[net] Seed addr cache randomizer with port from binding address

Author: dergoegge

src/net.cpp

@@ -2801,6 +2801,9 @@ std::vector<CAddress> CConnman::GetAddresses(CNode& requestor, size_t max_addres
     uint64_t cache_id = GetDeterministicRandomizer(RANDOMIZER_ID_ADDRCACHE)
         .Write(requestor.ConnectedThroughNetwork())
         .Write(local_socket_bytes.data(), local_socket_bytes.size())
+        // For outbound connections, the port of the bound address is randomly
+        // assigned by the OS and would therefore not be useful for seeding.
+        .Write(requestor.IsInboundConn() ? requestor.addrBind.GetPort() : 0)
         .Finalize();
     const auto current_time = GetTime<std::chrono::microseconds>();
     auto r = m_addr_response_caches.emplace(cache_id, CachedAddrResponse{});