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/* Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include <dirent.h>
#include <lua.h>
#include <lauxlib.h>
#include <string.h>
const char * lua_table_checkindices(lua_State *L, const char *keys[])
{
/* Iterate over table at the top of the stack.
* http://www.lua.org/manual/5.1/manual.html#lua_next */
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) {
lua_pop(L, 1); /* we don't need the value */
/* We need to copy the key, as _tostring() confuses _next().
* https://www.lua.org/manual/5.1/manual.html#lua_tolstring */
lua_pushvalue(L, -1);
const char *key = lua_tostring(L, -1);
if (!key)
return "<NON-STRING_INDEX>";
for (const char **k = keys; ; ++k) {
if (*k == NULL)
return key;
if (strcmp(*k, key) == 0)
break;
}
}
return NULL;
}
/** Return table listing filenames in a given directory (ls -A). */
static int kluautil_list_dir(lua_State *L)
{
lua_newtable(L); // empty table even on errors
const char *path = lua_tolstring(L, 1, NULL);
if (!path) return 1;
DIR *dir = opendir(path);
if (!dir) return 1;
struct dirent *entry;
int lua_i = 1;
while ((entry = readdir(dir)) != NULL) {
if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) {
lua_pushstring(L, entry->d_name);
lua_rawseti(L, -2, lua_i++);
}
}
closedir(dir);
return 1;
}
/* Each of these just creates the correspondingly named lua table of functions. */
int kr_bindings_cache (lua_State *L); /* ./cache.c */
int kr_bindings_event (lua_State *L); /* ./event.c */
int kr_bindings_modules (lua_State *L); /* ./modules.c */
int kr_bindings_net (lua_State *L); /* ./net.c */
int kr_bindings_worker (lua_State *L); /* ./worker.c */
void kr_bindings_register(lua_State *L)
{
kr_bindings_cache(L);
kr_bindings_event(L);
kr_bindings_modules(L);
kr_bindings_net(L);
kr_bindings_worker(L);
/* Finally some lua utils *written in C*, not really a binding. */
lua_register(L, "kluautil_list_dir", kluautil_list_dir);
}
void lua_error_p(lua_State *L, const char *fmt, ...)
{
/* Add a stack trace and throw the result as a lua error. */
luaL_traceback(L, L, "error occurred here (config filename:lineno is at the bottom, if config is involved):", 0);
/* Push formatted custom message, prepended with "ERROR: ". */
lua_pushliteral(L, "\nERROR: ");
{
va_list args;
va_start(args, fmt);
lua_pushvfstring(L, fmt, args);
va_end(args);
}
lua_concat(L, 3);
lua_error(L);
/* TODO: we might construct a little more friendly trace by using luaL_where().
* In particular, in case the error happens in a function that was called
* directly from a config file (the most common case), there isn't much need
* to format the trace in this heavy way. */
}
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