eapol: utilize IWD_MODULE

This converts eapol to using IWD modules. The init/exit APIs did need
to remain exposed for unit tests.

Netdev was updated to depend on eapol.

src/eapol.c

@@ -40,6 +40,7 @@
 #include "src/handshake.h"
 #include "src/watchlist.h"
 #include "src/erp.h"
+#include "src/iwd.h"
 
 static struct l_queue *state_machines;
 static struct l_queue *preauths;
@@ -2705,16 +2706,16 @@ void __eapol_set_config(struct l_settings *config)
 		eapol_4way_handshake_time = 5;
 }
 
-bool eapol_init()
+int eapol_init(void)
 {
 	state_machines = l_queue_new();
 	preauths = l_queue_new();
 	watchlist_init(&frame_watches, &eapol_frame_watch_ops);
 
-	return true;
+	return 0;
 }
 
-bool eapol_exit()
+void eapol_exit(void)
 {
 	if (!l_queue_isempty(state_machines))
 		l_warn("stale eapol state machines found");
@@ -2727,6 +2728,6 @@ bool eapol_exit()
 	l_queue_destroy(preauths, preauth_sm_destroy);
 
 	watchlist_destroy(&frame_watches);
-
-	return true;
 }
+
+IWD_MODULE(eapol, eapol_init, eapol_exit);

src/eapol.h

@@ -128,5 +128,5 @@ struct preauth_sm *eapol_preauth_start(const uint8_t *aa,
 					eapol_preauth_destroy_func_t destroy);
 void eapol_preauth_cancel(uint32_t ifindex);
 
-bool eapol_init();
+int eapol_init(void);
-bool eapol_exit();
+void eapol_exit(void);

src/main.c

@@ -482,14 +482,12 @@ int main(int argc, char *argv[])
 	dbus_init(dbus);
 
 	eap_init(eap_mtu);
-	eapol_init();
 
 	exit_status = l_main_run_with_signal(signal_handler, NULL);
 	plugin_exit();
 
 	iwd_modules_exit();
 
-	eapol_exit();
 	eap_exit();
 
 	if (nl80211) {

src/netdev.c

@@ -4850,3 +4850,4 @@ void netdev_shutdown(void)
 }
 
 IWD_MODULE(netdev, netdev_init, netdev_exit);
+IWD_MODULE_DEPENDS(netdev, eapol);