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Merge #7642: Avoid "Unknown command" messages when receiving getaddr on outbound c…

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9988554 No "Unknown command" for getaddr command. (R E Broadley)
This commit is contained in:
Pieter Wuille 2016-03-09 21:52:08 +01:00
commit c8d2473e6c
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1 changed files with 11 additions and 6 deletions
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17
src/main.cpp
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@ -5064,13 +5064,18 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
}
// 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 nodes which are behind NAT and can only make outgoing connections ignore
// the getaddr message mitigates the attack.
else if ((strCommand == NetMsgType::GETADDR) && (pfrom->fInbound))
else if (strCommand == NetMsgType::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 nodes which are behind NAT and can only make outgoing connections ignore
// the getaddr message mitigates the attack.
if (!pfrom->fInbound) {
LogPrint("net", "Ignoring \"getaddr\" from outbound connection. peer=%d\n", pfrom->id);
return true;
}
pfrom->vAddrToSend.clear();
vector<CAddress> vAddr = addrman.GetAddr();
BOOST_FOREACH(const CAddress &addr, vAddr)