aboutsummaryrefslogtreecommitdiff
path: root/src/script/cpp_api/s_async.cpp
blob: ef84d5037531636c7ddde953a1face36709cb161 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
/*
Minetest
Copyright (C) 2013 sapier, <sapier AT gmx DOT net>

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 <stdio.h>
#include <stdlib.h>

extern "C" {
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
}

#include "server.h"
#include "s_async.h"
#include "log.h"
#include "filesys.h"
#include "porting.h"
#include "common/c_internal.h"

/******************************************************************************/
AsyncEngine::AsyncEngine() :
	initDone(false),
	jobIdCounter(0)
{
}

/******************************************************************************/
AsyncEngine::~AsyncEngine()
{

	// Request all threads to stop
	for (std::vector<AsyncWorkerThread *>::iterator it = workerThreads.begin();
			it != workerThreads.end(); it++) {
		(*it)->Stop();
	}


	// Wake up all threads
	for (std::vector<AsyncWorkerThread *>::iterator it = workerThreads.begin();
			it != workerThreads.end(); it++) {
		jobQueueCounter.Post();
	}

	// Wait for threads to finish
	for (std::vector<AsyncWorkerThread *>::iterator it = workerThreads.begin();
			it != workerThreads.end(); it++) {
		(*it)->Wait();
	}

	// Force kill all threads
	for (std::vector<AsyncWorkerThread *>::iterator it = workerThreads.begin();
			it != workerThreads.end(); it++) {
		(*it)->Kill();
		delete *it;
	}

	jobQueueMutex.Lock();
	jobQueue.clear();
	jobQueueMutex.Unlock();
	workerThreads.clear();
}

/******************************************************************************/
bool AsyncEngine::registerFunction(const char* name, lua_CFunction func)
{
	if (initDone) {
		return false;
	}
	functionList[name] = func;
	return true;
}

/******************************************************************************/
void AsyncEngine::initialize(unsigned int numEngines)
{
	initDone = true;

	for (unsigned int i = 0; i < numEngines; i++) {
		AsyncWorkerThread *toAdd = new AsyncWorkerThread(this, i);
		workerThreads.push_back(toAdd);
		toAdd->Start();
	}
}

/******************************************************************************/
unsigned int AsyncEngine::queueAsyncJob(std::string func, std::string params)
{
	jobQueueMutex.Lock();
	LuaJobInfo toAdd;
	toAdd.id = jobIdCounter++;
	toAdd.serializedFunction = func;
	toAdd.serializedParams = params;

	jobQueue.push_back(toAdd);

	jobQueueCounter.Post();

	jobQueueMutex.Unlock();

	return toAdd.id;
}

/******************************************************************************/
LuaJobInfo AsyncEngine::getJob()
{
	jobQueueCounter.Wait();
	jobQueueMutex.Lock();

	LuaJobInfo retval;
	retval.valid = false;

	if (!jobQueue.empty()) {
		retval = jobQueue.front();
		jobQueue.pop_front();
		retval.valid = true;
	}
	jobQueueMutex.Unlock();

	return retval;
}

/******************************************************************************/
void AsyncEngine::putJobResult(LuaJobInfo result)
{
	resultQueueMutex.Lock();
	resultQueue.push_back(result);
	resultQueueMutex.Unlock();
}

/******************************************************************************/
void AsyncEngine::step(lua_State *L, int errorhandler)
{
	lua_getglobal(L, "core");
	resultQueueMutex.Lock();
	while (!resultQueue.empty()) {
		LuaJobInfo jobDone = resultQueue.front();
		resultQueue.pop_front();

		lua_getfield(L, -1, "async_event_handler");

		if (lua_isnil(L, -1)) {
			assert("Async event handler does not exist!" == 0);
		}

		luaL_checktype(L, -1, LUA_TFUNCTION);

		lua_pushinteger(L, jobDone.id);
		lua_pushlstring(L, jobDone.serializedResult.data(),
				jobDone.serializedResult.size());

		if (lua_pcall(L, 2, 0, errorhandler)) {
			script_error(L);
		}
	}
	resultQueueMutex.Unlock();
	lua_pop(L, 1); // Pop core
}

/******************************************************************************/
void AsyncEngine::pushFinishedJobs(lua_State* L) {
	// Result Table
	resultQueueMutex.Lock();

	unsigned int index = 1;
	lua_createtable(L, resultQueue.size(), 0);
	int top = lua_gettop(L);

	while (!resultQueue.empty()) {
		LuaJobInfo jobDone = resultQueue.front();
		resultQueue.pop_front();

		lua_createtable(L, 0, 2);  // Pre-allocate space for two map fields
		int top_lvl2 = lua_gettop(L);

		lua_pushstring(L, "jobid");
		lua_pushnumber(L, jobDone.id);
		lua_settable(L, top_lvl2);

		lua_pushstring(L, "retval");
		lua_pushlstring(L, jobDone.serializedResult.data(),
			jobDone.serializedResult.size());
		lua_settable(L, top_lvl2);

		lua_rawseti(L, top, index++);
	}

	resultQueueMutex.Unlock();
}

/******************************************************************************/
void AsyncEngine::prepareEnvironment(lua_State* L, int top)
{
	for (std::map<std::string, lua_CFunction>::iterator it = functionList.begin();
			it != functionList.end(); it++) {
		lua_pushstring(L, it->first.c_str());
		lua_pushcfunction(L, it->second);
		lua_settable(L, top);
	}
}

/******************************************************************************/
AsyncWorkerThread::AsyncWorkerThread(AsyncEngine* jobDispatcher,
		unsigned int threadNum) :
	ScriptApiBase(),
	jobDispatcher(jobDispatcher),
	threadnum(threadNum)
{
	lua_State *L = getStack();

	// Prepare job lua environment
	lua_getglobal(L, "core");
	int top = lua_gettop(L);

	// Push builtin initialization type
	lua_pushstring(L, "async");
	lua_setglobal(L, "INIT");

	jobDispatcher->prepareEnvironment(L, top);
}

/******************************************************************************/
AsyncWorkerThread::~AsyncWorkerThread()
{
	assert(IsRunning() == false);
}

/******************************************************************************/
void* AsyncWorkerThread::Thread()
{
	ThreadStarted();

	// Register thread for error logging
	char number[21];
	snprintf(number, sizeof(number), "%d", threadnum);
	log_register_thread(std::string("AsyncWorkerThread_") + number);

	porting::setThreadName((std::string("AsyncWorkTh_") + number).c_str());

	lua_State *L = getStack();

	std::string script = getServer()->getBuiltinLuaPath() + DIR_DELIM + "init.lua";
	if (!loadScript(script)) {
		errorstream
			<< "AsyncWorkderThread execution of async base environment failed!"
			<< std::endl;
		abort();
	}

	lua_getglobal(L, "core");
	if (lua_isnil(L, -1)) {
		errorstream << "Unable to find core within async environment!";
		abort();
	}

	// Main loop
	while (!StopRequested()) {
		// Wait for job
		LuaJobInfo toProcess = jobDispatcher->getJob();

		if (toProcess.valid == false || StopRequested()) {
			continue;
		}

		lua_getfield(L, -1, "job_processor");
		if (lua_isnil(L, -1)) {
			errorstream << "Unable to get async job processor!" << std::endl;
			abort();
		}

		luaL_checktype(L, -1, LUA_TFUNCTION);

		// Call it
		lua_pushlstring(L,
				toProcess.serializedFunction.data(),
				toProcess.serializedFunction.size());
		lua_pushlstring(L,
				toProcess.serializedParams.data(),
				toProcess.serializedParams.size());

		if (lua_pcall(L, 2, 1, m_errorhandler)) {
			scriptError();
			toProcess.serializedResult = "";
		} else {
			// Fetch result
			size_t length;
			const char *retval = lua_tolstring(L, -1, &length);
			toProcess.serializedResult = std::string(retval, length);
		}

		lua_pop(L, 1);  // Pop retval

		// Put job result
		jobDispatcher->putJobResult(toProcess);
	}

	lua_pop(L, 1);  // Pop core

	log_deregister_thread();

	return 0;
}

(L, old_globals, "io"); lua_newtable(L); copy_safe(L, io_whitelist, sizeof(io_whitelist)); // And replace unsafe ones SECURE_API(io, open); SECURE_API(io, input); SECURE_API(io, output); SECURE_API(io, lines); lua_setglobal(L, "io"); lua_pop(L, 1); // Pop old IO // Copy safe OS functions lua_getfield(L, old_globals, "os"); lua_newtable(L); copy_safe(L, os_whitelist, sizeof(os_whitelist)); // And replace unsafe ones SECURE_API(os, remove); SECURE_API(os, rename); lua_setglobal(L, "os"); lua_pop(L, 1); // Pop old OS // Copy safe debug functions lua_getfield(L, old_globals, "debug"); lua_newtable(L); copy_safe(L, debug_whitelist, sizeof(debug_whitelist)); lua_setglobal(L, "debug"); lua_pop(L, 1); // Pop old debug // Copy safe package fields lua_getfield(L, old_globals, "package"); lua_newtable(L); copy_safe(L, package_whitelist, sizeof(package_whitelist)); lua_setglobal(L, "package"); lua_pop(L, 1); // Pop old package #if USE_LUAJIT // Copy safe jit functions, if they exist lua_getfield(L, -1, "jit"); if (!lua_isnil(L, -1)) { lua_newtable(L); copy_safe(L, jit_whitelist, sizeof(jit_whitelist)); lua_setglobal(L, "jit"); } lua_pop(L, 1); // Pop old jit #endif lua_pop(L, 1); // Pop globals_backup } void ScriptApiSecurity::initializeSecurityClient() { static const char *whitelist[] = { "assert", "core", "collectgarbage", "DIR_DELIM", "error", "getfenv", "ipairs", "next", "pairs", "pcall", "print", "rawequal", "rawget", "rawset", "select", "setfenv", "setmetatable", "tonumber", "tostring", "type", "unpack", "_VERSION", "xpcall", // Completely safe libraries "coroutine", "string", "table", "math", }; static const char *os_whitelist[] = { "clock", "date", "difftime", "time" }; static const char *debug_whitelist[] = { "getinfo", }; #if USE_LUAJIT static const char *jit_whitelist[] = { "arch", "flush", "off", "on", "opt", "os", "status", "version", "version_num", }; #endif m_secure = true; lua_State *L = getStack(); int thread = getThread(L); // create an empty environment createEmptyEnv(L); // Copy safe base functions lua_getglobal(L, "_G"); lua_getfield(L, -2, "_G"); copy_safe(L, whitelist, sizeof(whitelist)); // And replace unsafe ones SECURE_API(g, dofile); SECURE_API(g, load); SECURE_API(g, loadfile); SECURE_API(g, loadstring); SECURE_API(g, require); lua_pop(L, 2); // Copy safe OS functions lua_getglobal(L, "os"); lua_newtable(L); copy_safe(L, os_whitelist, sizeof(os_whitelist)); lua_setfield(L, -3, "os"); lua_pop(L, 1); // Pop old OS // Copy safe debug functions lua_getglobal(L, "debug"); lua_newtable(L); copy_safe(L, debug_whitelist, sizeof(debug_whitelist)); lua_setfield(L, -3, "debug"); lua_pop(L, 1); // Pop old debug #if USE_LUAJIT // Copy safe jit functions, if they exist lua_getglobal(L, "jit"); lua_newtable(L); copy_safe(L, jit_whitelist, sizeof(jit_whitelist)); lua_setfield(L, -3, "jit"); lua_pop(L, 1); // Pop old jit #endif // Set the environment to the one we created earlier setLuaEnv(L, thread); } int ScriptApiSecurity::getThread(lua_State *L) { #if LUA_VERSION_NUM <= 501 int is_main = lua_pushthread(L); // Push the main thread FATAL_ERROR_IF(!is_main, "Security: ScriptApi's Lua state " "isn't the main Lua thread!"); return lua_gettop(L); #endif return 0; } void ScriptApiSecurity::createEmptyEnv(lua_State *L) { lua_newtable(L); // Create new environment lua_pushvalue(L, -1); lua_setfield(L, -2, "_G"); // Create the _G loop } void ScriptApiSecurity::setLuaEnv(lua_State *L, int thread) { #if LUA_VERSION_NUM >= 502 // Lua >= 5.2 // Set the global environment lua_rawseti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS); #else // Lua <= 5.1 // Set the environment of the main thread FATAL_ERROR_IF(!lua_setfenv(L, thread), "Security: Unable to set " "environment of the main Lua thread!"); lua_pop(L, 1); // Pop thread #endif } bool ScriptApiSecurity::isSecure(lua_State *L) { lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_GLOBALS_BACKUP); bool secure = !lua_isnil(L, -1); lua_pop(L, 1); return secure; } #define CHECK_FILE_ERR(ret, fp) \ if (ret) { \ lua_pushfstring(L, "%s: %s", path, strerror(errno)); \ if (fp) std::fclose(fp); \ return false; \ } bool ScriptApiSecurity::safeLoadFile(lua_State *L, const char *path, const char *display_name) { FILE *fp; char *chunk_name; if (!display_name) display_name = path; if (!path) { fp = stdin; chunk_name = const_cast<char *>("=stdin"); } else { fp = fopen(path, "rb"); if (!fp) { lua_pushfstring(L, "%s: %s", path, strerror(errno)); return false; } chunk_name = new char[strlen(display_name) + 2]; chunk_name[0] = '@'; chunk_name[1] = '\0'; strcat(chunk_name, display_name); } size_t start = 0; int c = std::getc(fp); if (c == '#') { // Skip the first line while ((c = std::getc(fp)) != EOF && c != '\n'); if (c == '\n') c = std::getc(fp); start = std::ftell(fp); } if (c == LUA_SIGNATURE[0]) { lua_pushliteral(L, "Bytecode prohibited when mod security is enabled."); std::fclose(fp); if (path) { delete [] chunk_name; } return false; } // Read the file int ret = std::fseek(fp, 0, SEEK_END); if (ret) { lua_pushfstring(L, "%s: %s", path, strerror(errno)); std::fclose(fp); if (path) { delete [] chunk_name; } return false; } size_t size = std::ftell(fp) - start; char *code = new char[size]; ret = std::fseek(fp, start, SEEK_SET); if (ret) { lua_pushfstring(L, "%s: %s", path, strerror(errno)); std::fclose(fp); delete [] code; if (path) { delete [] chunk_name; } return false; } size_t num_read = std::fread(code, 1, size, fp); if (path) { std::fclose(fp); } if (num_read != size) { lua_pushliteral(L, "Error reading file to load."); delete [] code; if (path) { delete [] chunk_name; } return false; } if (luaL_loadbuffer(L, code, size, chunk_name)) { delete [] code; return false; } delete [] code; if (path) { delete [] chunk_name; } return true; } bool ScriptApiSecurity::checkPath(lua_State *L, const char *path, bool write_required, bool *write_allowed) { if (write_allowed) *write_allowed = false; std::string str; // Transient std::string abs_path = fs::AbsolutePath(path); if (!abs_path.empty()) { // Don't allow accessing the settings file str = fs::AbsolutePath(g_settings_path); if (str == abs_path) return false; } // If we couldn't find the absolute path (path doesn't exist) then // try removing the last components until it works (to allow // non-existent files/folders for mkdir). std::string cur_path = path; std::string removed; while (abs_path.empty() && !cur_path.empty()) { std::string component; cur_path = fs::RemoveLastPathComponent(cur_path, &component); if (component == "..") { // Parent components can't be allowed or we could allow something like // /home/user/minetest/worlds/foo/noexist/../../../../../../etc/passwd. // If we have previous non-relative elements in the path we might be // able to remove them so that things like worlds/foo/noexist/../auth.txt // could be allowed, but those paths will be interpreted as nonexistent // by the operating system anyways. return false; } removed.append(component).append(removed.empty() ? "" : DIR_DELIM + removed); abs_path = fs::AbsolutePath(cur_path); } if (abs_path.empty()) return false; // Add the removed parts back so that you can't, eg, create a // directory in worldmods if worldmods doesn't exist. if (!removed.empty()) abs_path += DIR_DELIM + removed; // Get server from registry lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_SCRIPTAPI); ScriptApiBase *script = (ScriptApiBase *) lua_touserdata(L, -1); lua_pop(L, 1); const IGameDef *gamedef = script->getGameDef(); if (!gamedef) return false; // Get mod name lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_CURRENT_MOD_NAME); if (lua_isstring(L, -1)) { std::string mod_name = readParam<std::string>(L, -1); // Builtin can access anything if (mod_name == BUILTIN_MOD_NAME) { if (write_allowed) *write_allowed = true; return true; } // Allow paths in mod path // Don't bother if write access isn't important, since it will be handled later if (write_required || write_allowed != NULL) { const ModSpec *mod = gamedef->getModSpec(mod_name); if (mod) { str = fs::AbsolutePath(mod->path); if (!str.empty() && fs::PathStartsWith(abs_path, str)) { if (write_allowed) *write_allowed = true; return true; } } } } lua_pop(L, 1); // Pop mod name // Allow read-only access to all mod directories if (!write_required) { const std::vector<ModSpec> &mods = gamedef->getMods(); for (const ModSpec &mod : mods) { str = fs::AbsolutePath(mod.path); if (!str.empty() && fs::PathStartsWith(abs_path, str)) { return true; } } } str = fs::AbsolutePath(gamedef->getWorldPath()); if (!str.empty()) { // Don't allow access to other paths in the world mod/game path. // These have to be blocked so you can't override a trusted mod // by creating a mod with the same name in a world mod directory. // We add to the absolute path of the world instead of getting // the absolute paths directly because that won't work if they // don't exist. if (fs::PathStartsWith(abs_path, str + DIR_DELIM + "worldmods") || fs::PathStartsWith(abs_path, str + DIR_DELIM + "game")) { return false; } // Allow all other paths in world path if (fs::PathStartsWith(abs_path, str)) { if (write_allowed) *write_allowed = true; return true; } } // Default to disallowing return false; } int ScriptApiSecurity::sl_g_dofile(lua_State *L) { int nret = sl_g_loadfile(L); if (nret != 1) { lua_error(L); // code after this function isn't executed } int top_precall = lua_gettop(L); lua_call(L, 0, LUA_MULTRET); // Return number of arguments returned by the function, // adjusting for the function being poped. return lua_gettop(L) - (top_precall - 1); } int ScriptApiSecurity::sl_g_load(lua_State *L) { size_t len; const char *buf; std::string code; const char *chunk_name = "=(load)"; luaL_checktype(L, 1, LUA_TFUNCTION); if (!lua_isnone(L, 2)) { luaL_checktype(L, 2, LUA_TSTRING); chunk_name = lua_tostring(L, 2); } while (true) { lua_pushvalue(L, 1); lua_call(L, 0, 1); int t = lua_type(L, -1); if (t == LUA_TNIL) { break; } if (t != LUA_TSTRING) { lua_pushnil(L); lua_pushliteral(L, "Loader didn't return a string"); return 2; } buf = lua_tolstring(L, -1, &len); code += std::string(buf, len); lua_pop(L, 1); // Pop return value } if (code[0] == LUA_SIGNATURE[0]) { lua_pushnil(L); lua_pushliteral(L, "Bytecode prohibited when mod security is enabled."); return 2; } if (luaL_loadbuffer(L, code.data(), code.size(), chunk_name)) { lua_pushnil(L); lua_insert(L, lua_gettop(L) - 1); return 2; } return 1; } int ScriptApiSecurity::sl_g_loadfile(lua_State *L) { #ifndef SERVER lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_SCRIPTAPI); ScriptApiBase *script = (ScriptApiBase *) lua_touserdata(L, -1); lua_pop(L, 1); if (script->getType() == ScriptingType::Client) { std::string display_path = readParam<std::string>(L, 1); const std::string *path = script->getClient()->getModFile(display_path); if (!path) { std::string error_msg = "Coudln't find script called:" + display_path; lua_pushnil(L); lua_pushstring(L, error_msg.c_str()); return 2; } if (!safeLoadFile(L, path->c_str(), display_path.c_str())) { lua_pushnil(L); lua_insert(L, -2); return 2; } return 1; } #endif const char *path = NULL; if (lua_isstring(L, 1)) { path = lua_tostring(L, 1); CHECK_SECURE_PATH_INTERNAL(L, path, false, NULL); } if (!safeLoadFile(L, path)) { lua_pushnil(L); lua_insert(L, -2); return 2; } return 1; } int ScriptApiSecurity::sl_g_loadstring(lua_State *L) { const char *chunk_name = "=(load)"; luaL_checktype(L, 1, LUA_TSTRING); if (!lua_isnone(L, 2)) { luaL_checktype(L, 2, LUA_TSTRING); chunk_name = lua_tostring(L, 2); } size_t size; const char *code = lua_tolstring(L, 1, &size); if (size > 0 && code[0] == LUA_SIGNATURE[0]) { lua_pushnil(L); lua_pushliteral(L, "Bytecode prohibited when mod security is enabled."); return 2; } if (luaL_loadbuffer(L, code, size, chunk_name)) { lua_pushnil(L); lua_insert(L, lua_gettop(L) - 1); return 2; } return 1; } int ScriptApiSecurity::sl_g_require(lua_State *L) { lua_pushliteral(L, "require() is disabled when mod security is on."); return lua_error(L); } int ScriptApiSecurity::sl_io_open(lua_State *L) { bool with_mode = lua_gettop(L) > 1; luaL_checktype(L, 1, LUA_TSTRING); const char *path = lua_tostring(L, 1); bool write_requested = false; if (with_mode) { luaL_checktype(L, 2, LUA_TSTRING); const char *mode = lua_tostring(L, 2); write_requested = strchr(mode, 'w') != NULL || strchr(mode, '+') != NULL || strchr(mode, 'a') != NULL; } CHECK_SECURE_PATH_INTERNAL(L, path, write_requested, NULL); push_original(L, "io", "open"); lua_pushvalue(L, 1); if (with_mode) { lua_pushvalue(L, 2); } lua_call(L, with_mode ? 2 : 1, 2); return 2; } int ScriptApiSecurity::sl_io_input(lua_State *L) { if (lua_isstring(L, 1)) { const char *path = lua_tostring(L, 1); CHECK_SECURE_PATH_INTERNAL(L, path, false, NULL); } push_original(L, "io", "input"); lua_pushvalue(L, 1); lua_call(L, 1, 1); return 1; } int ScriptApiSecurity::sl_io_output(lua_State *L) { if (lua_isstring(L, 1)) { const char *path = lua_tostring(L, 1); CHECK_SECURE_PATH_INTERNAL(L, path, true, NULL); } push_original(L, "io", "output"); lua_pushvalue(L, 1); lua_call(L, 1, 1); return 1; } int ScriptApiSecurity::sl_io_lines(lua_State *L) { if (lua_isstring(L, 1)) { const char *path = lua_tostring(L, 1); CHECK_SECURE_PATH_INTERNAL(L, path, false, NULL); } int top_precall = lua_gettop(L); push_original(L, "io", "lines"); lua_pushvalue(L, 1); lua_call(L, 1, LUA_MULTRET); // Return number of arguments returned by the function, // adjusting for the function being poped. return lua_gettop(L) - top_precall; } int ScriptApiSecurity::sl_os_rename(lua_State *L) { luaL_checktype(L, 1, LUA_TSTRING); const char *path1 = lua_tostring(L, 1); CHECK_SECURE_PATH_INTERNAL(L, path1, true, NULL); luaL_checktype(L, 2, LUA_TSTRING); const char *path2 = lua_tostring(L, 2); CHECK_SECURE_PATH_INTERNAL(L, path2, true, NULL); push_original(L, "os", "rename"); lua_pushvalue(L, 1); lua_pushvalue(L, 2); lua_call(L, 2, 2); return 2; } int ScriptApiSecurity::sl_os_remove(lua_State *L) { luaL_checktype(L, 1, LUA_TSTRING); const char *path = lua_tostring(L, 1); CHECK_SECURE_PATH_INTERNAL(L, path, true, NULL); push_original(L, "os", "remove"); lua_pushvalue(L, 1); lua_call(L, 1, 2); return 2; }