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Merge #7974: More comments on the design of AttemptToEvictConnection.

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d90351f More comments on the design of AttemptToEvictConnection. (Gregory Maxwell)
This commit is contained in:
Wladimir J. van der Laan 2016-05-04 15:51:38 +02:00 committed by Alexander Block
parent 9bed9ac9f1
commit 49c3127b55
1 changed files with 2 additions and 2 deletions
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4
src/net.cpp
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@ -949,7 +949,7 @@ bool CConnman::AttemptToEvictConnection()
if (vEvictionCandidates.empty()) return false;
// Protect the 8 nodes with the best ping times.
// Protect the 8 nodes with the lowest minimum ping time.
// An attacker cannot manipulate this metric without physically moving nodes closer to the target.
std::sort(vEvictionCandidates.begin(), vEvictionCandidates.end(), ReverseCompareNodeMinPingTime);
vEvictionCandidates.erase(vEvictionCandidates.end() - std::min(8, static_cast<int>(vEvictionCandidates.size())), vEvictionCandidates.end());
@ -971,7 +971,7 @@ bool CConnman::AttemptToEvictConnection()
if (vEvictionCandidates.empty()) return false;
// Protect the half of the remaining nodes which have been connected the longest.
// This replicates the existing implicit behavior.
// This replicates the non-eviction implicit behavior, and precludes attacks that start later.
std::sort(vEvictionCandidates.begin(), vEvictionCandidates.end(), ReverseCompareNodeTimeConnected);
vEvictionCandidates.erase(vEvictionCandidates.end() - static_cast<int>(vEvictionCandidates.size() / 2), vEvictionCandidates.end());