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/***************************************************************************
* ncat_lua.c -- ncat lua facilities *
***********************IMPORTANT NMAP LICENSE TERMS************************
*
* The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
* Project"). Nmap is also a registered trademark of the Nmap Project.
*
* This program is distributed under the terms of the Nmap Public Source
* License (NPSL). The exact license text applying to a particular Nmap
* release or source code control revision is contained in the LICENSE
* file distributed with that version of Nmap or source code control
* revision. More Nmap copyright/legal information is available from
* https://nmap.org/book/man-legal.html, and further information on the
* NPSL license itself can be found at https://nmap.org/npsl/ . This
* header summarizes some key points from the Nmap license, but is no
* substitute for the actual license text.
*
* Nmap is generally free for end users to download and use themselves,
* including commercial use. It is available from https://nmap.org.
*
* The Nmap license generally prohibits companies from using and
* redistributing Nmap in commercial products, but we sell a special Nmap
* OEM Edition with a more permissive license and special features for
* this purpose. See https://nmap.org/oem/
*
* If you have received a written Nmap license agreement or contract
* stating terms other than these (such as an Nmap OEM license), you may
* choose to use and redistribute Nmap under those terms instead.
*
* The official Nmap Windows builds include the Npcap software
* (https://npcap.com) for packet capture and transmission. It is under
* separate license terms which forbid redistribution without special
* permission. So the official Nmap Windows builds may not be redistributed
* without special permission (such as an Nmap OEM license).
*
* Source is provided to this software because we believe users have a
* right to know exactly what a program is going to do before they run it.
* This also allows you to audit the software for security holes.
*
* Source code also allows you to port Nmap to new platforms, fix bugs, and add
* new features. You are highly encouraged to submit your changes as a Github PR
* or by email to the dev@nmap.org mailing list for possible incorporation into
* the main distribution. Unless you specify otherwise, it is understood that
* you are offering us very broad rights to use your submissions as described in
* the Nmap Public Source License Contributor Agreement. This is important
* because we fund the project by selling licenses with various terms, and also
* because the inability to relicense code has caused devastating problems for
* other Free Software projects (such as KDE and NASM).
*
* The free version of Nmap 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. Warranties,
* indemnification and commercial support are all available through the
* Npcap OEM program--see https://nmap.org/oem/
*
***************************************************************************/
/* $Id$ */
#include "ncat.h"
#include "ncat_lua.h"
static lua_State *L;
static int last_function_number;
static void report(char *prefix)
{
const char *errormsg;
errormsg = lua_tostring(L, -1);
if (errormsg == NULL)
errormsg = "(error object is not a string)";
bye("%s: %s.", prefix, errormsg);
}
static int traceback (lua_State *LL)
{
const char *msg;
msg = lua_tostring(LL, 1);
if (msg) {
luaL_traceback(LL, LL, msg, 1);
} else {
if (!lua_isnoneornil(LL, 1)) { /* is there an error object? */
if (!luaL_callmeta(LL, 1, "__tostring")) /* try its 'tostring' metamethod */
lua_pushliteral(LL, "(no error message)");
}
}
return 1;
}
void lua_setup(void)
{
ncat_assert(o.cmdexec != NULL);
L = luaL_newstate();
luaL_openlibs(L);
if (luaL_loadfile(L, o.cmdexec) != 0)
report("Error loading the Lua script");
/* install the traceback function */
last_function_number = lua_gettop(L);
lua_pushcfunction(L, traceback);
lua_insert(L, last_function_number);
}
void lua_run(void)
{
if (lua_pcall(L, 0, 0, last_function_number) != LUA_OK && !lua_isnil(L, -1)) {
/* handle the error; the code below is taken from lua.c, Lua source code */
lua_remove(L, last_function_number);
report("Error running the Lua script");
} else {
if (o.debug)
logdebug("%s returned successfully.\n", o.cmdexec);
lua_close(L);
exit(EXIT_SUCCESS);
}
}
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