90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/* Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#pragma once
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#include "daemon/engine.h"
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#include "daemon/worker.h" /* the_worker is often useful */
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#include <lua.h>
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#include <lauxlib.h>
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/* It may happen that include files are messed up and we're hitting a header
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* e.g. from vanilla Lua. Even 5.1 won't work due to missing luaL_traceback() in <lauxlib.h>. */
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#if (LUA_VERSION_NUM) != 501 || !defined(LUA_LJDIR)
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#error "Incorrect Lua version in #include <lua.h> - LuaJIT compatible with Lua 5.1 is required"
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#endif
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/** Useful to stringify macros into error strings. */
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#define STR(s) STRINGIFY_TOKEN(s)
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#define STRINGIFY_TOKEN(s) #s
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/** Check lua table at the top of the stack for allowed keys.
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* \param keys NULL-terminated array of 0-terminated strings
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* \return NULL if passed or the offending string (pushed on top of lua stack)
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* \note Future work: if non-NULL is returned, there's extra stuff on the lua stack.
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* \note Brute-force complexity: table length * summed length of keys.
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*/
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const char * lua_table_checkindices(lua_State *L, const char *keys[]);
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/** If the value at the top of the stack isn't a table, make it a single-element list. */
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static inline void lua_listify(lua_State *L)
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{
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if (lua_istable(L, -1))
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return;
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lua_createtable(L, 1, 0);
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lua_insert(L, lua_gettop(L) - 1); /* swap the top two stack elements */
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lua_pushinteger(L, 1);
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lua_insert(L, lua_gettop(L) - 1); /* swap the top two stack elements */
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lua_settable(L, -3);
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}
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/** Throw a formatted lua error.
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*
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* The message will get prefixed by "ERROR: " and supplemented by stack trace.
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* \return never! It calls lua_error().
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*
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* Example:
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ERROR: not a valid pin_sha256: 'a1Z/3ek=', raw length 5 instead of 32
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stack traceback:
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[C]: in function 'tls_client'
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/PathToPREFIX/lib/kdns_modules/policy.lua:175: in function 'TLS_FORWARD'
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/PathToConfig.lua:46: in main chunk
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*/
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KR_PRINTF(2) KR_NORETURN KR_COLD
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void lua_error_p(lua_State *L, const char *fmt, ...);
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/** @internal Annotate for static checkers. */
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KR_NORETURN int lua_error(lua_State *L);
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/** Shortcut for common case. */
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static inline void lua_error_maybe(lua_State *L, int err)
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{
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if (err) lua_error_p(L, "%s", kr_strerror(err));
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}
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static inline int execute_callback(lua_State *L, int argc)
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{
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int ret = engine_pcall(L, argc);
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if (ret != 0) {
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kr_log_error(SYSTEM, "error: %s\n", lua_tostring(L, -1));
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}
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/* Clear the stack, there may be event a/o anything returned */
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lua_settop(L, 0);
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return ret;
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}
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/** Push a pointer as heavy/full userdata.
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*
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* It's useful as a replacement of lua_pushlightuserdata(),
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* but note that it behaves differently in lua (converts to pointer-to-pointer).
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*/
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static inline void lua_pushpointer(lua_State *L, void *p)
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{
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void **addr = lua_newuserdata(L, sizeof(void *));
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kr_require(addr);
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memcpy(addr, &p, sizeof(void *));
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}
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