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Add helper function for checking header continuity

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This commit is contained in:
Suhas Daftuar 2022-02-08 17:11:30 -05:00
parent 7f2450871b
commit 9492e93bf9
1 changed files with 21 additions and 10 deletions
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31
src/net_processing.cpp
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@ -565,6 +565,8 @@ private:
* occasional non-connecting header (this can happen due to BIP 130 headers
* announcements for blocks interacting with the 2hr (MAX_FUTURE_BLOCK_TIME) rule). */
void HandleFewUnconnectingHeaders(CNode& pfrom, Peer& peer, const std::vector<CBlockHeader>& headers);
/** Return true if the headers connect to each other, false otherwise */
bool CheckHeadersAreContinuous(const std::vector<CBlockHeader>& headers) const;
void SendBlockTransactions(CNode& pfrom, Peer& peer, const CBlock& block, const BlockTransactionsRequest& req);
@ -2241,6 +2243,18 @@ void PeerManagerImpl::HandleFewUnconnectingHeaders(CNode& pfrom, Peer& peer,
}
}
bool PeerManagerImpl::CheckHeadersAreContinuous(const std::vector<CBlockHeader>& headers) const
{
uint256 hashLastBlock;
for (const CBlockHeader& header : headers) {
if (!hashLastBlock.IsNull() && header.hashPrevBlock != hashLastBlock) {
return false;
}
hashLastBlock = header.GetHash();
}
return true;
}
void PeerManagerImpl::ProcessHeadersMessage(CNode& pfrom, Peer& peer,
const std::vector<CBlockHeader>& headers,
bool via_compact_block)
@ -2271,21 +2285,18 @@ void PeerManagerImpl::ProcessHeadersMessage(CNode& pfrom, Peer& peer,
return;
}
// At this point, the headers connect to something in our block index.
if (!CheckHeadersAreContinuous(headers)) {
Misbehaving(peer, 20, "non-continuous headers sequence");
return;
}
{
LOCK(cs_main);
uint256 hashLastBlock;
for (const CBlockHeader& header : headers) {
if (!hashLastBlock.IsNull() && header.hashPrevBlock != hashLastBlock) {
Misbehaving(peer, 20, "non-continuous headers sequence");
return;
}
hashLastBlock = header.GetHash();
}
// If we don't have the last header, then they'll have given us
// something new (if these headers are valid).
if (!m_chainman.m_blockman.LookupBlockIndex(hashLastBlock)) {
if (!m_chainman.m_blockman.LookupBlockIndex(headers.back().GetHash())) {
received_new_header = true;
}
}