diff --git a/src/net.h b/src/net.h --- a/src/net.h +++ b/src/net.h @@ -198,7 +198,9 @@ * attacks. By not relaying transactions or addresses, these connections * are harder to detect by a third party, thus helping obfuscate the * network topology. We automatically attempt to open - * MAX_BLOCK_RELAY_ONLY_CONNECTIONS using addresses from our AddrMan. + * MAX_BLOCK_RELAY_ONLY_ANCHORS using addresses from our anchors.dat. Then + * addresses from our AddrMan if MAX_BLOCK_RELAY_ONLY_CONNECTIONS + * isn't reached yet. */ BLOCK_RELAY, diff --git a/src/net.cpp b/src/net.cpp --- a/src/net.cpp +++ b/src/net.cpp @@ -2163,10 +2163,12 @@ ConnectionType conn_type = ConnectionType::OUTBOUND_FULL_RELAY; int64_t nTime = GetTimeMicros(); + bool anchor = false; bool fFeeler = false; // Determine what type of connection to open. Opening - // OUTBOUND_FULL_RELAY connections gets the highest priority until we + // BLOCK_RELAY connections to addresses from anchors.dat gets the + // highest priority. Then we open OUTBOUND_FULL_RELAY priority until we // meet our full-relay capacity. Then we open BLOCK_RELAY connection // until we hit our block-relay-only peer limit. // GetTryNewOutboundPeer() gets set when a stale tip is detected, so we @@ -2174,7 +2176,11 @@ // these conditions are met, check the nNextFeeler timer to decide if // we should open a FEELER. - if (nOutboundFullRelay < m_max_outbound_full_relay) { + if (!m_anchors.empty() && + (nOutboundBlockRelay < m_max_outbound_block_relay)) { + conn_type = ConnectionType::BLOCK_RELAY; + anchor = true; + } else if (nOutboundFullRelay < m_max_outbound_full_relay) { // OUTBOUND_FULL_RELAY } else if (nOutboundBlockRelay < m_max_outbound_block_relay) { conn_type = ConnectionType::BLOCK_RELAY; @@ -2194,6 +2200,20 @@ int64_t nANow = GetAdjustedTime(); int nTries = 0; while (!interruptNet) { + if (anchor && !m_anchors.empty()) { + const CAddress addr = m_anchors.back(); + m_anchors.pop_back(); + if (!addr.IsValid() || IsLocal(addr) || !IsReachable(addr) || + !HasAllDesirableServiceFlags(addr.nServices) || + setConnected.count(addr.GetGroup(addrman.m_asmap))) { + continue; + } + addrConnect = addr; + LogPrint(BCLog::NET, + "Trying to make an anchor connection to %s\n", + addrConnect.ToString()); + break; + } // If we didn't find an appropriate destination after trying 100 // addresses fetched from addrman, stop this loop, and let the outer // loop run again (which sleeps, adds seed nodes, recalculates