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/*
* anylike
*
* anylike is an IKEv2 Implementation written in Lua and C. It's main
* design goal is to provide anytun and uanytun or any other SATP
* implementation with a key exchange mechanism but it should also be
* possible to use anylike as key exchange daemon for IPSec security
* associations. The use of Lua guarantees that anylike is easily
* portable to many platforms including very small ones like wireless
* routers.
*
*
* Copyright (C) 2009-2010 Markus Grueneis <gimpf@anylike.org>
* Christian Pointner <equinox@anylike.org>
*
* This file is part of anylike.
*
* anylike is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* anylike 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.
*
* You should have received a copy of the GNU General Public License
* along with anylike. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include "datatypes.h"
#include "options.h"
#include "string_list.h"
#include "log.h"
#include "l_log.h"
#include "l_crypt.h"
#include "l_sig_handler.h"
#ifndef USE_OPENSSL
#include <gnutls/gnutls.h>
#endif
#include "daemon.h"
#ifndef USE_OPENSSL
#define MIN_GNUTLS_VERSION "2.8.3"
void anylike_gnutls_log_func(int level, const char* msg)
{
log_printf(DEBUG, msg); // TODO: convert level to proper log priority
}
int init_gnutls()
{
int ret = gnutls_global_init();
if(ret != GNUTLS_E_SUCCESS) {
log_printf(ERROR, "gnutls_global_init() returned with error 0x%04X", ret);
return -1;
}
if(!gnutls_check_version(MIN_GNUTLS_VERSION)) {
log_printf(NOTICE, "invalid Version of gnutls, should be >= %s but is %s", MIN_GNUTLS_VERSION, gnutls_check_version(NULL));
gnutls_global_deinit();
return -1;
}
gnutls_global_set_log_function(anylike_gnutls_log_func);
gnutls_global_set_log_level(11); // TODO: find a better level (this is very talky)
log_printf(NOTICE, "gnutls init finished");
return 0;
}
#endif
void cleanup_crypt()
{
#ifndef USE_OPENSSL
gnutls_global_deinit();
#endif
}
#include "anylike_lua_bytecode.h"
#define LUA_MAIN_LOOP_FUNC "main_loop"
static const luaL_Reg anylike_lualibs[] = {
{"", luaopen_base},
{LUA_LOADLIBNAME, luaopen_package},
{LUA_TABLIBNAME, luaopen_table},
{LUA_STRLIBNAME, luaopen_string},
{LUA_MATHLIBNAME, luaopen_math},
{LUA_LOGLIBNAME, luaopen_log},
{LUA_SIGNALLIBNAME, luaopen_signal},
{LUA_CRYPTLIBNAME, luaopen_crypt},
{NULL, NULL}
};
int init_main_loop(lua_State *L)
{
const luaL_Reg *lib = anylike_lualibs;
for (; lib->func; lib++) {
lua_pushcfunction(L, lib->func);
lua_pushstring(L, lib->name);
lua_call(L, 1, 0);
}
int ret = luaL_loadbuffer(L, anylike_lua_bytecode, sizeof(anylike_lua_bytecode), "anylike");
if(ret) {
const char* err_str = luaL_checkstring(L, -1);
switch(ret) {
case LUA_ERRSYNTAX: log_printf(ERROR, "luaL_loadbuffer() syntax error: %s", err_str); break;
case LUA_ERRMEM: log_printf(ERROR, "luaL_loadbuffer() malloc error: %s", err_str); break;
default: log_printf(ERROR, "luaL_loadbuffer() unknown error: %s", err_str); break;
}
return -1;
}
ret = lua_pcall(L, 0, 0, 0);
if(ret) {
const char* err_str = luaL_checkstring(L, -1);
switch(ret) {
case LUA_ERRRUN: log_printf(ERROR, "lua_pcall() runtime error: %s", err_str); break;
case LUA_ERRMEM: log_printf(ERROR, "lua_pcall() malloc error: %s", err_str); break;
case LUA_ERRERR: log_printf(ERROR, "lua_pcall() error at error handler function: %s", err_str); break;
}
return -1;
}
return 0;
}
int call_main_loop(lua_State* L, options_t* opt)
{
lua_getglobal(L, LUA_MAIN_LOOP_FUNC);
if(!lua_isfunction(L, -1)) {
log_printf(ERROR, "there is no function '%s' inside anylike bytecode", LUA_MAIN_LOOP_FUNC);
return -1;
};
options_lua_push(opt, L);
int ret = lua_pcall(L, 1, LUA_MULTRET, 0);
if(ret) {
const char* err_str = luaL_checkstring(L, -1);
switch(ret) {
case LUA_ERRRUN: log_printf(ERROR, "lua_pcall(%s) runtime error: %s", LUA_MAIN_LOOP_FUNC, err_str); break;
case LUA_ERRMEM: log_printf(ERROR, "lua_pcall(%s) malloc error: %s", LUA_MAIN_LOOP_FUNC, err_str); break;
case LUA_ERRERR: log_printf(ERROR, "lua_pcall(%s) error at error handler function: %s", LUA_MAIN_LOOP_FUNC, err_str); break;
}
return -1;
}
int n = lua_gettop(L);
log_printf(DEBUG, "%s returned %d values", LUA_MAIN_LOOP_FUNC, n);
int i;
for (i = 1; i <= n; i++)
log_printf(DEBUG, "return value [%d] = '%s'", i, luaL_checkstring(L, i));
ret = lua_tointeger(L, 1);
return ret;
}
int main_loop(options_t* opt)
{
lua_State *L;
L = luaL_newstate();
if(!L) {
log_printf(ERROR, "error creating lua state");
return -1;
}
int ret = init_main_loop(L);
if(!ret)
ret = call_main_loop(L, opt);
lua_close(L);
return ret;
}
int main(int argc, char* argv[])
{
log_init();
options_t opt;
int ret = options_parse(&opt, argc, argv);
if(ret) {
if(ret > 0) {
fprintf(stderr, "syntax error near: %s\n\n", argv[ret]);
}
if(ret == -2) {
fprintf(stderr, "memory error on options_parse, exitting\n");
}
if(ret == -3) {
options_print_version();
}
if(ret != -2 && ret != -3)
options_print_usage();
if(ret == -1 || ret == -3)
ret = 0;
options_clear(&opt);
log_close();
exit(ret);
}
string_list_element_t* tmp = opt.log_targets_.first_;
if(!tmp) {
log_add_target("syslog:3,anylike,daemon");
}
else {
while(tmp) {
ret = log_add_target(tmp->string_);
if(ret) {
switch(ret) {
case -2: fprintf(stderr, "memory error on log_add_target, exitting\n"); break;
case -3: fprintf(stderr, "unknown log target: '%s', exitting\n", tmp->string_); break;
case -4: fprintf(stderr, "this log target is only allowed once: '%s', exitting\n", tmp->string_); break;
default: fprintf(stderr, "syntax error near: '%s', exitting\n", tmp->string_); break;
}
options_clear(&opt);
log_close();
exit(ret);
}
tmp = tmp->next_;
}
}
log_printf(NOTICE, "just started...");
options_parse_post(&opt);
priv_info_t priv;
if(opt.username_)
if(priv_init(&priv, opt.username_, opt.groupname_)) {
options_clear(&opt);
log_close();
exit(-1);
}
#ifndef USE_OPENSSL
ret = init_gnutls();
if(ret) {
log_printf(ERROR, "error on gnutls initialization, exitting");
options_clear(&opt);
log_close();
exit(ret);
}
#endif
FILE* pid_file = NULL;
if(opt.pid_file_) {
pid_file = fopen(opt.pid_file_, "w");
if(!pid_file) {
log_printf(WARNING, "unable to open pid file: %s", strerror(errno));
}
}
if(opt.chroot_dir_)
if(do_chroot(opt.chroot_dir_)) {
cleanup_crypt();
options_clear(&opt);
log_close();
exit(-1);
}
if(opt.username_)
if(priv_drop(&priv)) {
cleanup_crypt();
options_clear(&opt);
log_close();
exit(-1);
}
if(opt.daemonize_) {
pid_t oldpid = getpid();
daemonize();
log_printf(INFO, "running in background now (old pid: %d)", oldpid);
}
if(pid_file) {
pid_t pid = getpid();
fprintf(pid_file, "%d", pid);
fclose(pid_file);
}
ret = main_loop(&opt);
cleanup_crypt();
options_clear(&opt);
if(!ret)
log_printf(NOTICE, "normal shutdown");
else if(ret < 0)
log_printf(NOTICE, "shutdown after error");
else
log_printf(NOTICE, "shutdown after signal");
log_close();
return ret;
}
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