p2p: delay IGP probing on startup

We might have external access without having to do this

src/p2p/net_node.cpp

@@ -135,6 +135,7 @@ namespace nodetool
     const command_line::arg_descriptor<bool> arg_no_sync = {"no-sync", "Don't synchronize the blockchain with other peers", false};
 
     const command_line::arg_descriptor<bool>        arg_no_igd  = {"no-igd", "Disable UPnP port mapping"};
+    const command_line::arg_descriptor<std::string> arg_igd = {"igd", "UPnP port mapping (disabled, enabled, delayed)", "delayed"};
     const command_line::arg_descriptor<int64_t>     arg_out_peers = {"out-peers", "set max number of out peers", -1};
     const command_line::arg_descriptor<int64_t>     arg_in_peers = {"in-peers", "set max number of in peers", -1};
     const command_line::arg_descriptor<int> arg_tos_flag = {"tos-flag", "set TOS flag", -1};

src/p2p/net_node.h

@@ -205,6 +205,13 @@ namespace nodetool
       }
     };
 
+    enum igd_t
+    {
+      no_igd,
+      igd,
+      delayed_igd,
+    };
+
   public:
     typedef t_payload_net_handler payload_net_handler;
 
@@ -214,7 +221,7 @@ namespace nodetool
         m_rpc_port(0),
         m_allow_local_ip(false),
         m_hide_my_port(false),
-        m_no_igd(false),
+        m_igd(no_igd),
         m_offline(false),
         m_save_graph(false),
         is_closing(false),
@@ -417,7 +424,7 @@ namespace nodetool
     uint16_t m_rpc_port;
     bool m_allow_local_ip;
     bool m_hide_my_port;
-    bool m_no_igd;
+    igd_t m_igd;
     bool m_offline;
     std::atomic<bool> m_save_graph;
     std::atomic<bool> is_closing;
@@ -492,6 +499,7 @@ namespace nodetool
     extern const command_line::arg_descriptor<bool> arg_no_sync;
 
     extern const command_line::arg_descriptor<bool>        arg_no_igd;
+    extern const command_line::arg_descriptor<std::string> arg_igd;
     extern const command_line::arg_descriptor<bool>        arg_offline;
     extern const command_line::arg_descriptor<int64_t>     arg_out_peers;
     extern const command_line::arg_descriptor<int64_t>     arg_in_peers;

src/p2p/net_node.inl

@@ -105,6 +105,7 @@ namespace nodetool
     command_line::add_arg(desc, arg_p2p_hide_my_port);
     command_line::add_arg(desc, arg_no_sync);
     command_line::add_arg(desc, arg_no_igd);
+    command_line::add_arg(desc, arg_igd);
     command_line::add_arg(desc, arg_out_peers);
     command_line::add_arg(desc, arg_in_peers);
     command_line::add_arg(desc, arg_tos_flag);
@@ -257,7 +258,35 @@ namespace nodetool
     public_zone.m_can_pingback = true;
     m_external_port = command_line::get_arg(vm, arg_p2p_external_port);
     m_allow_local_ip = command_line::get_arg(vm, arg_p2p_allow_local_ip);
-    m_no_igd = command_line::get_arg(vm, arg_no_igd);
+    const bool has_no_igd = command_line::get_arg(vm, arg_no_igd);
+    const std::string sigd = command_line::get_arg(vm, arg_igd);
+    if (sigd == "enabled")
+    {
+      if (has_no_igd)
+      {
+        MFATAL("Cannot have both --" << arg_no_igd.name << " and --" << arg_igd.name << " enabled");
+        return false;
+      }
+      m_igd = igd;
+    }
+    else if (sigd == "disabled")
+    {
+      m_igd =  no_igd;
+    }
+    else if (sigd == "delayed")
+    {
+      if (has_no_igd && !command_line::is_arg_defaulted(vm, arg_igd))
+      {
+        MFATAL("Cannot have both --" << arg_no_igd.name << " and --" << arg_igd.name << " delayed");
+        return false;
+      }
+      m_igd = has_no_igd ? no_igd : delayed_igd;
+    }
+    else
+    {
+      MFATAL("Invalid value for --" << arg_igd.name << ", expected enabled, disabled or delayed");
+      return false;
+    }
     m_offline = command_line::get_arg(vm, cryptonote::arg_offline);
 
     if (command_line::has_arg(vm, arg_p2p_add_peer))
@@ -682,7 +711,7 @@ namespace nodetool
       MDEBUG("External port defined as " << m_external_port);
 
     // add UPnP port mapping
-    if(!m_no_igd)
+    if(m_igd == igd)
       add_upnp_port_mapping(m_listening_port);
 
     return res;
@@ -776,7 +805,7 @@ namespace nodetool
       for(auto& zone : m_network_zones)
         zone.second.m_net_server.deinit_server();
       // remove UPnP port mapping
-      if(!m_no_igd)
+      if(m_igd == igd)
         delete_upnp_port_mapping(m_listening_port);
     }
     return store_config();
@@ -1580,11 +1609,20 @@ namespace nodetool
         MGINFO("Incoming connections disabled, enable them for full connectivity");
       }
       else
+      {
+        if (m_igd == delayed_igd)
+        {
+          MWARNING("No incoming connections, trying to setup IGD");
+          add_upnp_port_mapping(m_listening_port);
+          m_igd = igd;
+        }
+        else
         {
           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;
   }
   //-----------------------------------------------------------------------------------