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/*
* Copyright (C) 2015 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* 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 General Public License for more details.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <dlfcn.h>
#include <syslog.h>
#include "seccomp.h"
#include "../preload.h"
static main_t __main__;
static int __preload_main__(int argc, char **argv, char **envp)
{
uid_t uid = getuid();
char *env_file = getenv("SECCOMP_FILE");
if (uid) {
INFO("preload-seccomp: %s: not root, cannot install seccomp filter\n", *argv);
return -1;
}
if (install_syscall_filter(*argv, env_file))
return -1;
unsetenv("LD_PRELOAD");
unsetenv("SECCOMP_FILE");
return (*__main__)(argc, argv, envp);
}
int __libc_start_main(main_t main,
int argc,
char **argv,
ElfW(auxv_t) *auxvec,
__typeof (main) init,
void (*fini) (void),
void (*rtld_fini) (void),
void *stack_end)
{
start_main_t __start_main__;
__start_main__ = dlsym(RTLD_NEXT, "__libc_start_main");
if (!__start_main__)
INFO("failed to find __libc_start_main %s\n", dlerror());
__main__ = main;
return (*__start_main__)(__preload_main__, argc, argv, auxvec,
init, fini, rtld_fini, stack_end);
}
void __uClibc_main(main_t main,
int argc,
char **argv,
void (*app_init)(void),
void (*app_fini)(void),
void (*rtld_fini)(void),
void *stack_end attribute_unused)
{
uClibc_main __start_main__;
__start_main__ = dlsym(RTLD_NEXT, "__uClibc_main");
if (!__start_main__)
INFO("failed to find __uClibc_main %s\n", dlerror());
__main__ = main;
return (*__start_main__)(__preload_main__, argc, argv,
app_init, app_fini, rtld_fini, stack_end);
}
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