HandleMessage, this,
boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
}
}
void SAMSocket::SendMessageReply (const char * msg, size_t len, bool close)
{
boost::asio::async_write (m_Socket, boost::asio::buffer (msg, len), boost::asio::transfer_all (),
boost::bind(&SAMSocket::HandleMessageReplySent, this,
boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred, close));
}
void SAMSocket::HandleMessageReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred, bool close)
{
if (ecode)
{
LogPrint ("SAM reply send error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
else
{
if (close)
Terminate ();
else
Receive ();
}
}
void SAMSocket::HandleMessage (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
{
m_Buffer[bytes_transferred] = 0;
char * eol = strchr (m_Buffer, '\n');
if (eol)
{
*eol = 0;
if (!strcmp (m_Buffer, SAM_SESSION_CREATE))
ProcessSessionCreate (eol + 1, bytes_transferred - (eol - m_Buffer) - 1);
else if (!strcmp (m_Buffer, SAM_STREAM_CONNECT))
ProcessStreamConnect (eol + 1, bytes_transferred - (eol - m_Buffer) - 1);
else if (!strcmp (m_Buffer, SAM_STREAM_ACCEPT))
ProcessStreamAccept (eol + 1, bytes_transferred - (eol - m_Buffer) - 1);
else
{
LogPrint ("SAM unexpected message ", m_Buffer);
Terminate ();
}
}
else
{
LogPrint ("SAM malformed message");
Terminate ();
}
}
}
void SAMSocket::ProcessSessionCreate (char * buf, size_t len)
{
std::map<std::string, std::string> params;
ExtractParams (buf, len, params);
std::string& id = params[SAM_PARAM_ID];
std::string& destination = params[SAM_PARAM_DESTINATION];
m_ID = id;
auto session = m_Owner.CreateSession (id, destination == SAM_VALUE_TRANSIENT ? "" : destination);
if (session)
{
m_SocketType = eSAMSocketTypeSession;
memcpy (m_Buffer, SAM_SESSION_CREATE_REPLY_OK, sizeof (SAM_SESSION_CREATE_REPLY_OK));
uint8_t ident[1024];
size_t l = session->localDestination->GetPrivateKeys ().ToBuffer (ident, 1024);
size_t l1 = i2p::data::ByteStreamToBase64 (ident, l, m_Buffer + sizeof (SAM_SESSION_CREATE_REPLY_OK),
SAM_SOCKET_BUFFER_SIZE - sizeof (SAM_SESSION_CREATE_REPLY_OK));
SendMessageReply (m_Buffer, sizeof (SAM_SESSION_CREATE_REPLY_OK) + l1, false);
}
else
SendMessageReply (SAM_SESSION_CREATE_DUPLICATED_ID, sizeof(SAM_SESSION_CREATE_DUPLICATED_ID), true);
}
void SAMSocket::ProcessStreamConnect (char * buf, size_t len)
{
std::map<std::string, std::string> params;
ExtractParams (buf, len, params);
std::string& id = params[SAM_PARAM_ID];
std::string& destination = params[SAM_PARAM_DESTINATION];
m_ID = id;
auto session = m_Owner.FindSession (id);
if (session)
{
uint8_t ident[1024];
size_t l = i2p::data::Base64ToByteStream (destination.c_str (), destination.length (), ident, 1024);
i2p::data::IdentityEx dest;
dest.FromBuffer (ident, l);
auto leaseSet = i2p::data::netdb.FindLeaseSet (dest.GetIdentHash ());
if (leaseSet)
{
m_SocketType = eSAMSocketTypeStream;
session->sockets.push_back (this);
m_Stream = session->localDestination->CreateNewOutgoingStream (*leaseSet);
m_Stream->Send ((uint8_t *)m_Buffer, 0, 0); // connect
I2PReceive ();
SendMessageReply (SAM_STREAM_STATUS_OK, sizeof(SAM_STREAM_STATUS_OK), false);
}
else
{
i2p::data::netdb.Subscribe (dest.GetIdentHash ());
SendMessageReply (SAM_STREAM_STATUS_CANT_REACH_PEER, sizeof(SAM_STREAM_STATUS_CANT_REACH_PEER), true);
}
}
else
SendMessageReply (SAM_STREAM_STATUS_INVALID_ID, sizeof(SAM_STREAM_STATUS_INVALID_ID), true);
}
void SAMSocket::ProcessStreamAccept (char * buf, size_t len)
{
std::map<std::string, std::string> params;
ExtractParams (buf, len, params);
std::string& id = params[SAM_PARAM_ID];
m_ID = id;
auto session = m_Owner.FindSession (id);
if (session)
{
if (!session->localDestination->IsAcceptorSet ())
{
m_SocketType = eSAMSocketTypeAcceptor;
session->sockets.push_back (this);
session->localDestination->SetAcceptor (std::bind (&SAMSocket::HandleI2PAccept, this, std::placeholders::_1));
SendMessageReply (SAM_STREAM_STATUS_OK, sizeof(SAM_STREAM_STATUS_OK), false);
}
else
SendMessageReply (SAM_STREAM_STATUS_I2P_ERROR, sizeof(SAM_STREAM_STATUS_I2P_ERROR), true);
}
else
SendMessageReply (SAM_STREAM_STATUS_INVALID_ID, sizeof(SAM_STREAM_STATUS_INVALID_ID), true);
}
void SAMSocket::ExtractParams (char * buf, size_t len, std::map<std::string, std::string>& params)
{
while (char * eol = strchr (buf, '\n'))
{
*eol = 0;
char * value = strchr (buf, '=');
if (value)
{
*value = 0;
value++;
params[buf] = value;
}
buf = eol + 1;
}
}
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::I2PReceive ()
{
if (m_Stream)
m_Stream->AsyncReceive (boost::asio::buffer (m_StreamBuffer, SAM_SOCKET_BUFFER_SIZE),
boost::bind (&SAMSocket::HandleI2PReceive, this,
boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred),
SAM_SOCKET_CONNECTION_MAX_IDLE);
}
void SAMSocket::HandleI2PReceive (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::HandleWriteI2PData, this, boost::asio::placeholders::error));
}
}
void SAMSocket::HandleWriteI2PData (const boost::system::error_code& ecode)
{
if (ecode)
{
LogPrint ("SAM socket write error: ", ecode.message ());
if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
else
I2PReceive ();
}
void SAMSocket::HandleI2PAccept (i2p::stream::Stream * stream)
{
m_Stream = stream;
auto session = m_Owner.FindSession (m_ID);
if (session)
session->localDestination->ResetAcceptor ();
I2PReceive ();
}
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 ();
}
SAMSession * SAMBridge::CreateSession (const std::string& id, const std::string& destination)
{
if (m_Sessions.find (id) != m_Sessions.end ()) // session exists
return nullptr;
StreamingDestination * localDestination = nullptr;
if (destination != "")
{
uint8_t * buf = new uint8_t[destination.length ()];
size_t l = i2p::data::Base64ToByteStream (destination.c_str (), destination.length (), buf, destination.length ());
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 &m_Sessions[id];
}
return nullptr;
}
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);
}
}
SAMSession * SAMBridge::FindSession (const std::string& id)
{
auto it = m_Sessions.find (id);
if (it != m_Sessions.end ())
return &it->second;
return nullptr;
}
}
}