Added a token add/remove callback function to the manager

src/libstrongswan/plugins/pkcs11/pkcs11_manager.c

@@ -40,6 +40,16 @@ struct private_pkcs11_manager_t {
 	 * List of loaded libraries, as lib_entry_t
 	 */
 	linked_list_t *libs;
+
+	/**
+	 * Slot event callback function
+	 */
+	pkcs11_manager_token_event_t cb;
+
+	/**
+	 * Slot event user data
+	 */
+	void *data;
 };
 
 /**
@@ -170,11 +180,13 @@ static void handle_slot(lib_entry_t *entry, CK_SLOT_ID slot)
 		DBG1(DBG_CFG, "  found token in slot '%s':%lu (%s)",
 			 entry->name, slot, info.slotDescription);
 		handle_token(entry, slot);
+		entry->this->cb(entry->this->data, entry->lib, slot, TRUE);
 	}
 	else
 	{
 		DBG1(DBG_CFG, "token removed from slot '%s':%lu (%s)",
 			 entry->name, slot, info.slotDescription);
+		entry->this->cb(entry->this->data, entry->lib, slot, FALSE);
 	}
 }
 
@@ -250,7 +262,8 @@ METHOD(pkcs11_manager_t, destroy, void,
 /**
  * See header
  */
-pkcs11_manager_t *pkcs11_manager_create()
+pkcs11_manager_t *pkcs11_manager_create(pkcs11_manager_token_event_t cb,
+										void *data)
 {
 	private_pkcs11_manager_t *this;
 	enumerator_t *enumerator;
@@ -262,6 +275,8 @@ pkcs11_manager_t *pkcs11_manager_create()
 			.destroy = _destroy,
 		},
 		.libs = linked_list_create(),
+		.cb = cb,
+		.data = data,
 	);
 
 	enumerator = lib->settings->create_section_enumerator(lib->settings,

src/libstrongswan/plugins/pkcs11/pkcs11_manager.h

@@ -23,6 +23,22 @@
 
 typedef struct pkcs11_manager_t pkcs11_manager_t;
 
+#include <library.h>
+
+#include "pkcs11_library.h"
+
+/**
+ * Token event callback function.
+ *
+ * @param data		user supplied data, as passed to pkcs11_manager_create()
+ * @param p11		loaded PKCS#11 library token belongs to
+ * @param slot		slot number the event occured in
+ * @param add		TRUE if token was added to the slot, FALSE if removed
+ */
+typedef void (*pkcs11_manager_token_event_t)(void *data, pkcs11_library_t *p11,
+											 CK_SLOT_ID slot, bool add);
+
+
 /**
  * Manages multiple PKCS#11 libraries with hot pluggable slots
  */
@@ -37,6 +53,7 @@ struct pkcs11_manager_t {
 /**
  * Create a pkcs11_manager instance.
  */
-pkcs11_manager_t *pkcs11_manager_create();
+pkcs11_manager_t *pkcs11_manager_create(pkcs11_manager_token_event_t cb,
+										void *data);
 
 #endif /** PKCS11_MANAGER_H_ @}*/

src/libstrongswan/plugins/pkcs11/pkcs11_plugin.c

@@ -16,6 +16,7 @@
 #include "pkcs11_plugin.h"
 
 #include <library.h>
+#include <debug.h>
 
 #include "pkcs11_manager.h"
 
@@ -37,6 +38,14 @@ struct private_pkcs11_plugin_t {
 	pkcs11_manager_t *manager;
 };
 
+/**
+ * Token event callback function
+ */
+static void token_event_cb(private_pkcs11_plugin_t *this, pkcs11_library_t *p11,
+						   CK_SLOT_ID slot, bool add)
+{
+}
+
 METHOD(plugin_t, destroy, void,
 	private_pkcs11_plugin_t *this)
 {
@@ -53,8 +62,9 @@ plugin_t *pkcs11_plugin_create()
 
 	INIT(this,
 		.public.plugin.destroy = _destroy,
-		.manager = pkcs11_manager_create(),
 	);
 
+	this->manager = pkcs11_manager_create((void*)token_event_cb, this);
+
 	return &this->public.plugin;
 }