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Politely and safely refuse getheaders requests for headers we have trimmed.

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This commit is contained in:
Glenn Willen 2022-11-22 17:31:01 -08:00
parent 763d29895f
commit 394e59d38d
1 changed files with 7 additions and 0 deletions
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7
src/net_processing.cpp
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@ -3166,10 +3166,17 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
LogPrint(BCLog::NET, "getheaders %d to %s from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.IsNull() ? "end" : hashStop.ToString(), pfrom.GetId());
for (; pindex; pindex = m_chainman.ActiveChain().Next(pindex))
{
if (pindex->trimmed()) {
// For simplicity, if any of the headers they're asking for are trimmed,
// just drop the request.
LogPrint(BCLog::NET, "%s: ignoring getheaders from peer=%i which would return at least one trimmed header\n", __func__, pfrom.GetId());
return;
}
vHeaders.push_back(pindex->GetBlockHeader());
if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
break;
}
// pindex can be nullptr either if we sent m_chainman.ActiveChain().Tip() OR
// if our peer has m_chainman.ActiveChain().Tip() (and thus we are sending an empty
// headers message). In both cases it's safe to update