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Merge #16188: net: Document what happens to getdata of unknown type

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dddd9270f8 net: Document what happens to getdata of unknonw type (MarcoFalke)

Pull request description:

  Any getdata of unknown type will never be processed and blocks all future messages from a peer. This isn't obviously clear from reading the code, so document it.

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fanquake 2019-06-25 10:57:10 +08:00
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6
src/net_processing.cpp
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@ -1555,6 +1555,11 @@ void static ProcessGetData(CNode* pfrom, const CChainParams& chainparams, CConnm
} }
} }
// Unknown types in the GetData stay in vRecvGetData and block any future
// message from this peer, see vRecvGetData check in ProcessMessages().
// Depending on future p2p changes, we might either drop unknown getdata on
// the floor or disconnect the peer.
pfrom->vRecvGetData.erase(pfrom->vRecvGetData.begin(), it); pfrom->vRecvGetData.erase(pfrom->vRecvGetData.begin(), it);
if (!vNotFound.empty()) { if (!vNotFound.empty()) {
@ -3260,6 +3265,7 @@ bool PeerLogicValidation::ProcessMessages(CNode* pfrom, std::atomic<bool>& inter
return false; return false;
// this maintains the order of responses // this maintains the order of responses
// and prevents vRecvGetData to grow unbounded
if (!pfrom->vRecvGetData.empty()) return true; if (!pfrom->vRecvGetData.empty()) return true;
if (!pfrom->orphan_work_set.empty()) return true; if (!pfrom->orphan_work_set.empty()) return true;