lib, bgpd, nhrpd: Cleanup memory in lib/resolver on shutdown

This memory was not being cleaned up on shutdown.  Fix this.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>

bgpd/bgp_bmp.c

@@ -2884,6 +2884,12 @@ static int bmp_route_update(struct bgp *bgp, afi_t afi, safi_t safi,
 	return 0;
 }
 
+static int bgp_bmp_early_fini(void)
+{
+	resolver_terminate();
+
+	return 0;
+}
 
 static int bgp_bmp_module_init(void)
 {
@@ -2896,6 +2902,7 @@ static int bgp_bmp_module_init(void)
 	hook_register(bgp_inst_delete, bmp_bgp_del);
 	hook_register(frr_late_init, bgp_bmp_init);
 	hook_register(bgp_route_update, bmp_route_update);
+	hook_register(frr_early_fini, bgp_bmp_early_fini);
 	return 0;
 }
 

lib/resolver.c

@@ -335,3 +335,8 @@ void resolver_init(struct event_loop *tm)
 	install_element(CONFIG_NODE, &debug_resolver_cmd);
 	install_element(ENABLE_NODE, &debug_resolver_cmd);
 }
+
+void resolver_terminate(void)
+{
+	ares_destroy(state.channel);
+}

lib/resolver.h

@@ -23,6 +23,7 @@ struct resolver_query {
 };
 
 void resolver_init(struct event_loop *tm);
+void resolver_terminate(void);
 void resolver_resolve(struct resolver_query *query, int af, vrf_id_t vrf_id,
 		      const char *hostname,
 		      void (*cb)(struct resolver_query *, const char *, int,

nhrpd/nhrp_main.c

@@ -92,6 +92,8 @@ static void nhrp_request_stop(void)
 	nhrp_vc_terminate();
 
 	debugf(NHRP_DEBUG_COMMON, "Done.");
+
+	resolver_terminate();
 	frr_fini();
 
 	exit(0);