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/* Copyright (C) 2015-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
/*
* @internal These are forward decls to allow building modules with engine but without Lua.
*/
struct lua_State;
#include "lib/utils.h"
#include "lib/resolve.h"
#include "daemon/network.h"
/* @internal Array of file descriptors shorthand. */
typedef array_t(int) fd_array_t;
struct engine {
struct kr_context resolver;
struct network net;
module_array_t modules;
array_t(const struct kr_cdb_api *) backends;
fd_array_t ipc_set;
knot_mm_t *pool;
char *hostname;
struct lua_State *L;
char *moduledir;
};
int engine_init(struct engine *engine, knot_mm_t *pool);
void engine_deinit(struct engine *engine);
/** Perform a lua command within the sandbox.
*
* @return zero on success.
* The result will be returned on the lua stack - an error message in case of failure.
* http://www.lua.org/manual/5.1/manual.html#lua_pcall */
int engine_cmd(struct lua_State *L, const char *str, bool raw);
/** Execute current chunk in the sandbox */
int engine_pcall(struct lua_State *L, int argc);
int engine_ipc(struct engine *engine, const char *expr);
int engine_load_sandbox(struct engine *engine);
int engine_loadconf(struct engine *engine, const char *config_path);
int engine_load_defaults(struct engine *engine);
/** Start the lua engine and execute the config. */
int engine_start(struct engine *engine);
void engine_stop(struct engine *engine);
int engine_register(struct engine *engine, const char *name, const char *precedence, const char* ref);
int engine_unregister(struct engine *engine, const char *name);
void engine_lualib(struct engine *engine, const char *name, int (*lib_cb) (struct lua_State *));
/** Return engine light userdata. */
struct engine *engine_luaget(struct lua_State *L);
/** Set/get the per engine hostname */
char *engine_get_hostname(struct engine *engine);
int engine_set_hostname(struct engine *engine, const char *hostname);
/** Set/get the per engine moduledir */
char *engine_get_moduledir(struct engine *engine);
int engine_set_moduledir(struct engine *engine, const char *moduledir);
/** Load root hints from a zonefile (or config-time default if NULL).
*
* @return error message or NULL (statically allocated)
* @note exported to be usable from the hints module.
*/
KR_EXPORT
const char* engine_hint_root_file(struct kr_context *ctx, const char *file);
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