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170 lines (147 loc) · 4.6 KB
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/*
* Copyright 2016 GitHub, Inc
*
* Based on lua.c, the Lua C Interpreter
* Copyright (C) 1994-2012 Lua.org, PUC-Rio. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "lauxlib.h"
#include "lua.h"
#include "lualib.h"
static lua_State *globalL = NULL;
static const char *progname = NULL;
static void lstop(lua_State *L, lua_Debug *ar) {
(void)ar; /* unused arg. */
lua_sethook(L, NULL, 0, 0);
luaL_error(L, "interrupted!");
}
static void laction(int i) {
signal(i, SIG_DFL);
lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
}
static void l_message(const char *pname, const char *msg) {
if (pname)
fprintf(stderr, "%s: ", pname);
fprintf(stderr, "%s\n", msg);
fflush(stderr);
}
static int report(lua_State *L, int status) {
if (status && !lua_isnil(L, -1)) {
const char *msg = lua_tostring(L, -1);
if (msg == NULL)
msg = "(error object is not a string)";
l_message(progname, msg);
lua_pop(L, 1);
}
return status;
}
static int traceback(lua_State *L) {
if (!lua_isstring(L, 1)) /* 'message' not a string? */
return 1; /* keep it intact */
lua_getglobal(L, "debug");
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return 1;
}
lua_getfield(L, -1, "traceback");
if (!lua_isfunction(L, -1)) {
lua_pop(L, 2);
return 1;
}
lua_pushvalue(L, 1); /* pass error message */
lua_pushinteger(L, 2); /* skip this function and traceback */
lua_call(L, 2, 1); /* call debug.traceback */
return 1;
}
static int docall(lua_State *L, int narg, int clear) {
int status;
int base = lua_gettop(L) - narg; /* function index */
lua_pushcfunction(L, traceback); /* push traceback function */
lua_insert(L, base); /* put it under chunk and args */
signal(SIGINT, laction);
status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
signal(SIGINT, SIG_DFL);
lua_remove(L, base); /* remove traceback function */
/* force a complete garbage collection in case of errors */
if (status != 0)
lua_gc(L, LUA_GCCOLLECT, 0);
return status;
}
static int dolibrary(lua_State *L, const char *name, int clear) {
lua_getglobal(L, "require");
lua_pushstring(L, name);
return report(L, docall(L, 1, clear));
}
struct Smain {
int argc;
char **argv;
int status;
};
static void pushargv(lua_State *L, char **argv, int argc, int offset) {
int i, j;
lua_createtable(L, argc, 0);
for (i = offset, j = 1; i < argc; i++, j++) {
lua_pushstring(L, argv[i]);
lua_rawseti(L, -2, j);
}
}
static int pmain(lua_State *L) {
struct Smain *s = (struct Smain *)lua_touserdata(L, 1);
globalL = L;
lua_gc(L, LUA_GCSTOP, 0);
luaL_openlibs(L);
lua_gc(L, LUA_GCRESTART, 0);
s->status = dolibrary(L, "bcc", 0);
if (s->status)
return 0;
lua_pushstring(L, progname);
lua_setglobal(L, "BCC_STANDALONE");
pushargv(L, s->argv, s->argc, 1);
lua_setglobal(L, "arg");
s->status = report(L, docall(L, 0, 1));
return 0;
}
int main(int argc, char **argv) {
int status;
struct Smain s;
lua_State *L = lua_open(); /* create state */
if (L == NULL) {
l_message(argv[0], "cannot create state: not enough memory");
return EXIT_FAILURE;
}
if (geteuid() != 0) {
l_message(argv[0], "bcc-lua must be ran as root");
return EXIT_FAILURE;
}
progname = argv[0];
s.argc = argc;
s.argv = argv;
s.status = 0;
status = lua_cpcall(L, &pmain, &s);
report(L, status);
lua_close(L);
return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
}