netcfg: add sockets/list node for active connection count

netstack/src/scheme/mod.rs

@@ -170,6 +170,7 @@ impl Smolnetd {
                 netcfg_file,
                 Rc::clone(&route_table),
                 Rc::clone(&devices),
+                Rc::clone(&socket_set),
             )?,
         })
     }

netstack/src/scheme/netcfg/mod.rs

@@ -26,7 +26,7 @@ use crate::router::route_table::{RouteTable, Rule};
 
 use self::nodes::*;
 use self::notifier::*;
-use super::{post_fevent, Interface};
+use super::{post_fevent, Interface, SocketSet};
 
 const WRITE_BUFFER_MAX_SIZE: usize = 0xffff;
 
@@ -71,8 +71,18 @@ fn mk_root_node(
     dns_config: DNSConfigRef,
     route_table: Rc<RefCell<RouteTable>>,
     devices: Rc<RefCell<DeviceList>>,
+    socket_set: Rc<RefCell<SocketSet>>,
 ) -> CfgNodeRef {
     cfg_node! {
+        "sockets" => {
+            "list" => {
+                ro [socket_set] || {
+                    let set = socket_set.borrow();
+                    let mut out = format!("sockets: {}\n", set.iter().count());
+                    out
+                }
+            }
+        },
         "resolv" => {
             "nameserver" => {
                 rw [dns_config, notifier] (Option<Ipv4Address>, None)
@@ -337,6 +347,7 @@ impl NetCfgScheme {
         scheme_file: Socket,
         route_table: Rc<RefCell<RouteTable>>,
         devices: Rc<RefCell<DeviceList>>,
+        socket_set: Rc<RefCell<SocketSet>>,
     ) -> Result<NetCfgScheme> {
         let notifier = Notifier::new_ref();
         let dns_config = Rc::new(RefCell::new(DNSConfig {
@@ -351,6 +362,7 @@ impl NetCfgScheme {
                 dns_config,
                 route_table,
                 devices,
+                socket_set,
             ),
             notifier,
         };