I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include "I2PEndian.h"
#include <fstream>
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#include <boost/filesystem.hpp>
#include <cryptopp/gzip.h>
#include "base64.h"
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#include "Log.h"
#include "Timestamp.h"
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#include "I2NPProtocol.h"
#include "Tunnel.h"
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#include "RouterContext.h"
#include "Garlic.h"
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#include "NetDb.h"
namespace i2p
{
namespace data
{
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I2NPMessage * RequestedDestination::CreateRequestMessage (const RouterInfo * router,
const i2p::tunnel::InboundTunnel * replyTunnel)
{
I2NPMessage * msg = i2p::CreateDatabaseLookupMsg (m_Destination,
replyTunnel->GetNextIdentHash (), replyTunnel->GetNextTunnelID (), m_IsExploratory, &m_ExcludedPeers);
if (m_IsLeaseSet) // wrap lookup message into garlic
msg = i2p::garlic::routing.WrapSingleMessage (router, msg);
m_ExcludedPeers.insert (router->GetIdentHash ());
m_LastRouter = router;
m_LastReplyTunnel = replyTunnel;
return msg;
}
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NetDb netdb;
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NetDb::NetDb (): m_IsRunning (false), m_Thread (0)
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{
}
NetDb::~NetDb ()
{
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Stop ();
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for (auto l:m_LeaseSets)
delete l.second;
for (auto r:m_RouterInfos)
delete r.second;
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for (auto r:m_RequestedDestinations)
delete r.second;
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}
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void NetDb::Start ()
{
Load ("netDb");
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m_Thread = new std::thread (std::bind (&NetDb::Run, this));
}
void NetDb::Stop ()
{
if (m_Thread)
{
m_IsRunning = false;
m_Thread->join ();
delete m_Thread;
m_Thread = 0;
}
}
void NetDb::Run ()
{
uint32_t lastTs = 0;
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m_IsRunning = true;
while (m_IsRunning)
{
try
{
I2NPMessage * msg = m_Queue.GetNextWithTimeout (10000); // 10 sec
if (msg)
{
while (msg)
{
if (msg->GetHeader ()->typeID == eI2NPDatabaseStore)
{
HandleDatabaseStoreMsg (msg->GetPayload (), msg->GetLength ()); // TODO
i2p::DeleteI2NPMessage (msg);
}
else if (msg->GetHeader ()->typeID == eI2NPDatabaseSearchReply)
HandleDatabaseSearchReplyMsg (msg);
else // WTF?
{
LogPrint ("NetDb: unexpected message type ", msg->GetHeader ()->typeID);
i2p::HandleI2NPMessage (msg, false);
}
msg = m_Queue.Get ();
}
}
else // if no new DatabaseStore coming, explore it
Explore ();
uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
if (ts - lastTs >= 60) // save routers every minute
{
if (lastTs)
SaveUpdated ("netDb");
lastTs = ts;
}
}
catch (std::exception& ex)
{
LogPrint ("NetDb: ", ex.what ());
}
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}
}
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void NetDb::AddRouterInfo (uint8_t * buf, int len)
{
RouterInfo * r = new RouterInfo (buf, len);
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DeleteRequestedDestination (r->GetIdentHash ());
auto it = m_RouterInfos.find(r->GetIdentHash ());
if (it != m_RouterInfos.end ())
{
if (r->GetTimestamp () > it->second->GetTimestamp ())
{
LogPrint ("RouterInfo updated");
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*(it->second) = *r; // we can't replace pointer because it's used by tunnels
}
delete r;
}
else
{
LogPrint ("New RouterInfo added");
m_RouterInfos[r->GetIdentHash ()] = r;
}
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}
void NetDb::AddLeaseSet (uint8_t * buf, int len)
{
LeaseSet * l = new LeaseSet (buf, len);
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DeleteRequestedDestination (l->GetIdentHash ());
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auto it = m_LeaseSets.find(l->GetIdentHash ());
if (it != m_LeaseSets.end ())
{
LogPrint ("LeaseSet updated");
*(it->second) = *l; // we can't replace pointer because it's used by streams
delete l;
}
else
{
LogPrint ("New LeaseSet added");
m_LeaseSets[l->GetIdentHash ()] = l;
}
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}
RouterInfo * NetDb::FindRouter (const IdentHash& ident) const
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{
auto it = m_RouterInfos.find (ident);
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if (it != m_RouterInfos.end ())
return it->second;
else
return nullptr;
}
LeaseSet * NetDb::FindLeaseSet (const IdentHash& destination) const
{
auto it = m_LeaseSets.find (destination);
if (it != m_LeaseSets.end ())
return it->second;
else
return nullptr;
}
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void NetDb::Load (const char * directory)
{
boost::filesystem::path p (directory);
if (boost::filesystem::exists (p))
{
int numRouters = 0;
boost::filesystem::directory_iterator end;
for (boost::filesystem::directory_iterator it (p); it != end; ++it)
{
if (boost::filesystem::is_directory (it->status()))
{
for (boost::filesystem::directory_iterator it1 (it->path ()); it1 != end; ++it1)
{
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#if BOOST_VERSION > 10500
RouterInfo * r = new RouterInfo (it1->path().string().c_str ());
#else
RouterInfo * r = new RouterInfo(it1->path().c_str());
#endif
m_RouterInfos[r->GetIdentHash ()] = r;
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numRouters++;
}
}
}
LogPrint (numRouters, " routers loaded");
}
else
LogPrint (directory, " doesn't exist");
}
void NetDb::SaveUpdated (const char * directory)
{
auto GetFilePath = [](const char * directory, const RouterInfo * routerInfo)
{
return std::string (directory) + "/r" +
routerInfo->GetIdentHashBase64 ()[0] + "/routerInfo-" +
routerInfo->GetIdentHashBase64 () + ".dat";
};
int count = 0, deletedCount = 0;
for (auto it: m_RouterInfos)
{
if (it.second->IsUpdated ())
{
std::ofstream r (GetFilePath(directory, it.second));
r.write ((char *)it.second->GetBuffer (), it.second->GetBufferLen ());
it.second->SetUpdated (false);
count++;
}
else if (it.second->IsUnreachable ())
{
if (boost::filesystem::exists (GetFilePath (directory, it.second)))
{
boost::filesystem::remove (GetFilePath (directory, it.second));
deletedCount++;
}
}
}
if (count > 0)
LogPrint (count," new/updated routers saved");
if (deletedCount > 0)
LogPrint (deletedCount," routers deleted");
}
void NetDb::RequestDestination (const char * b32)
{
uint8_t destination[32];
Base32ToByteStream (b32, strlen(b32), destination, 32);
RequestDestination (destination, true);
}
void NetDb::RequestDestination (const IdentHash& destination, bool isLeaseSet)
{
auto floodfill= GetRandomNTCPRouter (true);
if (floodfill)
RequestDestination (destination, floodfill, isLeaseSet);
else
LogPrint ("No floodfill routers found");
}
void NetDb::RequestDestination (const IdentHash& destination, const RouterInfo * floodfill, bool isLeaseSet)
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{
if (!floodfill) return;
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i2p::tunnel::OutboundTunnel * outbound = i2p::tunnel::tunnels.GetNextOutboundTunnel ();
if (outbound)
{
i2p::tunnel::InboundTunnel * inbound = i2p::tunnel::tunnels.GetNextInboundTunnel ();
if (inbound)
{
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RequestedDestination * dest = CreateRequestedDestination (destination, isLeaseSet);
dest->SetLastOutboundTunnel (outbound);
auto msg = dest->CreateRequestMessage (floodfill, inbound);
outbound->SendTunnelDataMsg (floodfill->GetIdentHash (), 0, msg);
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}
else
LogPrint ("No inbound tunnels found");
}
else
LogPrint ("No outbound tunnels found");
}
void NetDb::HandleDatabaseStoreMsg (uint8_t * buf, size_t len)
{
I2NPDatabaseStoreMsg * msg = (I2NPDatabaseStoreMsg *)buf;
size_t offset = sizeof (I2NPDatabaseStoreMsg);
if (msg->replyToken)
offset += 36;
if (msg->type)
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{
LogPrint ("LeaseSet");
AddLeaseSet (buf + offset, len - offset);
}
else
{
LogPrint ("RouterInfo");
size_t size = be16toh (*(uint16_t *)(buf + offset));
if (size > 2048)
{
LogPrint ("Invalid RouterInfo length ", (int)size);
return;
}
offset += 2;
CryptoPP::Gunzip decompressor;
decompressor.Put (buf + offset, size);
decompressor.MessageEnd();
uint8_t uncompressed[2048];
size_t uncomressedSize = decompressor.MaxRetrievable ();
decompressor.Get (uncompressed, uncomressedSize);
AddRouterInfo (uncompressed, uncomressedSize);
}
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}
void NetDb::HandleDatabaseSearchReplyMsg (I2NPMessage * msg)
{
uint8_t * buf = msg->GetPayload ();
char key[48];
int l = i2p::data::ByteStreamToBase64 (buf, 32, key, 48);
key[l] = 0;
int num = buf[32]; // num
LogPrint ("DatabaseSearchReply for ", key, " num=", num);
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auto it = m_RequestedDestinations.find (IdentHash (buf));
if (it != m_RequestedDestinations.end ())
{
RequestedDestination * dest = it->second;
if (num > 0)
{
i2p::tunnel::OutboundTunnel * outbound = dest->GetLastOutboundTunnel ();
const i2p::tunnel::InboundTunnel * inbound = dest->GetLastReplyTunnel ();
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for (int i = 0; i < num; i++)
{
uint8_t * router = buf + 33 + i*32;
char peerHash[48];
int l1 = i2p::data::ByteStreamToBase64 (router, 32, peerHash, 48);
peerHash[l1] = 0;
LogPrint (i,": ", peerHash);
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if (dest->IsExploratory ())
{
if (!FindRouter (router)) // router with ident not found
{
LogPrint ("Found new router. Requesting RouterInfo ...");
if (outbound && inbound)
{
RequestedDestination * d1 = CreateRequestedDestination (router, false, false);
d1->SetLastOutboundTunnel (outbound);
auto msg = d1->CreateRequestMessage (dest->GetLastRouter (), dest->GetLastReplyTunnel ());
outbound->GetTunnelGateway ().PutTunnelDataMsg (dest->GetLastRouter ()->GetIdentHash (), 0, msg);
}
}
else
LogPrint ("Bayan");
}
else
{
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// reply to our destination. Try other floodfills
if (outbound && inbound)
{
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auto r = FindRouter (router);
// do we have that floodfill router in our database?
if (r)
{
if (!dest->IsExcluded (r->GetIdentHash ()) && dest->GetNumExcludedPeers () < 30) // TODO: fix TunnelGateway first
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{
// request destination
auto msg = dest->CreateRequestMessage (r, dest->GetLastReplyTunnel ());
outbound->GetTunnelGateway ().PutTunnelDataMsg (r->GetIdentHash (), 0, msg);
}
}
else
{
// request router
LogPrint ("Found new floodfill. Request it");
RequestedDestination * d2 = CreateRequestedDestination (router, false, false);
d2->SetLastOutboundTunnel (outbound);
I2NPMessage * msg = d2->CreateRequestMessage (dest->GetLastRouter (), inbound);
outbound->GetTunnelGateway ().PutTunnelDataMsg (
dest->GetLastRouter ()->GetIdentHash (), 0, msg);
}
}
}
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}
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if (outbound)
outbound->GetTunnelGateway ().SendBuffer ();
}
else
{
// no more requests for detination possible. delete it
m_RequestedDestinations.erase (it);
delete it->second;
}
}
else
LogPrint ("Requested destination for ", key, " not found");
i2p::DeleteI2NPMessage (msg);
}
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void NetDb::Explore ()
{
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auto outbound = i2p::tunnel::tunnels.GetNextOutboundTunnel ();
auto inbound = i2p::tunnel::tunnels.GetNextInboundTunnel ();
if (outbound && inbound)
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{
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auto floodfill = GetRandomNTCPRouter (true);
if (floodfill)
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{
LogPrint ("Exploring new routers ...");
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
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uint8_t randomHash[32];
rnd.GenerateBlock (randomHash, 32);
RequestedDestination * dest = CreateRequestedDestination (IdentHash (randomHash), false, true);
dest->SetLastOutboundTunnel (outbound);
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outbound->GetTunnelGateway ().PutTunnelDataMsg (floodfill->GetIdentHash (), 0,
CreateDatabaseStoreMsg ()); // tell floodfill about us
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outbound->GetTunnelGateway ().PutTunnelDataMsg (floodfill->GetIdentHash (), 0,
dest->CreateRequestMessage (floodfill, inbound)); // explore
outbound->GetTunnelGateway ().SendBuffer ();
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}
}
}
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RequestedDestination * NetDb::CreateRequestedDestination (const IdentHash& dest,
bool isLeaseSet, bool isExploratory)
{
auto it = m_RequestedDestinations.find (dest);
if (it == m_RequestedDestinations.end ()) // not exist yet
{
RequestedDestination * d = new RequestedDestination (dest, isLeaseSet, isExploratory);
m_RequestedDestinations[dest] = d;
return d;
}
else
return it->second;
}
void NetDb::DeleteRequestedDestination (const IdentHash& dest)
{
auto it = m_RequestedDestinations.find (dest);
if (it != m_RequestedDestinations.end ())
{
m_RequestedDestinations.erase (it);
delete it->second;
}
}
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const RouterInfo * NetDb::GetRandomNTCPRouter (bool floodfillOnly) const
{
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
uint32_t ind = rnd.GenerateWord32 (0, m_RouterInfos.size () - 1), i = 0;
RouterInfo * last = nullptr;
for (auto it: m_RouterInfos)
{
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if (it.second->IsNTCP () && !it.second->IsUnreachable () &&
(!floodfillOnly || it.second->IsFloodfill ()))
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last = it.second;
if (i >= ind) break;
else i++;
}
return last;
}
const RouterInfo * NetDb::GetRandomRouter () const
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{
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CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
uint32_t ind = rnd.GenerateWord32 (0, m_RouterInfos.size () - 1), i = 0;
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for (auto it: m_RouterInfos)
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{
if (i >= ind) return it.second;
else i++;
}
return nullptr;
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}
void NetDb::PostI2NPMsg (I2NPMessage * msg)
{
if (msg) m_Queue.Put (msg);
}
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const RouterInfo * NetDb::GetClosestFloodfill (const IdentHash& destination) const
{
RouterInfo * r = nullptr;
XORMetric minMetric;
RoutingKey destKey = CreateRoutingKey (destination);
minMetric.SetMax ();
for (auto it: m_RouterInfos)
{
if (it.second->IsFloodfill () &&! it.second->IsUnreachable ())
{
XORMetric m = destKey ^ it.second->GetRoutingKey ();
if (m < minMetric)
{
minMetric = m;
r = it.second;
}
}
}
return r;
}
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}
}