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handle exploratory lookups

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orignal 2015-02-02 22:34:55 -05:00
parent 7f75d250c7
commit c5a3832eae
2 changed files with 77 additions and 29 deletions
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99
NetDb.cpp
View File

@ -649,6 +649,7 @@ namespace data
key[l] = 0;
uint8_t flag = buf[64];
LogPrint ("DatabaseLookup for ", key, " recieved flags=", (int)flag);
uint8_t lookupType = flag & DATABASE_LOOKUP_TYPE_FLAGS_MASK;
uint8_t * excluded = buf + 65;
uint32_t replyTunnelID = 0;
if (flag & DATABASE_LOOKUP_DELIVERY_FLAG) //reply to tunnel
@ -665,46 +666,69 @@ namespace data
}
I2NPMessage * replyMsg = nullptr;
auto router = FindRouter (buf);
if (router)
if (lookupType == DATABASE_LOOKUP_TYPE_EXPLORATORY_LOOKUP)
{
LogPrint ("Requested RouterInfo ", key, " found");
router->LoadBuffer ();
if (router->GetBuffer ())
replyMsg = CreateDatabaseStoreMsg (router.get ());
}
if (!replyMsg)
{
auto leaseSet = FindLeaseSet (buf);
if (leaseSet) // we don't send back our LeaseSets
{
LogPrint ("Requested LeaseSet ", key, " found");
replyMsg = CreateDatabaseStoreMsg (leaseSet.get ());
}
}
if (!replyMsg)
{
LogPrint ("Requested ", key, " not found. ", numExcluded, " excluded");
LogPrint ("Exploratory close to ", key, " ", numExcluded, " excluded");
std::set<IdentHash> excludedRouters;
for (int i = 0; i < numExcluded; i++)
{
// TODO: check for all zeroes (exploratory)
excludedRouters.insert (excluded);
excluded += 32;
}
std::vector<IdentHash> routers;
for (int i = 0; i < 3; i++)
{
auto floodfill = GetClosestFloodfill (buf, excludedRouters);
if (floodfill)
routers.push_back (floodfill->GetIdentHash ());
auto r = GetClosestNonFloodfill (buf, excludedRouters);
if (r)
{
routers.push_back (r->GetIdentHash ());
excludedRouters.insert (r->GetIdentHash ());
}
}
replyMsg = CreateDatabaseSearchReply (buf, routers);
}
else
excluded += numExcluded*32; // we don't care about exluded
{
auto router = FindRouter (buf);
if (router)
{
LogPrint ("Requested RouterInfo ", key, " found");
router->LoadBuffer ();
if (router->GetBuffer ())
replyMsg = CreateDatabaseStoreMsg (router.get ());
}
if (!replyMsg)
{
auto leaseSet = FindLeaseSet (buf);
if (leaseSet) // we don't send back our LeaseSets
{
LogPrint ("Requested LeaseSet ", key, " found");
replyMsg = CreateDatabaseStoreMsg (leaseSet.get ());
}
}
if (!replyMsg)
{
LogPrint ("Requested ", key, " not found. ", numExcluded, " excluded");
std::set<IdentHash> excludedRouters;
for (int i = 0; i < numExcluded; i++)
{
excludedRouters.insert (excluded);
excluded += 32;
}
std::vector<IdentHash> routers;
for (int i = 0; i < 3; i++)
{
auto floodfill = GetClosestFloodfill (buf, excludedRouters);
if (floodfill)
{
routers.push_back (floodfill->GetIdentHash ());
excludedRouters.insert (floodfill->GetIdentHash ());
}
}
replyMsg = CreateDatabaseSearchReply (buf, routers);
}
}
if (replyMsg)
{
@ -903,6 +927,29 @@ namespace data
return r;
}
std::shared_ptr<const RouterInfo> NetDb::GetClosestNonFloodfill (const IdentHash& destination,
const std::set<IdentHash>& excluded) const
{
std::shared_ptr<const RouterInfo> r;
XORMetric minMetric;
IdentHash destKey = CreateRoutingKey (destination);
minMetric.SetMax ();
// must be called from NetDb thread only
for (auto it: m_RouterInfos)
{
if (!it.second->IsFloodfill () && !excluded.count (it.first))
{
XORMetric m = destKey ^ it.first;
if (m < minMetric)
{
minMetric = m;
r = it.second;
}
}
}
return r;
}
void NetDb::ManageLeaseSets ()
{
for (auto it = m_LeaseSets.begin (); it != m_LeaseSets.end ();)

1
NetDb.h
View File

@ -80,6 +80,7 @@ namespace data
std::shared_ptr<const RouterInfo> GetRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith) const;
std::shared_ptr<const RouterInfo> GetHighBandwidthRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith) const;
std::shared_ptr<const RouterInfo> GetClosestFloodfill (const IdentHash& destination, const std::set<IdentHash>& excluded) const;
std::shared_ptr<const RouterInfo> GetClosestNonFloodfill (const IdentHash& destination, const std::set<IdentHash>& excluded) const;
void SetUnreachable (const IdentHash& ident, bool unreachable);
void PostI2NPMsg (I2NPMessage * msg);