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net: limit BIP37 filter lifespan (active between 'filterload' and 'filterclear')

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Previously, a default match-everything bloom filter was set for every peer,
i.e. even before receiving a 'filterload' message and after receiving a
'filterclear' message code branches checking for the existence of the filter
by testing the pointer "pfilter" were _always_ executed.
This commit is contained in:
Sebastian Falbesoner 2020-04-06 17:34:07 +02:00
parent 661bd5dea3
commit 5eae034996
2 changed files with 2 additions and 3 deletions
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3
src/net.h
View file

@ -809,14 +809,13 @@ public:
RecursiveMutex cs_inventory;
struct TxRelay {
TxRelay() { pfilter = MakeUnique<CBloomFilter>(); }
mutable RecursiveMutex cs_filter;
// We use fRelayTxes for two purposes -
// a) it allows us to not relay tx invs before receiving the peer's version message
// b) the peer may tell us in its version message that we should not relay tx invs
// unless it loads a bloom filter.
bool fRelayTxes GUARDED_BY(cs_filter){false};
std::unique_ptr<CBloomFilter> pfilter PT_GUARDED_BY(cs_filter) GUARDED_BY(cs_filter);
std::unique_ptr<CBloomFilter> pfilter PT_GUARDED_BY(cs_filter) GUARDED_BY(cs_filter){nullptr};
mutable RecursiveMutex cs_tx_inventory;
CRollingBloomFilter filterInventoryKnown GUARDED_BY(cs_tx_inventory){50000, 0.000001};

2
src/net_processing.cpp
View file

@ -3198,7 +3198,7 @@ bool ProcessMessage(CNode* pfrom, const std::string& msg_type, CDataStream& vRec
}
LOCK(pfrom->m_tx_relay->cs_filter);
if (pfrom->GetLocalServices() & NODE_BLOOM) {
pfrom->m_tx_relay->pfilter.reset(new CBloomFilter());
pfrom->m_tx_relay->pfilter = nullptr;
}
pfrom->m_tx_relay->fRelayTxes = true;
return true;