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Always use a 50% chance to choose between tried and new entries

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This change was suggested as Countermeasure 2 in
Eclipse Attacks on Bitcoin’s Peer-to-Peer Network, Ethan Heilman,
Alison Kendler, Aviv Zohar, Sharon Goldberg. ePrint Archive Report
2015/263. March 2015.
This commit is contained in:
Pieter Wuille
2015-03-19 09:51:59 -07:00
parent f68ba3f67b
commit c6a63ceeb4
3 changed files with 7 additions and 9 deletions
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7
src/addrman.cpp
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@@ -332,14 +332,13 @@ void CAddrMan::Attempt_(const CService& addr, int64_t nTime)
info.nAttempts++;
}
CAddress CAddrMan::Select_(int nUnkBias)
CAddress CAddrMan::Select_()
{
if (size() == 0)
return CAddress();
double nCorTried = sqrt(nTried) * (100.0 - nUnkBias);
double nCorNew = sqrt(nNew) * nUnkBias;
if ((nCorTried + nCorNew) * GetRandInt(1 << 30) / (1 << 30) < nCorTried) {
// Use a 50% chance for choosing between tried and new table entries.
if (nTried > 0 && (nNew == 0 || GetRandInt(2) == 0)) {
// use a tried node
double fChanceFactor = 1.0;
while (1) {