net: Load fixed seeds from reachable networks for which we don't have addresses

Previously, we'd only load fixed seeds if we'd not
know any addresses at all. This change makes it possible
to change -onlynet abruptly, e.g. from -onlynet=onion to
-onlynet=i2p and still find peers.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/net.h b/src/net.h
index 31d17ea76c..666e0f3b8a 100644
--- a/src/net.h
+++ b/src/net.h
@@ -39,6 +39,7 @@
 #include <memory>
 #include <optional>
 #include <thread>
+#include <unordered_set>
 #include <vector>
 
 class AddrMan;
@@ -970,6 +971,12 @@ private:
     void RecordBytesSent(uint64_t bytes) EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
 
     /**
+     Return reachable networks for which we have no addresses in addrman and therefore
+     may require loading fixed seeds.
+     */
+    std::unordered_set<Network> GetReachableEmptyNetworks() const;
+
+    /**
      * Return vector of current BLOCK_RELAY peers.
      */
     std::vector<CAddress> GetCurrentBlockRelayOnlyConns() const;