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p2p: give all hosts the same chance of being picked for connecting

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even if some run more than one node
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moneromooo 2020-10-27 13:18:40 +00:00 committed by moneromooo-monero
parent 4d855fcca7
commit df1061c87d
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GPG key ID: 686F07454D6CEFC3
1 changed files with 26 additions and 1 deletions
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27
src/p2p/net_node.inl
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@ -1436,13 +1436,28 @@ namespace nodetool
});
}
auto get_host_string = [](const epee::net_utils::network_address &address) {
#if BOOST_VERSION > 106600
if (address.get_type_id() == epee::net_utils::ipv6_network_address::get_type_id())
{
boost::asio::ip::address_v6 actual_ip = address.as<const epee::net_utils::ipv6_network_address>().ip();
if (actual_ip.is_v4_mapped())
{
boost::asio::ip::address_v4 v4ip = make_address_v4(boost::asio::ip::v4_mapped, actual_ip);
return epee::net_utils::ipv4_network_address(v4ip.to_uint(), 0).host_str();
}
}
#endif
return address.host_str();
};
std::unordered_set<std::string> hosts_added;
std::deque<size_t> filtered;
const size_t limit = use_white_list ? 20 : std::numeric_limits<size_t>::max();
for (int step = 0; step < 2; ++step)
{
bool skip_duplicate_class_B = step == 0;
size_t idx = 0, skipped = 0;
zone.m_peerlist.foreach (use_white_list, [&classB, &filtered, &idx, &skipped, skip_duplicate_class_B, limit, next_needed_pruning_stripe](const peerlist_entry &pe){
zone.m_peerlist.foreach (use_white_list, [&classB, &filtered, &idx, &skipped, skip_duplicate_class_B, limit, next_needed_pruning_stripe, &hosts_added, &get_host_string](const peerlist_entry &pe){
if (filtered.size() >= limit)
return false;
bool skip = false;
@ -1452,6 +1467,15 @@ namespace nodetool
uint32_t actual_ip = na.as<const epee::net_utils::ipv4_network_address>().ip();
skip = classB.find(actual_ip & 0x0000ffff) != classB.end();
}
// consider each host once, to avoid giving undue inflence to hosts running several nodes
if (!skip)
{
const auto i = hosts_added.find(get_host_string(pe.adr));
if (i != hosts_added.end())
skip = true;
}
if (skip)
++skipped;
else if (next_needed_pruning_stripe == 0 || pe.pruning_seed == 0)
@ -1459,6 +1483,7 @@ namespace nodetool
else if (next_needed_pruning_stripe == tools::get_pruning_stripe(pe.pruning_seed))
filtered.push_front(idx);
++idx;
hosts_added.insert(get_host_string(pe.adr));
return true;
});
if (skipped == 0 || !filtered.empty())