mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-23 03:06:48 +00:00
1f31e00e19
This module is bundled into flua, it only provides for now the exec
function. The point of the function is to be able to execute a program
without actually executing a shell.
to use it:
fbsd.exec({"id", "bapt"})
Reviewed by: manu
Differential Revision: https://reviews.freebsd.org/D41840
135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright 2023 Baptiste Daroussin <bapt@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted providing that the following conditions~
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/wait.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <spawn.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <lua.h>
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#include "lauxlib.h"
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#include "lfbsd.h"
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extern char **environ;
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static const char**
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luaL_checkarraystrings(lua_State *L, int arg)
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{
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const char **ret;
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lua_Integer n, i;
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int t;
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int abs_arg = lua_absindex(L, arg);
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luaL_checktype(L, abs_arg, LUA_TTABLE);
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n = lua_rawlen(L, abs_arg);
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ret = lua_newuserdata(L, (n+1)*sizeof(char*));
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for (i=0; i<n; i++) {
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t = lua_rawgeti(L, abs_arg, i+1);
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if (t == LUA_TNIL)
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break;
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luaL_argcheck(L, t == LUA_TSTRING, arg, "expected array of strings");
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ret[i] = lua_tostring(L, -1);
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lua_pop(L, 1);
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}
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ret[i] = NULL;
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return ret;
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}
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static int
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lua_exec(lua_State *L)
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{
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int r, pstat;
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posix_spawn_file_actions_t action;
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int stdin_pipe[2] = {-1, -1};
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pid_t pid;
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const char **argv;
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int n = lua_gettop(L);
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luaL_argcheck(L, n == 1, n > 1 ? 2 : n,
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"fbsd.exec takes exactly one argument");
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if (pipe(stdin_pipe) < 0) {
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lua_pushnil(L);
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lua_pushstring(L, strerror(errno));
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lua_pushinteger(L, errno);
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return (3);
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}
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posix_spawn_file_actions_init(&action);
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posix_spawn_file_actions_adddup2(&action, stdin_pipe[0], STDIN_FILENO);
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posix_spawn_file_actions_addclose(&action, stdin_pipe[1]);
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argv = luaL_checkarraystrings(L, 1);
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if (0 != (r = posix_spawnp(&pid, argv[0], &action, NULL,
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(char*const*)argv, environ))) {
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lua_pushnil(L);
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lua_pushstring(L, strerror(r));
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lua_pushinteger(L, r);
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return (3);
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}
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while (waitpid(pid, &pstat, 0) == -1) {
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if (errno != EINTR) {
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lua_pushnil(L);
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lua_pushstring(L, strerror(r));
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lua_pushinteger(L, r);
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return (3);
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}
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}
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if (WEXITSTATUS(pstat) != 0) {
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lua_pushnil(L);
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lua_pushstring(L, "Abnormal termination");
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lua_pushinteger(L, r);
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return (3);
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}
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posix_spawn_file_actions_destroy(&action);
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if (stdin_pipe[0] != -1)
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close(stdin_pipe[0]);
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if (stdin_pipe[1] != -1)
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close(stdin_pipe[1]);
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lua_pushinteger(L, pid);
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return 1;
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}
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#define REG_SIMPLE(n) { #n, lua_ ## n }
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static const struct luaL_Reg fbsd_lib[] = {
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REG_SIMPLE(exec),
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{ NULL, NULL },
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};
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#undef REG_SIMPLE
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int
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luaopen_fbsd(lua_State *L)
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{
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luaL_newlib(L, fbsd_lib);
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return (1);
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}
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