From 7357fe161bf7d0dab8318c6318700864213bad61 Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Fri, 25 May 2018 12:34:52 +0100
Subject: [PATCH] p2p: warn when no incoming connections are seen for a while

---
 src/p2p/net_node.h   |  2 ++
 src/p2p/net_node.inl | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/src/p2p/net_node.h b/src/p2p/net_node.h
index 4606f66ee..077296acd 100644
--- a/src/p2p/net_node.h
+++ b/src/p2p/net_node.h
@@ -244,6 +244,7 @@ namespace nodetool
 
     bool check_connection_and_handshake_with_peer(const epee::net_utils::network_address& na, uint64_t last_seen_stamp);
     bool gray_peerlist_housekeeping();
+    bool check_incoming_connections();
 
     void kill() { ///< will be called e.g. from deinit()
       _info("Killing the net_node");
@@ -307,6 +308,7 @@ namespace nodetool
     epee::math_helper::once_a_time_seconds<1> m_connections_maker_interval;
     epee::math_helper::once_a_time_seconds<60*30, false> m_peerlist_store_interval;
     epee::math_helper::once_a_time_seconds<60> m_gray_peerlist_housekeeping_interval;
+    epee::math_helper::once_a_time_seconds<900, false> m_incoming_connections_interval;
 
     std::string m_bind_ip;
     std::string m_port;
diff --git a/src/p2p/net_node.inl b/src/p2p/net_node.inl
index b28d8b36d..2ed7ec891 100755
--- a/src/p2p/net_node.inl
+++ b/src/p2p/net_node.inl
@@ -1279,6 +1279,20 @@ namespace nodetool
     m_connections_maker_interval.do_call(boost::bind(&node_server<t_payload_net_handler>::connections_maker, this));
     m_gray_peerlist_housekeeping_interval.do_call(boost::bind(&node_server<t_payload_net_handler>::gray_peerlist_housekeeping, this));
     m_peerlist_store_interval.do_call(boost::bind(&node_server<t_payload_net_handler>::store_config, this));
+    m_incoming_connections_interval.do_call(boost::bind(&node_server<t_payload_net_handler>::check_incoming_connections, this));
+    return true;
+  }
+  //-----------------------------------------------------------------------------------
+  template<class t_payload_net_handler>
+  bool node_server<t_payload_net_handler>::check_incoming_connections()
+  {
+    if (m_offline || m_hide_my_port)
+      return true;
+    if (get_incoming_connections_count() == 0)
+    {
+      const el::Level level = el::Level::Warning;
+      MCLOG_RED(level, "global", "No incoming connections - check firewalls/routers allow port " << get_this_peer_port());
+    }
     return true;
   }
   //-----------------------------------------------------------------------------------