TNC: Allow TNC to be enabled dynamically

Previously, hostapd had to be started with at least one of the
configuration files enabling TNC for TNC to be usable. Change this to
allow TNC to be enabled when the first interface with TNC enabled gets
added during runtime.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/ap/hostapd.c

@@ -14,6 +14,7 @@
 #include "common/wpa_ctrl.h"
 #include "radius/radius_client.h"
 #include "radius/radius_das.h"
+#include "eap_server/tncs.h"
 #include "hostapd.h"
 #include "authsrv.h"
 #include "sta_info.h"
@@ -673,6 +674,13 @@ static int hostapd_setup_bss(struct hostapd_data *hapd, int first)
 	wpa_printf(MSG_DEBUG, "%s(hapd=%p (%s), first=%d)",
 		   __func__, hapd, hapd->conf->iface, first);
 
+#ifdef EAP_SERVER_TNC
+	if (hapd->conf->tnc && tncs_global_init() < 0) {
+		wpa_printf(MSG_ERROR, "Failed to initialize TNCS");
+		return -1;
+	}
+#endif /* EAP_SERVER_TNC */
+
 	if (hapd->started) {
 		wpa_printf(MSG_ERROR, "%s: Interface %s was already started",
 			   __func__, hapd->conf->iface);

src/eap_server/tncs.c

@@ -1115,6 +1115,9 @@ int tncs_global_init(void)
 {
 	struct tnc_if_imv *imv;
 
+	if (tncs_global_data)
+		return 0;
+
 	tncs_global_data = os_zalloc(sizeof(*tncs_global_data));
 	if (tncs_global_data == NULL)
 		return -1;