I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2020, 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
*/
#include "Destination.h"
#include "Identity.h"
#include "ClientContext.h"
#include "I2PService.h"
#include <boost/asio/error.hpp>
namespace i2p
{
namespace client
{
static const i2p::data::SigningKeyType I2P_SERVICE_DEFAULT_KEY_TYPE = i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519;
I2PService::I2PService (std::shared_ptr<ClientDestination> localDestination):
m_LocalDestination (localDestination ? localDestination :
i2p::client::context.CreateNewLocalDestination (false, I2P_SERVICE_DEFAULT_KEY_TYPE)),
m_ReadyTimer(m_LocalDestination->GetService()),
m_ReadyTimerTriggered(false),
m_ConnectTimeout(0),
isUpdated (true)
{
m_LocalDestination->Acquire ();
}
I2PService::I2PService (i2p::data::SigningKeyType kt):
m_LocalDestination (i2p::client::context.CreateNewLocalDestination (false, kt)),
m_ReadyTimer(m_LocalDestination->GetService()),
m_ConnectTimeout(0),
isUpdated (true)
{
m_LocalDestination->Acquire ();
}
I2PService::~I2PService ()
{
ClearHandlers ();
if (m_LocalDestination) m_LocalDestination->Release ();
}
void I2PService::ClearHandlers ()
{
if(m_ConnectTimeout)
m_ReadyTimer.cancel();
std::unique_lock<std::mutex> l(m_HandlersMutex);
for (auto it: m_Handlers)
it->Terminate ();
m_Handlers.clear();
}
void I2PService::SetConnectTimeout(uint32_t timeout)
{
m_ConnectTimeout = timeout;
}
void I2PService::AddReadyCallback(ReadyCallback cb)
{
uint32_t now = i2p::util::GetSecondsSinceEpoch();
uint32_t tm = (m_ConnectTimeout) ? now + m_ConnectTimeout : NEVER_TIMES_OUT;
LogPrint(eLogDebug, "I2PService::AddReadyCallback() ", tm, " ", now);
m_ReadyCallbacks.push_back({cb, tm});
if (!m_ReadyTimerTriggered) TriggerReadyCheckTimer();
}
void I2PService::TriggerReadyCheckTimer()
{
m_ReadyTimer.expires_from_now(boost::posix_time::seconds (1));
m_ReadyTimer.async_wait(std::bind(&I2PService::HandleReadyCheckTimer, shared_from_this (), std::placeholders::_1));
m_ReadyTimerTriggered = true;
}
void I2PService::HandleReadyCheckTimer(const boost::system::error_code &ec)
{
if(ec || m_LocalDestination->IsReady())
{
for(auto & itr : m_ReadyCallbacks)
itr.first(ec);
m_ReadyCallbacks.clear();
}
else if(!m_LocalDestination->IsReady())
{
// expire timed out requests
uint32_t now = i2p::util::GetSecondsSinceEpoch ();
auto itr = m_ReadyCallbacks.begin();
while(itr != m_ReadyCallbacks.end())
{
if(itr->second != NEVER_TIMES_OUT && now >= itr->second)
{
itr->first(boost::asio::error::timed_out);
itr = m_ReadyCallbacks.erase(itr);
}
else
++itr;
}
}
if(!ec && m_ReadyCallbacks.size())
TriggerReadyCheckTimer();
else
m_ReadyTimerTriggered = false;
}
void I2PService::CreateStream (StreamRequestComplete streamRequestComplete, const std::string& dest, int port) {
assert(streamRequestComplete);
auto address = i2p::client::context.GetAddressBook ().GetAddress (dest);
if (address)
CreateStream(streamRequestComplete, address, port);
else
{
LogPrint (eLogWarning, "I2PService: Remote destination not found: ", dest);
streamRequestComplete (nullptr);
}
}
void I2PService::CreateStream(StreamRequestComplete streamRequestComplete, std::shared_ptr<const Address> address, int port)
{
if(m_ConnectTimeout && !m_LocalDestination->IsReady())
{
AddReadyCallback([this, streamRequestComplete, address, port] (const boost::system::error_code & ec)
{
if(ec)
{
LogPrint(eLogWarning, "I2PService::CreateStream() ", ec.message());
streamRequestComplete(nullptr);
}
else
{
if (address->IsIdentHash ())
this->m_LocalDestination->CreateStream(streamRequestComplete, address->identHash, port);
else
this->m_LocalDestination->CreateStream (streamRequestComplete, address->blindedPublicKey, port);
}
});
}
else
{
if (address->IsIdentHash ())
m_LocalDestination->CreateStream (streamRequestComplete, address->identHash, port);
else
m_LocalDestination->CreateStream (streamRequestComplete, address->blindedPublicKey, port);
}
}
TCPIPPipe::TCPIPPipe(I2PService * owner, std::shared_ptr<boost::asio::ip::tcp::socket> upstream, std::shared_ptr<boost::asio::ip::tcp::socket> downstream) : I2PServiceHandler(owner), m_up(upstream), m_down(downstream)
{
boost::asio::socket_base::receive_buffer_size option(TCP_IP_PIPE_BUFFER_SIZE);
upstream->set_option(option);
downstream->set_option(option);
}
TCPIPPipe::~TCPIPPipe()
{
Terminate();
}
void TCPIPPipe::Start()
{
AsyncReceiveUpstream();
AsyncReceiveDownstream();
}
void TCPIPPipe::Terminate()
{
if(Kill()) return;
if (m_up)
{
if (m_up->is_open())
m_up->close();
m_up = nullptr;
}
if (m_down)
{
if (m_down->is_open())
m_down->close();
m_down = nullptr;
}
Done(shared_from_this());
}
void TCPIPPipe::AsyncReceiveUpstream()
{
if (m_up)
{
m_up->async_read_some(boost::asio::buffer(m_upstream_to_down_buf, TCP_IP_PIPE_BUFFER_SIZE),
std::bind(&TCPIPPipe::HandleUpstreamReceived, shared_from_this(),
std::placeholders::_1, std::placeholders::_2));
}
else
LogPrint(eLogError, "TCPIPPipe: upstream receive: no socket");
}
void TCPIPPipe::AsyncReceiveDownstream()
{
if (m_down) {
m_down->async_read_some(boost::asio::buffer(m_downstream_to_up_buf, TCP_IP_PIPE_BUFFER_SIZE),
std::bind(&TCPIPPipe::HandleDownstreamReceived, shared_from_this(),
std::placeholders::_1, std::placeholders::_2));
}
else
LogPrint(eLogError, "TCPIPPipe: downstream receive: no socket");
}
void TCPIPPipe::UpstreamWrite(size_t len)
{
if (m_up)
{
LogPrint(eLogDebug, "TCPIPPipe: upstream: ", (int) len, " bytes written");
boost::asio::async_write(*m_up, boost::asio::buffer(m_upstream_buf, len),
boost::asio::transfer_all(),
std::bind(&TCPIPPipe::HandleUpstreamWrite,
shared_from_this(),
std::placeholders::_1));
}
else
LogPrint(eLogError, "TCPIPPipe: upstream write: no socket");
}
void TCPIPPipe::DownstreamWrite(size_t len)
{
if (m_down)
{
LogPrint(eLogDebug, "TCPIPPipe: downstream: ", (int) len, " bytes written");
boost::asio::async_write(*m_down, boost::asio::buffer(m_downstream_buf, len),
boost::asio::transfer_all(),
std::bind(&TCPIPPipe::HandleDownstreamWrite,
shared_from_this(),
std::placeholders::_1));
}
else
LogPrint(eLogError, "TCPIPPipe: downstream write: no socket");
}
void TCPIPPipe::HandleDownstreamReceived(const boost::system::error_code & ecode, std::size_t bytes_transfered)
{
LogPrint(eLogDebug, "TCPIPPipe: downstream: ", (int) bytes_transfered, " bytes received");
if (ecode)
{
LogPrint(eLogError, "TCPIPPipe: downstream read error:" , ecode.message());
if (ecode != boost::asio::error::operation_aborted)
Terminate();
} else {
if (bytes_transfered > 0 )
memcpy(m_upstream_buf, m_downstream_to_up_buf, bytes_transfered);
UpstreamWrite(bytes_transfered);
}
}
void TCPIPPipe::HandleDownstreamWrite(const boost::system::error_code & ecode) {
if (ecode)
{
LogPrint(eLogError, "TCPIPPipe: downstream write error:" , ecode.message());
if (ecode != boost::asio::error::operation_aborted)
Terminate();
}
else
AsyncReceiveUpstream();
}
void TCPIPPipe::HandleUpstreamWrite(const boost::system::error_code & ecode) {
if (ecode)
{
LogPrint(eLogError, "TCPIPPipe: upstream write error:" , ecode.message());
if (ecode != boost::asio::error::operation_aborted)
Terminate();
}
else
AsyncReceiveDownstream();
}
void TCPIPPipe::HandleUpstreamReceived(const boost::system::error_code & ecode, std::size_t bytes_transfered)
{
LogPrint(eLogDebug, "TCPIPPipe: upstream ", (int)bytes_transfered, " bytes received");
if (ecode)
{
LogPrint(eLogError, "TCPIPPipe: upstream read error:" , ecode.message());
if (ecode != boost::asio::error::operation_aborted)
Terminate();
} else {
if (bytes_transfered > 0 )
memcpy(m_downstream_buf, m_upstream_to_down_buf, bytes_transfered);
DownstreamWrite(bytes_transfered);
}
}
void TCPIPAcceptor::Start ()
{
m_Acceptor.reset (new boost::asio::ip::tcp::acceptor (GetService (), m_LocalEndpoint));
// update the local end point in case port has been set zero and got updated now
m_LocalEndpoint = m_Acceptor->local_endpoint();
m_Acceptor->listen ();
Accept ();
}
void TCPIPAcceptor::Stop ()
{
if (m_Acceptor)
{
m_Acceptor->close();
m_Acceptor.reset (nullptr);
}
m_Timer.cancel ();
ClearHandlers();
}
void TCPIPAcceptor::Accept ()
{
auto newSocket = std::make_shared<boost::asio::ip::tcp::socket> (GetService ());
m_Acceptor->async_accept (*newSocket, std::bind (&TCPIPAcceptor::HandleAccept, this,
std::placeholders::_1, newSocket));
}
void TCPIPAcceptor::HandleAccept (const boost::system::error_code& ecode, std::shared_ptr<boost::asio::ip::tcp::socket> socket)
{
if (!ecode)
{
LogPrint(eLogDebug, "I2PService: ", GetName(), " accepted");
auto handler = CreateHandler(socket);
if (handler)
{
AddHandler(handler);
handler->Handle();
}
else
socket->close();
Accept();
}
else
{
if (ecode != boost::asio::error::operation_aborted)
LogPrint (eLogError, "I2PService: ", GetName(), " closing socket on accept because: ", ecode.message ());
}
}
}
}