I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <algorithm>
#include <cassert>
#include <boost/lexical_cast.hpp>
#include "Log.h"
#include "util.h"
#include "ElGamal.h"
#include "Timestamp.h"
#include "NetDb.h"
#include "AddressBook.h"
#include "Destination.h"
namespace i2p
{
namespace client
{
ClientDestination::ClientDestination (const i2p::data::PrivateKeys& keys, bool isPublic,
const std::map<std::string, std::string> * params):
m_IsRunning (false), m_Thread (nullptr), m_Work (m_Service),
m_Keys (keys), m_IsPublic (isPublic), m_PublishReplyToken (0),
m_DatagramDestination (nullptr), m_PublishConfirmationTimer (m_Service), m_CleanupTimer (m_Service)
{
i2p::crypto::GenerateElGamalKeyPair(i2p::context.GetRandomNumberGenerator (), m_EncryptionPrivateKey, m_EncryptionPublicKey);
int inboundTunnelLen = DEFAULT_INBOUND_TUNNEL_LENGTH;
int outboundTunnelLen = DEFAULT_OUTBOUND_TUNNEL_LENGTH;
int inboundTunnelsQuantity = DEFAULT_INBOUND_TUNNELS_QUANTITY;
int outboundTunnelsQuantity = DEFAULT_OUTBOUND_TUNNELS_QUANTITY;
std::shared_ptr<std::vector<i2p::data::IdentHash> > explicitPeers;
if (params)
{
auto it = params->find (I2CP_PARAM_INBOUND_TUNNEL_LENGTH);
if (it != params->end ())
{
int len = boost::lexical_cast<int>(it->second);
if (len > 0)
{
inboundTunnelLen = len;
LogPrint (eLogInfo, "Inbound tunnel length set to ", len);
}
}
it = params->find (I2CP_PARAM_OUTBOUND_TUNNEL_LENGTH);
if (it != params->end ())
{
int len = boost::lexical_cast<int>(it->second);
if (len > 0)
{
outboundTunnelLen = len;
LogPrint (eLogInfo, "Outbound tunnel length set to ", len);
}
}
it = params->find (I2CP_PARAM_INBOUND_TUNNELS_QUANTITY);
if (it != params->end ())
{
int quantity = boost::lexical_cast<int>(it->second);
if (quantity > 0)
{
inboundTunnelsQuantity = quantity;
LogPrint (eLogInfo, "Inbound tunnels quantity set to ", quantity);
}
}
it = params->find (I2CP_PARAM_OUTBOUND_TUNNELS_QUANTITY);
if (it != params->end ())
{
int quantity = boost::lexical_cast<int>(it->second);
if (quantity > 0)
{
outboundTunnelsQuantity = quantity;
LogPrint (eLogInfo, "Outbound tunnels quantity set to ", quantity);
}
}
it = params->find (I2CP_PARAM_EXPLICIT_PEERS);
if (it != params->end ())
{
explicitPeers = std::make_shared<std::vector<i2p::data::IdentHash> >();
std::stringstream ss(it->second);
std::string b64;
while (std::getline (ss, b64, ','))
{
i2p::data::IdentHash ident;
ident.FromBase64 (b64);
explicitPeers->push_back (ident);
}
LogPrint (eLogInfo, "Explicit peers set to ", it->second);
}
}
m_Pool = i2p::tunnel::tunnels.CreateTunnelPool (this, inboundTunnelLen, outboundTunnelLen, inboundTunnelsQuantity, outboundTunnelsQuantity);
if (explicitPeers)
m_Pool->SetExplicitPeers (explicitPeers);
if (m_IsPublic)
LogPrint (eLogInfo, "Local address ", i2p::client::GetB32Address(GetIdentHash()), " created");
m_StreamingDestination = std::make_shared<i2p::stream::StreamingDestination> (*this); // TODO:
}
ClientDestination::~ClientDestination ()
{
if (m_IsRunning)
Stop ();
for (auto it: m_LeaseSetRequests)
delete it.second;
if (m_Pool)
i2p::tunnel::tunnels.DeleteTunnelPool (m_Pool);
if (m_DatagramDestination)
delete m_DatagramDestination;
}
void ClientDestination::Run ()
{
while (m_IsRunning)
{
try
{
m_Service.run ();
}
catch (std::exception& ex)
{
LogPrint ("Destination: ", ex.what ());
}
}
}
void ClientDestination::Start ()
{
if (!m_IsRunning)
{
m_IsRunning = true;
m_Pool->SetLocalDestination (this);
m_Pool->SetActive (true);
m_Thread = new std::thread (std::bind (&ClientDestination::Run, this));
m_StreamingDestination->Start ();
for (auto it: m_StreamingDestinationsByPorts)
it.second->Start ();
m_CleanupTimer.expires_from_now (boost::posix_time::minutes (DESTINATION_CLEANUP_TIMEOUT));
m_CleanupTimer.async_wait (std::bind (&ClientDestination::HandleCleanupTimer,
this, std::placeholders::_1));
}
}
void ClientDestination::Stop ()
{
if (m_IsRunning)
{
m_CleanupTimer.cancel ();
m_IsRunning = false;
m_StreamingDestination->Stop ();
for (auto it: m_StreamingDestinationsByPorts)
it.second->Stop ();
if (m_DatagramDestination)
{
auto d = m_DatagramDestination;
m_DatagramDestination = nullptr;
delete d;
}
if (m_Pool)
{
m_Pool->SetLocalDestination (nullptr);
i2p::tunnel::tunnels.StopTunnelPool (m_Pool);
}
m_Service.stop ();
if (m_Thread)
{
m_Thread->join ();
delete m_Thread;
m_Thread = 0;
}
}
}
std::shared_ptr<const i2p::data::LeaseSet> ClientDestination::FindLeaseSet (const i2p::data::IdentHash& ident)
{
auto it = m_RemoteLeaseSets.find (ident);
if (it != m_RemoteLeaseSets.end ())
{
if (it->second->HasNonExpiredLeases ())
return it->second;
else
LogPrint ("All leases of remote LeaseSet expired");
}
else
{
auto ls = i2p::data::netdb.FindLeaseSet (ident);
if (ls)
{
m_RemoteLeaseSets[ident] = ls;
return ls;
}
}
return nullptr;
}
std::shared_ptr<const i2p::data::LeaseSet> ClientDestination::GetLeaseSet ()
{
if (!m_Pool) return nullptr;
if (!m_LeaseSet)
UpdateLeaseSet ();
return m_LeaseSet;
}
void ClientDestination::UpdateLeaseSet ()
{
m_LeaseSet.reset (new i2p::data::LeaseSet (*m_Pool));
}
bool ClientDestination::SubmitSessionKey (const uint8_t * key, const uint8_t * tag)
{
struct
{
uint8_t k[32], t[32];
} data;
memcpy (data.k, key, 32);
memcpy (data.t, tag, 32);
m_Service.post ([this,data](void)
{
this->AddSessionKey (data.k, data.t);
});
return true;
}
void ClientDestination::ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg)
{
m_Service.post (std::bind (&ClientDestination::HandleGarlicMessage, this, msg));
}
void ClientDestination::ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg)
{
m_Service.post (std::bind (&ClientDestination::HandleDeliveryStatusMessage, this, msg));
}
void ClientDestination::HandleI2NPMessage (const uint8_t * buf, size_t len, std::shared_ptr<i2p::tunnel::InboundTunnel> from)
{
uint8_t typeID = buf[I2NP_HEADER_TYPEID_OFFSET];
switch (typeID)
{
case eI2NPData:
HandleDataMessage (buf + I2NP_HEADER_SIZE, bufbe16toh (buf + I2NP_HEADER_SIZE_OFFSET));
break;
case eI2NPDatabaseStore:
HandleDatabaseStoreMessage (buf + I2NP_HEADER_SIZE, bufbe16toh (buf + I2NP_HEADER_SIZE_OFFSET));
break;
case eI2NPDatabaseSearchReply:
HandleDatabaseSearchReplyMessage (buf + I2NP_HEADER_SIZE, bufbe16toh (buf + I2NP_HEADER_SIZE_OFFSET));
break;
default:
i2p::HandleI2NPMessage (CreateI2NPMessage (buf, GetI2NPMessageLength (buf), from));
}
}
void ClientDestination::HandleDatabaseStoreMessage (const uint8_t * buf, size_t len)
{
uint32_t replyToken = bufbe32toh (buf + DATABASE_STORE_REPLY_TOKEN_OFFSET);
size_t offset = DATABASE_STORE_HEADER_SIZE;
if (replyToken)
{
LogPrint (eLogInfo, "Reply token is ignored for DatabaseStore");
offset += 36;
}
std::shared_ptr<i2p::data::LeaseSet> leaseSet;
if (buf[DATABASE_STORE_TYPE_OFFSET] == 1) // LeaseSet
{
LogPrint (eLogDebug, "Remote LeaseSet");
auto it = m_RemoteLeaseSets.find (buf + DATABASE_STORE_KEY_OFFSET);
if (it != m_RemoteLeaseSets.end ())
{
leaseSet = it->second;
leaseSet->Update (buf + offset, len - offset);
if (leaseSet->IsValid ())
LogPrint (eLogDebug, "Remote LeaseSet updated");
else
{
LogPrint (eLogDebug, "Remote LeaseSet update failed");
m_RemoteLeaseSets.erase (it);
leaseSet = nullptr;
}
}
else
{
leaseSet = std::make_shared<i2p::data::LeaseSet> (buf + offset, len - offset);
if (leaseSet->IsValid ())
{
LogPrint (eLogDebug, "New remote LeaseSet added");
m_RemoteLeaseSets[buf + DATABASE_STORE_KEY_OFFSET] = leaseSet;
}
else
{
LogPrint (eLogError, "New remote LeaseSet verification failed");
leaseSet = nullptr;
}
}
}
else
LogPrint (eLogError, "Unexpected client's DatabaseStore type ", buf[DATABASE_STORE_TYPE_OFFSET], ". Dropped");
auto it1 = m_LeaseSetRequests.find (buf + DATABASE_STORE_KEY_OFFSET);
if (it1 != m_LeaseSetRequests.end ())
{
it1->second->requestTimeoutTimer.cancel ();
if (it1->second->requestComplete) it1->second->requestComplete (leaseSet);
delete it1->second;
m_LeaseSetRequests.erase (it1);
}
}
void ClientDestination::HandleDatabaseSearchReplyMessage (const uint8_t * buf, size_t len)
{
i2p::data::IdentHash key (buf);
int num = buf[32]; // num
LogPrint ("DatabaseSearchReply for ", key.ToBase64 (), " num=", num);
auto it = m_LeaseSetRequests.find (key);
if (it != m_LeaseSetRequests.end ())
{
LeaseSetRequest * request = it->second;
bool found = false;
if (request->excluded.size () < MAX_NUM_FLOODFILLS_PER_REQUEST)
{
for (int i = 0; i < num; i++)
{
i2p::data::IdentHash peerHash (buf + 33 + i*32);
auto floodfill = i2p::data::netdb.FindRouter (peerHash);
if (floodfill)
{
LogPrint (eLogInfo, "Requesting ", key.ToBase64 (), " at ", peerHash.ToBase64 ());
if (SendLeaseSetRequest (key, floodfill, request))
found = true;
}
else
{
LogPrint (eLogInfo, "Found new floodfill. Request it");
i2p::data::netdb.RequestDestination (peerHash);
}
}
if (!found)
LogPrint (eLogError, "Suggested floodfills are not presented in netDb");
}
else
LogPrint (eLogInfo, key.ToBase64 (), " was not found on ", MAX_NUM_FLOODFILLS_PER_REQUEST," floodfills");
if (!found)
{
if (request->requestComplete) request->requestComplete (nullptr);
delete request;
m_LeaseSetRequests.erase (key);
}
}
else
LogPrint ("Request for ", key.ToBase64 (), " not found");
}
void ClientDestination::HandleDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg)
{
uint32_t msgID = bufbe32toh (msg->GetPayload () + DELIVERY_STATUS_MSGID_OFFSET);
if (msgID == m_PublishReplyToken)
{
LogPrint (eLogDebug, "Publishing confirmed");
m_ExcludedFloodfills.clear ();
m_PublishReplyToken = 0;
}
else
i2p::garlic::GarlicDestination::HandleDeliveryStatusMessage (msg);
}
void ClientDestination::SetLeaseSetUpdated ()
{
i2p::garlic::GarlicDestination::SetLeaseSetUpdated ();
UpdateLeaseSet ();
if (m_IsPublic)
Publish ();
}
void ClientDestination::Publish ()
{
if (!m_LeaseSet || !m_Pool)
{
LogPrint (eLogError, "Can't publish non-existing LeaseSet");
return;
}
if (m_PublishReplyToken)
{
LogPrint (eLogInfo, "Publishing is pending");
return;
}
auto outbound = m_Pool->GetNextOutboundTunnel ();
if (!outbound)
{
LogPrint ("Can't publish LeaseSet. No outbound tunnels");
return;
}
std::set<i2p::data::IdentHash> excluded;
auto floodfill = i2p::data::netdb.GetClosestFloodfill (m_LeaseSet->GetIdentHash (), m_ExcludedFloodfills);
if (!floodfill)
{
LogPrint ("Can't publish LeaseSet. No more floodfills found");
m_ExcludedFloodfills.clear ();
return;
}
m_ExcludedFloodfills.insert (floodfill->GetIdentHash ());
LogPrint (eLogDebug, "Publish LeaseSet of ", GetIdentHash ().ToBase32 ());
m_PublishReplyToken = i2p::context.GetRandomNumberGenerator ().GenerateWord32 ();
auto msg = WrapMessage (floodfill, i2p::CreateDatabaseStoreMsg (m_LeaseSet, m_PublishReplyToken));
m_PublishConfirmationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_CONFIRMATION_TIMEOUT));
m_PublishConfirmationTimer.async_wait (std::bind (&ClientDestination::HandlePublishConfirmationTimer,
this, std::placeholders::_1));
outbound->SendTunnelDataMsg (floodfill->GetIdentHash (), 0, msg);
}
void ClientDestination::HandlePublishConfirmationTimer (const boost::system::error_code& ecode)
{
if (ecode != boost::asio::error::operation_aborted)
{
if (m_PublishReplyToken)
{
LogPrint (eLogWarning, "Publish confirmation was not received in ", PUBLISH_CONFIRMATION_TIMEOUT, "seconds. Try again");
m_PublishReplyToken = 0;
Publish ();
}
}
}
void ClientDestination::HandleDataMessage (const uint8_t * buf, size_t len)
{
uint32_t length = bufbe32toh (buf);
buf += 4;
// we assume I2CP payload
uint16_t fromPort = bufbe16toh (buf + 4), // source
toPort = bufbe16toh (buf + 6); // destination
switch (buf[9])
{
case PROTOCOL_TYPE_STREAMING:
{
// streaming protocol
auto dest = GetStreamingDestination (toPort);
if (dest)
dest->HandleDataMessagePayload (buf, length);
else
LogPrint ("Missing streaming destination");
}
break;
case PROTOCOL_TYPE_DATAGRAM:
// datagram protocol
if (m_DatagramDestination)
m_DatagramDestination->HandleDataMessagePayload (fromPort, toPort, buf, length);
else
LogPrint ("Missing streaming destination");
break;
default:
LogPrint ("Data: unexpected protocol ", buf[9]);
}
}
void ClientDestination::CreateStream (StreamRequestComplete streamRequestComplete, const i2p::data::IdentHash& dest, int port) {
assert(streamRequestComplete);
auto leaseSet = FindLeaseSet (dest);
if (leaseSet)
streamRequestComplete(CreateStream (leaseSet, port));
else
{
RequestDestination (dest,
[this, streamRequestComplete, port](std::shared_ptr<i2p::data::LeaseSet> ls)
{
if (ls)
streamRequestComplete(CreateStream (ls, port));
else
streamRequestComplete (nullptr);
});
}
}
std::shared_ptr<i2p::stream::Stream> ClientDestination::CreateStream (std::shared_ptr<const i2p::data::LeaseSet> remote, int port)
{
if (m_StreamingDestination)
return m_StreamingDestination->CreateNewOutgoingStream (remote, port);
else
return nullptr;
}
std::shared_ptr<i2p::stream::StreamingDestination> ClientDestination::GetStreamingDestination (int port) const
{
if (port)
{
auto it = m_StreamingDestinationsByPorts.find (port);
if (it != m_StreamingDestinationsByPorts.end ())
return it->second;
}
// if port is zero or not found, use default destination
return m_StreamingDestination;
}
void ClientDestination::AcceptStreams (const i2p::stream::StreamingDestination::Acceptor& acceptor)
{
if (m_StreamingDestination)
m_StreamingDestination->SetAcceptor (acceptor);
}
void ClientDestination::StopAcceptingStreams ()
{
if (m_StreamingDestination)
m_StreamingDestination->ResetAcceptor ();
}
bool ClientDestination::IsAcceptingStreams () const
{
if (m_StreamingDestination)
return m_StreamingDestination->IsAcceptorSet ();
return false;
}
std::shared_ptr<i2p::stream::StreamingDestination> ClientDestination::CreateStreamingDestination (int port)
{
auto dest = std::make_shared<i2p::stream::StreamingDestination> (*this, port);
if (port)
m_StreamingDestinationsByPorts[port] = dest;
else // update default
m_StreamingDestination = dest;
return dest;
}
i2p::datagram::DatagramDestination * ClientDestination::CreateDatagramDestination ()
{
if (!m_DatagramDestination)
m_DatagramDestination = new i2p::datagram::DatagramDestination (*this);
return m_DatagramDestination;
}
bool ClientDestination::RequestDestination (const i2p::data::IdentHash& dest, RequestComplete requestComplete)
{
if (!m_Pool || !IsReady ())
{
if (requestComplete) requestComplete (false);
return false;
}
m_Service.post (std::bind (&ClientDestination::RequestLeaseSet, this, dest, requestComplete));
return true;
}
void ClientDestination::RequestLeaseSet (const i2p::data::IdentHash& dest, RequestComplete requestComplete)
{
std::set<i2p::data::IdentHash> excluded;
auto floodfill = i2p::data::netdb.GetClosestFloodfill (dest, excluded);
if (floodfill)
{
LeaseSetRequest * request = new LeaseSetRequest (m_Service);
request->requestComplete = requestComplete;
auto ret = m_LeaseSetRequests.insert (std::pair<i2p::data::IdentHash, LeaseSetRequest *>(dest,request));
if (ret.second) // inserted
{
if (!SendLeaseSetRequest (dest, floodfill, request))
{
// request failed
if (request->requestComplete) request->requestComplete (nullptr);
delete request;
m_LeaseSetRequests.erase (dest);
}
}
else // duplicate
{
LogPrint (eLogError, "Request of ", dest.ToBase64 (), " is pending already");
// TODO: queue up requests
if (request->requestComplete) request->requestComplete (nullptr);
delete request;
}
}
else
LogPrint (eLogError, "No floodfills found");
}
bool ClientDestination::SendLeaseSetRequest (const i2p::data::IdentHash& dest,
std::shared_ptr<const i2p::data::RouterInfo> nextFloodfill, LeaseSetRequest * request)
{
auto replyTunnel = m_Pool->GetNextInboundTunnel ();
if (!replyTunnel) LogPrint (eLogError, "No inbound tunnels found");
auto outboundTunnel = m_Pool->GetNextOutboundTunnel ();
if (!outboundTunnel) LogPrint (eLogError, "No outbound tunnels found");
if (replyTunnel && outboundTunnel)
{
request->excluded.insert (nextFloodfill->GetIdentHash ());
request->requestTime = i2p::util::GetSecondsSinceEpoch ();
request->requestTimeoutTimer.cancel ();
CryptoPP::AutoSeededRandomPool rnd;
uint8_t replyKey[32], replyTag[32];
rnd.GenerateBlock (replyKey, 32); // random session key
rnd.GenerateBlock (replyTag, 32); // random session tag
AddSessionKey (replyKey, replyTag);
I2NPMessage * msg = WrapMessage (nextFloodfill,
CreateLeaseSetDatabaseLookupMsg (dest, request->excluded,
replyTunnel.get (), replyKey, replyTag));
outboundTunnel->SendTunnelDataMsg (
{
i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
nextFloodfill->GetIdentHash (), 0, msg
}
});
request->requestTimeoutTimer.expires_from_now (boost::posix_time::seconds(LEASESET_REQUEST_TIMEOUT));
request->requestTimeoutTimer.async_wait (std::bind (&ClientDestination::HandleRequestTimoutTimer,
this, std::placeholders::_1, dest));
}
else
return false;
return true;
}
void ClientDestination::HandleRequestTimoutTimer (const boost::system::error_code& ecode, const i2p::data::IdentHash& dest)
{
if (ecode != boost::asio::error::operation_aborted)
{
auto it = m_LeaseSetRequests.find (dest);
if (it != m_LeaseSetRequests.end ())
{
bool done = false;
uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
if (ts < it->second->requestTime + MAX_LEASESET_REQUEST_TIMEOUT)
{
auto floodfill = i2p::data::netdb.GetClosestFloodfill (dest, it->second->excluded);
if (floodfill)
done = !SendLeaseSetRequest (dest, floodfill, it->second);
else
done = true;
}
else
{
LogPrint (eLogInfo, dest.ToBase64 (), " was not found within ", MAX_LEASESET_REQUEST_TIMEOUT, " seconds");
done = true;
}
if (done)
{
if (it->second->requestComplete) it->second->requestComplete (false);
delete it->second;
m_LeaseSetRequests.erase (it);
}
}
}
}
void ClientDestination::HandleCleanupTimer (const boost::system::error_code& ecode)
{
if (ecode != boost::asio::error::operation_aborted)
{
CleanupRoutingSessions ();
CleanupRemoteLeaseSets ();
m_CleanupTimer.expires_from_now (boost::posix_time::minutes (DESTINATION_CLEANUP_TIMEOUT));
m_CleanupTimer.async_wait (std::bind (&ClientDestination::HandleCleanupTimer,
this, std::placeholders::_1));
}
}
void ClientDestination::CleanupRemoteLeaseSets ()
{
for (auto it = m_RemoteLeaseSets.begin (); it != m_RemoteLeaseSets.end ();)
{
if (!it->second->HasNonExpiredLeases ()) // all leases expired
{
LogPrint ("Remote LeaseSet ", it->second->GetIdentHash ().ToBase64 (), " expired");
it = m_RemoteLeaseSets.erase (it);
}
else
it++;
}
}
}
}