Revert alloc_str changes

This reverts commit fdead26ffe.
This reverts commit 3e2419ebe3.
This reverts commit 17ce69b47a.

src/libstrongswan/plugins/openssl/openssl_rsa_private_key.c

@@ -550,34 +550,36 @@ openssl_rsa_private_key_t *openssl_rsa_private_key_connect(key_type_t type,
 
 	if (!engine_id)
 	{
-		engine_id = lib->settings->alloc_str(lib->settings,
+		engine_id = lib->settings->get_str(lib->settings,
 						"libstrongswan.plugins.openssl.engine_id", "pkcs11");
 	}
 	engine = ENGINE_by_id(engine_id);
 	if (!engine)
 	{
 		DBG2(DBG_LIB, "engine '%s' is not available", engine_id);
-		goto engine_failed;
+		return NULL;
 	}
 	if (!ENGINE_init(engine))
 	{
 		DBG1(DBG_LIB, "failed to initialize engine '%s'", engine_id);
-		goto engine_failed;
+		ENGINE_free(engine);
+		return NULL;
 	}
 	if (!login(engine, keyid))
 	{
 		DBG1(DBG_LIB, "login to engine '%s' failed", engine_id);
-		goto engine_failed;
+		ENGINE_free(engine);
+		return NULL;
 	}
 	key = ENGINE_load_private_key(engine, keyname, NULL, NULL);
 	if (!key)
 	{
 		DBG1(DBG_LIB, "failed to load private key with ID '%s' from "
 			 "engine '%s'", keyname, engine_id);
-		goto engine_failed;
+		ENGINE_free(engine);
+		return NULL;
 	}
 	ENGINE_free(engine);
-	free(engine_id);
 
 	this = create_empty();
 	this->rsa = EVP_PKEY_get1_RSA(key);
@@ -592,12 +594,5 @@ openssl_rsa_private_key_t *openssl_rsa_private_key_connect(key_type_t type,
 #else /* OPENSSL_NO_ENGINE */
 	return NULL;
 #endif /* OPENSSL_NO_ENGINE */
-engine_failed:
-	if (engine)
-	{
-		ENGINE_free(engine);
-	}
-	free(engine_id);
-	return NULL;
 }
 

src/libstrongswan/plugins/pkcs11/pkcs11_manager.c

@@ -74,8 +74,7 @@ static void lib_entry_destroy(lib_entry_t *entry)
 	{
 		entry->job->cancel(entry->job);
 	}
-	DESTROY_IF(entry->lib);
-	free(entry->path);
+	entry->lib->destroy(entry->lib);
 	free(entry);
 }
 
@@ -366,12 +365,12 @@ pkcs11_manager_t *pkcs11_manager_create(pkcs11_manager_token_event_t cb,
 			.this = this,
 		);
 
-		entry->path = lib->settings->alloc_str(lib->settings,
+		entry->path = lib->settings->get_str(lib->settings,
 				"libstrongswan.plugins.pkcs11.modules.%s.path", NULL, module);
 		if (!entry->path)
 		{
 			DBG1(DBG_CFG, "PKCS11 module '%s' lacks library path", module);
-			lib_entry_destroy(entry);
+			free(entry);
 			continue;
 		}
 		entry->lib = pkcs11_library_create(module, entry->path,
@@ -380,7 +379,7 @@ pkcs11_manager_t *pkcs11_manager_create(pkcs11_manager_token_event_t cb,
 							FALSE, module));
 		if (!entry->lib)
 		{
-			lib_entry_destroy(entry);
+			free(entry);
 			continue;
 		}
 		this->libs->insert_last(this->libs, entry);

src/libstrongswan/settings.c

@@ -444,21 +444,6 @@ METHOD(settings_t, get_str, char*,
 	return def;
 }
 
-METHOD(settings_t, alloc_str, char*,
-	private_settings_t *this, char *key, char *def, ...)
-{
-	char *value;
-	va_list args;
-
-	va_start(args, def);
-	/* additional lock to savely strdup */
-	this->lock->read_lock(this->lock);
-	value = strdupnull(find_value(this, this->top, key, args) ?: def);
-	this->lock->unlock(this->lock);
-	va_end(args);
-	return value;
-}
-
 /**
  * Described in header
  */
@@ -1207,7 +1192,6 @@ settings_t *settings_create(char *file)
 	INIT(this,
 		.public = {
 			.get_str = _get_str,
-			.alloc_str = _alloc_str,
 			.get_int = _get_int,
 			.get_double = _get_double,
 			.get_time = _get_time,

src/libstrongswan/settings.h

@@ -146,31 +146,13 @@ struct settings_t {
 	/**
 	 * Get a settings value as a string.
 	 *
-	 * This functions returns a string held by settings_t. It is not thread
-	 * save, a thread calling load_files might free the returned string at
-	 * any time. Use the thread save alloc_str if a different thread might
-	 * call load_files() or set_str().
-	 *
 	 * @param key		key including sections, printf style format
 	 * @param def		value returned if key not found
 	 * @param ...		argument list for key
-	 * @return			value pointing to internal string, not to be freed
+	 * @return			value pointing to internal string
 	 */
 	char* (*get_str)(settings_t *this, char *key, char *def, ...);
 
-	/**
-	 * Get a settings value as a string, thread save variant.
-	 *
-	 * This function is identical to get_str, but is thread save. It allocates
-	 * a copy for the returned string which must be freed.
-	 *
-	 * @param key		key including sections, printf style format
-	 * @param def		value returned if key not found
-	 * @param ...		argument list for key
-	 * @return			allocated string, to be free
-	 */
-	char* (*alloc_str)(settings_t *this, char *key, char *def, ...);
-
 	/**
 	 * Get a boolean yes|no, true|false value.
 	 *