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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "common/c_internal.h"
#include "util/numeric.h"
#include "debug.h"
#include "log.h"
#include "porting.h"
#include "settings.h"
#include <algorithm> // std::find
std::string script_get_backtrace(lua_State *L)
{
lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_BACKTRACE);
lua_call(L, 0, 1);
std::string result = luaL_checkstring(L, -1);
lua_pop(L, 1);
return result;
}
int script_exception_wrapper(lua_State *L, lua_CFunction f)
{
try {
return f(L); // Call wrapped function and return result.
} catch (const char *s) { // Catch and convert exceptions.
lua_pushstring(L, s);
} catch (std::exception &e) {
lua_pushstring(L, e.what());
}
return lua_error(L); // Rethrow as a Lua error.
}
/*
* Note that we can't get tracebacks for LUA_ERRMEM or LUA_ERRERR (without
* hacking Lua internals). For LUA_ERRMEM, this is because memory errors will
* not execute the error handler, and by the time lua_pcall returns the
* execution stack will have already been unwound. For LUA_ERRERR, there was
* another error while trying to generate a backtrace from a LUA_ERRRUN. It is
* presumed there is an error with the internal Lua state and thus not possible
* to gather a coherent backtrace. Realistically, the best we can do here is
* print which C function performed the failing pcall.
*/
void script_error(lua_State *L, int pcall_result, const char *mod, const char *fxn)
{
if (pcall_result == 0)
return;
const char *err_type;
switch (pcall_result) {
case LUA_ERRRUN:
err_type = "Runtime";
break;
case LUA_ERRMEM:
err_type = "OOM";
break;
case LUA_ERRERR:
err_type = "Double fault";
break;
default:
err_type = "Unknown";
}
if (!mod)
mod = "??";
if (!fxn)
fxn = "??";
const char *err_descr = lua_tostring(L, -1);
if (!err_descr)
err_descr = "<no description>";
char buf[256];
porting::mt_snprintf(buf, sizeof(buf), "%s error from mod '%s' in callback %s(): ",
err_type, mod, fxn);
std::string err_msg(buf);
err_msg += err_descr;
if (pcall_result == LUA_ERRMEM) {
err_msg += "\nCurrent Lua memory usage: "
+ itos(lua_gc(L, LUA_GCCOUNT, 0) >> 10) + " MB";
}
throw LuaError(err_msg);
}
static void script_log_add_source(lua_State *L, std::string &message, int stack_depth)
{
lua_Debug ar;
if (lua_getstack(L, stack_depth, &ar)) {
FATAL_ERROR_IF(!lua_getinfo(L, "Sl", &ar), "lua_getinfo() failed");
message.append(" (at " + std::string(ar.short_src) + ":"
+ std::to_string(ar.currentline) + ")");
} else {
message.append(" (at ?:?)");
}
}
bool script_log_unique(lua_State *L, std::string message, std::ostream &log_to,
int stack_depth)
{
thread_local std::vector<u64> logged_messages;
script_log_add_source(L, message, stack_depth);
u64 hash = murmur_hash_64_ua(message.data(), message.length(), 0xBADBABE);
if (std::find(logged_messages.begin(), logged_messages.end(), hash)
== logged_messages.end()) {
logged_messages.emplace_back(hash);
log_to << message << std::endl;
return true;
}
return false;
}
DeprecatedHandlingMode get_deprecated_handling_mode()
{
static thread_local bool configured = false;
static thread_local DeprecatedHandlingMode ret = DeprecatedHandlingMode::Ignore;
// Only read settings on first call
if (!configured) {
std::string value = g_settings->get("deprecated_lua_api_handling");
if (value == "log") {
ret = DeprecatedHandlingMode::Log;
} else if (value == "error") {
ret = DeprecatedHandlingMode::Error;
}
configured = true;
}
return ret;
}
void log_deprecated(lua_State *L, std::string message, int stack_depth)
{
DeprecatedHandlingMode mode = get_deprecated_handling_mode();
if (mode == DeprecatedHandlingMode::Ignore)
return;
script_log_add_source(L, message, stack_depth);
warningstream << message << std::endl;
if (mode == DeprecatedHandlingMode::Error)
script_error(L, LUA_ERRRUN, NULL, NULL);
else
infostream << script_get_backtrace(L) << std::endl;
}
void call_string_dump(lua_State *L, int idx)
{
// Retrieve string.dump from insecure env to avoid it being tampered with
lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_GLOBALS_BACKUP);
if (!lua_isnil(L, -1))
lua_getfield(L, -1, "string");
else
lua_getglobal(L, "string");
lua_getfield(L, -1, "dump");
lua_remove(L, -2); // remove _G
lua_remove(L, -2); // remove 'string' table
lua_pushvalue(L, idx);
lua_call(L, 1, 1);
}
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