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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
View File

@ -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) {

6
src/addrman.h
View File

@ -231,7 +231,7 @@ protected:
//! Select an address to connect to.
//! nUnkBias determines how much to favor new addresses over tried ones (min=0, max=100)
CAddress Select_(int nUnkBias);
CAddress Select_();
#ifdef DEBUG_ADDRMAN
//! Perform consistency check. Returns an error code or zero.
@ -533,13 +533,13 @@ public:
* Choose an address to connect to.
* nUnkBias determines how much "new" entries are favored over "tried" ones (0-100).
*/
CAddress Select(int nUnkBias = 50)
CAddress Select()
{
CAddress addrRet;
{
LOCK(cs);
Check();
addrRet = Select_(nUnkBias);
addrRet = Select_();
Check();
}
return addrRet;

3
src/net.cpp
View File

@ -1221,8 +1221,7 @@ void ThreadOpenConnections()
int nTries = 0;
while (true)
{
// use an nUnkBias between 10 (no outgoing connections) and 90 (8 outgoing connections)
CAddress addr = addrman.Select(10 + min(nOutbound,8)*10);
CAddress addr = addrman.Select();
// if we selected an invalid address, restart
if (!addr.IsValid() || setConnected.count(addr.GetGroup()) || IsLocal(addr))