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Added feeler connections increasing good addrs in the tried table.

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Tests if addresses are online or offline by briefly connecting to them. These short lived connections are referred to as feeler connections. Feeler connections are designed to increase the number of fresh online addresses in tried by selecting and connecting to addresses in new. One feeler connection is attempted on average once every two minutes.

This change was suggested as Countermeasure 4 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:
Ethan Heilman
2016-06-17 00:10:07 -04:00
committed by Pieter Wuille
parent 1db3352cc6
commit 2611ad79a5
4 changed files with 83 additions and 9 deletions
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22
src/test/net_tests.cpp
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@@ -142,4 +142,26 @@ BOOST_AUTO_TEST_CASE(caddrdb_read_corrupted)
BOOST_CHECK(addrman2.size() == 0);
}
BOOST_AUTO_TEST_CASE(cnode_simple_test)
{
SOCKET hSocket = INVALID_SOCKET;
in_addr ipv4Addr;
ipv4Addr.s_addr = 0xa0b0c001;
CAddress addr = CAddress(CService(ipv4Addr, 7777), NODE_NETWORK);
std::string pszDest = "";
bool fInboundIn = false;
// Test that fFeeler is false by default.
CNode* pnode1 = new CNode(hSocket, addr, pszDest, fInboundIn);
BOOST_CHECK(pnode1->fInbound == false);
BOOST_CHECK(pnode1->fFeeler == false);
fInboundIn = true;
CNode* pnode2 = new CNode(hSocket, addr, pszDest, fInboundIn);
BOOST_CHECK(pnode2->fInbound == true);
BOOST_CHECK(pnode2->fFeeler == false);
}
BOOST_AUTO_TEST_SUITE_END()