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Merge pull request #5442

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dca799e Ignore getaddr messages on Outbound connections. (Ivan Pustogarov)
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Wladimir J. van der Laan 2015-03-09 12:24:47 +01:00
commit c1b723c30a
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1 changed files with 6 additions and 1 deletions
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7
src/main.cpp
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@ -4021,7 +4021,12 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
} }
else if (strCommand == "getaddr") // This asymmetric behavior for inbound and outbound connections was introduced
// to prevent a fingerprinting attack: an attacker can send specific fake addresses
// to users' AddrMan and later request them by sending getaddr messages.
// Making users (which are behind NAT and can only make outgoing connections) ignore
// getaddr message mitigates the attack.
else if ((strCommand == "getaddr") && (pfrom->fInbound))
{ {
pfrom->vAddrToSend.clear(); pfrom->vAddrToSend.clear();
vector<CAddress> vAddr = addrman.GetAddr(); vector<CAddress> vAddr = addrman.GetAddr();