I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include "I2PEndian.h"
#include <fstream>
#include <vector>
#include <boost/asio.hpp>
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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"
#include "Transports.h"
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#include "RouterContext.h"
#include "Garlic.h"
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#include "NetDb.h"
#include "Reseed.h"
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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;
}
I2NPMessage * RequestedDestination::CreateRequestMessage (const IdentHash& floodfill)
{
I2NPMessage * msg = i2p::CreateDatabaseLookupMsg (m_Destination,
i2p::context.GetRouterInfo ().GetIdentHash () , 0, false, &m_ExcludedPeers);
m_ExcludedPeers.insert (floodfill);
m_LastRouter = nullptr;
m_LastReplyTunnel = nullptr;
return msg;
}
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NetDb netdb;
NetDb::NetDb (): m_IsRunning (false), m_ReseedRetries (0), 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");
while (m_RouterInfos.size () < 100 && m_ReseedRetries < 10)
{
Reseeder reseeder;
reseeder.reseedNow();
m_ReseedRetries++;
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;
}
// TODO: Move to reseed and/or scheduled tasks. (In java version, scheduler fix this as well as sort RIs.)
bool NetDb::CreateNetDb(const char * directory)
{
boost::filesystem::path p (directory);
LogPrint (directory, " doesn't exist, trying to create it.");
if (!boost::filesystem::create_directory (p))
{
LogPrint("Failed to create directory ", directory);
return false;
}
// list of chars might appear in base64 string
const char * chars = GetBase64SubstitutionTable (); // 64 bytes
boost::filesystem::path suffix;
for (int i = 0; i < 64; i++)
{
#ifndef _WIN32
suffix = std::string ("/r") + chars[i];
#else
suffix = std::string ("\\r") + chars[i];
#endif
if (!boost::filesystem::create_directory( boost::filesystem::path (p / suffix) )) return false;
}
return true;
}
void NetDb::Load (const char * directory)
{
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boost::filesystem::path p (directory);
if (!boost::filesystem::exists (p))
{
// seems netDb doesn't exist yet
if (!CreateNetDb(directory)) return;
}
// make sure we cleanup netDb from previous attempts
for (auto r: m_RouterInfos)
delete r.second;
m_RouterInfos.clear ();
// load routers now
int numRouters = 0;
boost::filesystem::directory_iterator end;
for (boost::filesystem::directory_iterator it (p); it != end; ++it)
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{
if (boost::filesystem::is_directory (it->status()))
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{
for (boost::filesystem::directory_iterator it1 (it->path ()); it1 != end; ++it1)
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{
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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;
numRouters++;
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}
}
}
LogPrint (numRouters, " routers loaded");
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}
void NetDb::SaveUpdated (const char * directory)
{
auto GetFilePath = [](const char * directory, const RouterInfo * routerInfo)
{
#ifndef _WIN32
return std::string (directory) + "/r" +
routerInfo->GetIdentHashBase64 ()[0] + "/routerInfo-" +
#else
return std::string (directory) + "\\r" +
routerInfo->GetIdentHashBase64 ()[0] + "\\routerInfo-" +
#endif
routerInfo->GetIdentHashBase64 () + ".dat";
};
int count = 0, deletedCount = 0;
auto total = m_RouterInfos.size ();
uint64_t ts = i2p::util::GetMillisecondsSinceEpoch ();
for (auto it: m_RouterInfos)
{
if (it.second->IsUpdated ())
{
std::ofstream r (GetFilePath(directory, it.second), std::ofstream::binary);
r.write ((char *)it.second->GetBuffer (), it.second->GetBufferLen ());
it.second->SetUpdated (false);
count++;
}
else
{
// RouterInfo expires in 72 hours if more than 300
if (total > 300 && ts > it.second->GetTimestamp () + 3*24*3600*1000LL) // 3 days
{
total--;
it.second->SetUnreachable (true);
}
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)
{
if (isLeaseSet) // we request LeaseSet through tunnels
{
i2p::tunnel::OutboundTunnel * outbound = i2p::tunnel::tunnels.GetNextOutboundTunnel ();
if (outbound)
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{
i2p::tunnel::InboundTunnel * inbound = i2p::tunnel::tunnels.GetNextInboundTunnel ();
if (inbound)
{
RequestedDestination * dest = CreateRequestedDestination (destination, isLeaseSet);
auto floodfill = GetClosestFloodfill (destination, dest->GetExcludedPeers ());
if (floodfill)
{
std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
// DatabaseLookup message
dest->SetLastOutboundTunnel (outbound);
msgs.push_back (i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
floodfill->GetIdentHash (), 0,
dest->CreateRequestMessage (floodfill, inbound)
});
outbound->SendTunnelDataMsg (msgs);
}
else
LogPrint ("No more floodfills found");
}
else
LogPrint ("No inbound tunnels found");
}
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else
LogPrint ("No outbound tunnels found");
}
else // RouterInfo is requested directly
{
RequestedDestination * dest = CreateRequestedDestination (destination, false);
auto floodfill = GetClosestFloodfill (destination, dest->GetExcludedPeers ());
if (floodfill)
{
dest->SetLastOutboundTunnel (nullptr);
i2p::transports.SendMessage (floodfill->GetIdentHash (), dest->CreateRequestMessage (floodfill->GetIdentHash ()));
}
}
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}
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 ();
std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
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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 ());
msgs.push_back (i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
dest->GetLastRouter ()->GetIdentHash (), 0, msg
});
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}
}
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 ());
msgs.push_back (i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
r->GetIdentHash (), 0, msg
});
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}
}
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);
msgs.push_back (i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
dest->GetLastRouter ()->GetIdentHash (), 0, msg
});
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}
}
else // we should send directly
{
if (!dest->IsLeaseSet ()) // if not LeaseSet
i2p::transports.SendMessage (router, dest->CreateRequestMessage (router));
else
LogPrint ("Can't request LeaseSet");
}
}
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}
if (outbound && msgs.size () > 0)
outbound->SendTunnelDataMsg (msgs);
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}
else
{
// no more requests for detination possible. delete it
delete it->second;
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m_RequestedDestinations.erase (it);
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}
}
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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{
auto floodfill = GetRandomRouter (outbound->GetEndpointRouter (), true);
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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);
std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
msgs.push_back (i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
floodfill->GetIdentHash (), 0,
CreateDatabaseStoreMsg () // tell floodfill about us
});
msgs.push_back (i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
floodfill->GetIdentHash (), 0,
dest->CreateRequestMessage (floodfill, inbound) // explore
});
outbound->SendTunnelDataMsg (msgs);
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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 ())
{
delete it->second;
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m_RequestedDestinations.erase (it);
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}
}
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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 RouterInfo * compatibleWith, bool floodfillOnly) 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);
for (int j = 0; j < 2; j++)
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{
uint32_t i = 0;
for (auto it: m_RouterInfos)
{
if (i >= ind)
{
if (!it.second->IsUnreachable () &&
(!compatibleWith || it.second->IsCompatible (*compatibleWith)) &&
(!floodfillOnly || it.second->IsFloodfill ()))
return it.second;
}
else
i++;
}
// we couldn't find anything, try second pass
ind = 0;
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}
return nullptr; // seem we have too few routers
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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 std::set<IdentHash>& excluded) const
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{
RouterInfo * r = nullptr;
XORMetric minMetric;
RoutingKey destKey = CreateRoutingKey (destination);
minMetric.SetMax ();
for (auto it: m_RouterInfos)
{
if (it.second->IsFloodfill () &&! it.second->IsUnreachable () && !excluded.count (it.first))
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{
XORMetric m = destKey ^ it.second->GetRoutingKey ();
if (m < minMetric)
{
minMetric = m;
r = it.second;
}
}
}
return r;
}
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}
}