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i2pd/NetDb.cpp

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#include "I2PEndian.h"
#include <fstream>
#include <vector>
#include <boost/asio.hpp>
#include <cryptopp/gzip.h>
#include "base64.h"
#include "Log.h"
#include "Timestamp.h"
#include "I2NPProtocol.h"
#include "Tunnel.h"
#include "Transports.h"
#include "RouterContext.h"
#include "Garlic.h"
#include "NetDb.h"
#include "Reseed.h"
#include "util.h"
namespace i2p
{
namespace data
{
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, m_IsLeaseSet);
if (m_IsLeaseSet) // wrap lookup message into garlic
msg = i2p::garlic::routing.WrapSingleMessage (*router, msg);
m_ExcludedPeers.insert (router->GetIdentHash ());
m_LastRouter = router;
m_CreationTime = i2p::util::GetSecondsSinceEpoch ();
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_CreationTime = i2p::util::GetSecondsSinceEpoch ();
return msg;
}
void RequestedDestination::ClearExcludedPeers ()
{
m_ExcludedPeers.clear ();
}
#ifndef _WIN32
const char NetDb::m_NetDbPath[] = "/netDb";
#else
const char NetDb::m_NetDbPath[] = "\\netDb";
#endif
NetDb netdb;
NetDb::NetDb (): m_IsRunning (false), m_ReseedRetries (0), m_Thread (0)
{
}
NetDb::~NetDb ()
{
Stop ();
for (auto l:m_LeaseSets)
delete l.second;
for (auto r:m_RouterInfos)
delete r.second;
for (auto r:m_RequestedDestinations)
delete r.second;
}
void NetDb::Start ()
{
Load (m_NetDbPath);
while (m_RouterInfos.size () < 100 && m_ReseedRetries < 10)
{
Reseeder reseeder;
reseeder.reseedNow();
m_ReseedRetries++;
Load (m_NetDbPath);
}
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 lastSave = 0, lastPublish = 0, lastKeyspaceRotation = 0;
m_IsRunning = true;
while (m_IsRunning)
{
try
{
I2NPMessage * msg = m_Queue.GetNextWithTimeout (10000); // 10 sec
if (msg)
{
while (msg)
{
switch (msg->GetHeader ()->typeID)
{
case eI2NPDatabaseStore:
HandleDatabaseStoreMsg (msg->GetPayload (), msg->GetLength ()); // TODO
i2p::DeleteI2NPMessage (msg);
break;
case eI2NPDatabaseSearchReply:
HandleDatabaseSearchReplyMsg (msg);
break;
case eI2NPDatabaseLookup:
HandleDatabaseLookupMsg (msg);
break;
default: // WTF?
LogPrint ("NetDb: unexpected message type ", msg->GetHeader ()->typeID);
i2p::HandleI2NPMessage (msg);
}
msg = m_Queue.Get ();
}
}
else // if no new DatabaseStore coming, explore it
{
auto numRouters = m_RouterInfos.size ();
Explore (numRouters < 1500 ? 5 : 1);
}
uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
if (ts - lastSave >= 60) // save routers and validate subscriptions every minute
{
if (lastSave)
{
SaveUpdated (m_NetDbPath);
ValidateSubscriptions ();
}
lastSave = ts;
}
if (ts - lastPublish >= 600) // publish every 10 minutes
{
Publish ();
lastPublish = ts;
}
if (ts % 86400 < 60 && ts - lastKeyspaceRotation >= 60) // wihhin 1 minutes since midnight (86400 = 24*3600)
{
KeyspaceRotation ();
lastKeyspaceRotation = ts;
}
}
catch (std::exception& ex)
{
LogPrint ("NetDb: ", ex.what ());
}
}
}
void NetDb::AddRouterInfo (const IdentHash& ident, uint8_t * buf, int len)
{
DeleteRequestedDestination (ident);
auto it = m_RouterInfos.find(ident);
if (it != m_RouterInfos.end ())
{
auto ts = it->second->GetTimestamp ();
it->second->Update (buf, len);
if (it->second->GetTimestamp () > ts)
LogPrint ("RouterInfo updated");
}
else
{
LogPrint ("New RouterInfo added");
RouterInfo * r = new RouterInfo (buf, len);
m_RouterInfos[r->GetIdentHash ()] = r;
if (r->IsFloodfill ())
m_Floodfills.push_back (r);
}
}
void NetDb::AddLeaseSet (const IdentHash& ident, uint8_t * buf, int len)
{
DeleteRequestedDestination (ident);
auto it = m_LeaseSets.find(ident);
if (it != m_LeaseSets.end ())
{
it->second->Update (buf, len);
LogPrint ("LeaseSet updated");
}
else
{
LogPrint ("New LeaseSet added");
m_LeaseSets[ident] = new LeaseSet (buf, len);
}
}
RouterInfo * NetDb::FindRouter (const IdentHash& ident) const
{
auto it = m_RouterInfos.find (ident);
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(boost::filesystem::path directory)
{
LogPrint (directory.string(), " doesn't exist, trying to create it.");
if (!boost::filesystem::create_directory (directory))
{
LogPrint("Failed to create directory ", directory.string());
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 (directory / suffix) )) return false;
}
return true;
}
void NetDb::Load (const char * directory)
{
boost::filesystem::path p (i2p::util::filesystem::GetDataDir());
p /= (directory);
if (!boost::filesystem::exists (p))
{
// seems netDb doesn't exist yet
if (!CreateNetDb(p)) return;
}
// make sure we cleanup netDb from previous attempts
for (auto r: m_RouterInfos)
delete r.second;
m_RouterInfos.clear ();
m_Floodfills.clear ();
// load routers now
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)
{
#if BOOST_VERSION > 10500
RouterInfo * r = new RouterInfo (it1->path().string());
#else
RouterInfo * r = new RouterInfo(it1->path());
#endif
r->DeleteBuffer ();
m_RouterInfos[r->GetIdentHash ()] = r;
if (r->IsFloodfill ())
m_Floodfills.push_back (r);
numRouters++;
}
}
}
LogPrint (numRouters, " routers loaded");
LogPrint (m_Floodfills.size (), " floodfills loaded");
}
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";
};
boost::filesystem::path p (i2p::util::filesystem::GetDataDir());
p /= (directory);
#if BOOST_VERSION > 10500
const char * fullDirectory = p.string().c_str ();
#else
const char * fullDirectory = p.c_str ();
#endif
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 ())
{
it.second->SaveToFile (GetFilePath(fullDirectory, it.second));
it.second->SetUpdated (false);
it.second->DeleteBuffer ();
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 (fullDirectory, it.second)))
{
boost::filesystem::remove (GetFilePath (fullDirectory, it.second));
deletedCount++;
}
}
}
}
if (count > 0)
LogPrint (count," new/updated routers saved");
if (deletedCount > 0)
LogPrint (deletedCount," routers deleted");
}
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)
{
i2p::tunnel::InboundTunnel * inbound = i2p::tunnel::tunnels.GetNextInboundTunnel ();
if (inbound)
{
RequestedDestination * dest = CreateRequestedDestination (destination, isLeaseSet);
std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
// request 3 closests floodfills
for (int i = 0; i < 3; i++)
{
auto floodfill = GetClosestFloodfill (destination, dest->GetExcludedPeers ());
if (floodfill)
{
// DatabaseLookup message
msgs.push_back (i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
floodfill->GetIdentHash (), 0,
dest->CreateRequestMessage (floodfill, inbound)
});
}
}
if (msgs.size () > 0)
{
dest->ClearExcludedPeers ();
outbound->SendTunnelDataMsg (msgs);
}
else
LogPrint ("No more floodfills found");
}
else
LogPrint ("No inbound tunnels found");
}
else
LogPrint ("No outbound tunnels found");
}
else // RouterInfo is requested directly
{
RequestedDestination * dest = CreateRequestedDestination (destination, false);
auto floodfill = GetClosestFloodfill (destination, dest->GetExcludedPeers ());
if (floodfill)
i2p::transports.SendMessage (floodfill->GetIdentHash (), dest->CreateRequestMessage (floodfill->GetIdentHash ()));
}
}
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)
{
LogPrint ("LeaseSet");
AddLeaseSet (msg->key, 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 (msg->key, uncompressed, uncomressedSize);
}
}
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);
auto it = m_RequestedDestinations.find (IdentHash (buf));
if (it != m_RequestedDestinations.end ())
{
RequestedDestination * dest = it->second;
bool deleteDest = true;
if (num > 0)
{
auto exploratoryPool = i2p::tunnel::tunnels.GetExploratoryPool ();
auto outbound = exploratoryPool ? exploratoryPool->GetNextOutboundTunnel () : nullptr;
auto inbound = exploratoryPool ? exploratoryPool->GetNextInboundTunnel () : nullptr;
std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
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);
if (dest->IsExploratory ())
{
auto r = FindRouter (router);
if (!r || i2p::util::GetMillisecondsSinceEpoch () > r->GetTimestamp () + 3600*1000LL)
{
// router with ident not found or too old (1 hour)
LogPrint ("Found new/outdated router. Requesting RouterInfo ...");
if (outbound && inbound && dest->GetLastRouter ())
{
RequestedDestination * d1 = CreateRequestedDestination (router, false, false);
auto msg = d1->CreateRequestMessage (dest->GetLastRouter (), inbound);
msgs.push_back (i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
dest->GetLastRouter ()->GetIdentHash (), 0, msg
});
}
}
else
LogPrint ("Bayan");
}
else
{
// reply to our destination. Try other floodfills
if (outbound && inbound && dest->GetLastRouter ())
{
auto r = FindRouter (router);
// do we have that floodfill router in our database?
if (r)
{
// we do
if (!dest->IsExcluded (r->GetIdentHash ()) && dest->GetNumExcludedPeers () < 30) // TODO: fix TunnelGateway first
{
LogPrint ("Try ", key, " at floodfill ", peerHash);
// tell floodfill about us
msgs.push_back (i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
r->GetIdentHash (), 0,
CreateDatabaseStoreMsg ()
});
// request destination
auto msg = dest->CreateRequestMessage (r, inbound);
msgs.push_back (i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
r->GetIdentHash (), 0, msg
});
deleteDest = false;
}
}
else
{
// request router
LogPrint ("Found new floodfill. Request it");
RequestedDestination * d2 = CreateRequestedDestination (router, false, false);
I2NPMessage * msg = d2->CreateRequestMessage (dest->GetLastRouter (), inbound);
msgs.push_back (i2p::tunnel::TunnelMessageBlock
{
i2p::tunnel::eDeliveryTypeRouter,
dest->GetLastRouter ()->GetIdentHash (), 0, msg
});
}
}
else // we should send directly
{
if (!dest->IsLeaseSet ()) // if not LeaseSet
{
if (!dest->IsExcluded (router) && dest->GetNumExcludedPeers () < 30)
{
LogPrint ("Try ", key, " at floodfill ", peerHash, " directly");
i2p::transports.SendMessage (router, dest->CreateRequestMessage (router));
deleteDest = false;
}
}
else
LogPrint ("Can't request LeaseSet");
}
}
}
if (outbound && msgs.size () > 0)
outbound->SendTunnelDataMsg (msgs);
if (deleteDest)
{
// no more requests for tha destinationation. delete it
delete it->second;
m_RequestedDestinations.erase (it);
}
}
else
{
// no more requests for detination possible. delete it
delete it->second;
m_RequestedDestinations.erase (it);
}
}
else
LogPrint ("Requested destination for ", key, " not found");
i2p::DeleteI2NPMessage (msg);
}
void NetDb::HandleDatabaseLookupMsg (I2NPMessage * msg)
{
uint8_t * buf = msg->GetPayload ();
char key[48];
int l = i2p::data::ByteStreamToBase64 (buf, 32, key, 48);
key[l] = 0;
LogPrint ("DatabaseLookup for ", key, " recieved");
uint8_t flag = buf[64];
uint32_t replyTunnelID = 0;
if (flag & 0x01) //reply to tunnel
replyTunnelID = be32toh (*(uint32_t *)(buf + 64));
// TODO: implement search. We send non-found for now
I2NPMessage * replyMsg = CreateDatabaseSearchReply (buf);
if (replyTunnelID)
i2p::tunnel::tunnels.GetNextOutboundTunnel ()->SendTunnelDataMsg (buf+32, replyTunnelID, replyMsg);
else
i2p::transports.SendMessage (buf, replyMsg);
i2p::DeleteI2NPMessage (msg);
}
void NetDb::Explore (int numDestinations)
{
// clean up previous exploratories
uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
for (auto it = m_RequestedDestinations.begin (); it != m_RequestedDestinations.end ();)
{
if (it->second->IsExploratory () || ts > it->second->GetCreationTime () + 60) // no response for 1 minute
{
delete it->second;
it = m_RequestedDestinations.erase (it);
}
else
it++;
}
// new requests
auto exploratoryPool = i2p::tunnel::tunnels.GetExploratoryPool ();
auto outbound = exploratoryPool ? exploratoryPool->GetNextOutboundTunnel () : nullptr;
auto inbound = exploratoryPool ? exploratoryPool->GetNextInboundTunnel () : nullptr;
bool throughTunnels = outbound && inbound;
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
uint8_t randomHash[32];
std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
std::set<const RouterInfo *> floodfills;
LogPrint ("Exploring new ", numDestinations, " routers ...");
for (int i = 0; i < numDestinations; i++)
{
rnd.GenerateBlock (randomHash, 32);
RequestedDestination * dest = CreateRequestedDestination (IdentHash (randomHash), false, true);
auto floodfill = GetClosestFloodfill (randomHash, dest->GetExcludedPeers ());
if (floodfill && !floodfills.count (floodfill)) // request floodfill only once
{
floodfills.insert (floodfill);
if (throughTunnels)
{
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
});
}
else
i2p::transports.SendMessage (floodfill->GetIdentHash (), dest->CreateRequestMessage (floodfill->GetIdentHash ()));
}
else
DeleteRequestedDestination (dest);
}
if (throughTunnels && msgs.size () > 0)
outbound->SendTunnelDataMsg (msgs);
}
void NetDb::Publish ()
{
std::set<IdentHash> excluded; // TODO: fill up later
for (int i = 0; i < 3; i++)
{
auto floodfill = GetClosestFloodfill (i2p::context.GetRouterInfo ().GetIdentHash (), excluded);
if (floodfill)
{
LogPrint ("Publishing our RouterInfo to ", floodfill->GetIdentHashAbbreviation ());
transports.SendMessage (floodfill->GetIdentHash (), CreateDatabaseStoreMsg ());
excluded.insert (floodfill->GetIdentHash ());
}
}
}
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;
m_RequestedDestinations.erase (it);
}
}
void NetDb::DeleteRequestedDestination (RequestedDestination * dest)
{
if (dest)
{
m_RequestedDestinations.erase (dest->GetDestination ());
delete dest;
}
}
const RouterInfo * NetDb::GetRandomRouter (const RouterInfo * compatibleWith) const
{
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
uint32_t ind = rnd.GenerateWord32 (0, m_RouterInfos.size () - 1);
for (int j = 0; j < 2; j++)
{
uint32_t i = 0;
for (auto it: m_RouterInfos)
{
if (i >= ind)
{
if (!it.second->IsUnreachable () && !it.second->IsHidden () &&
(!compatibleWith || it.second->IsCompatible (*compatibleWith)))
return it.second;
}
else
i++;
}
// we couldn't find anything, try second pass
ind = 0;
}
return nullptr; // seems we have too few routers
}
void NetDb::PostI2NPMsg (I2NPMessage * msg)
{
if (msg) m_Queue.Put (msg);
}
const RouterInfo * NetDb::GetClosestFloodfill (const IdentHash& destination,
const std::set<IdentHash>& excluded) const
{
RouterInfo * r = nullptr;
XORMetric minMetric;
RoutingKey destKey = CreateRoutingKey (destination);
minMetric.SetMax ();
for (auto it: m_Floodfills)
{
if (!it->IsUnreachable () && !excluded.count (it->GetIdentHash ()))
{
XORMetric m = destKey ^ it->GetRoutingKey ();
if (m < minMetric)
{
minMetric = m;
r = it;
}
}
}
return r;
}
void NetDb::Subscribe (const IdentHash& ident)
{
LeaseSet * leaseSet = FindLeaseSet (ident);
if (!leaseSet)
{
LogPrint ("LeaseSet requested");
RequestDestination (ident, true);
}
m_Subscriptions.insert (ident);
}
void NetDb::Unsubscribe (const IdentHash& ident)
{
m_Subscriptions.erase (ident);
}
void NetDb::ValidateSubscriptions ()
{
for (auto it : m_Subscriptions)
{
LeaseSet * leaseSet = FindLeaseSet (it);
if (!leaseSet || leaseSet->HasExpiredLeases ())
{
LogPrint ("LeaseSet re-requested");
RequestDestination (it, true);
}
}
}
void NetDb::KeyspaceRotation ()
{
for (auto it: m_RouterInfos)
it.second->UpdateRoutingKey ();
LogPrint ("Keyspace rotation complete");
Publish ();
}
}
}
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