324 lines
8.5 KiB
C
324 lines
8.5 KiB
C
/*
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* packet-lua.c
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*
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* Wireshark's interface to the Lua Programming Language
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*
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* (c) 2006, Luis E. Garcia Ontanon <luis.ontanon@gmail.com>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "wslua.h"
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#include <epan/nstime.h>
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#include <math.h>
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#include <epan/expert.h>
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#include <epan/ex-opt.h>
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#include <epan/privileges.h>
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static lua_State* L = NULL;
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packet_info* lua_pinfo;
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struct _wslua_treeitem* lua_tree;
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tvbuff_t* lua_tvb;
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int lua_malformed;
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int lua_dissectors_table_ref;
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dissector_handle_t lua_data_handle;
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static int wslua_not_register_menu(lua_State* LS) {
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luaL_error(LS,"too late to register a menu");
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return 0;
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}
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void dissect_lua(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree) {
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lua_pinfo = pinfo;
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lua_tvb = tvb;
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lua_tree = ep_alloc(sizeof(struct _wslua_treeitem));
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lua_tree->tree = tree;
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lua_tree->item = proto_tree_add_text(tree,tvb,0,0,"lua fake item");
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PROTO_ITEM_SET_HIDDEN(lua_tree->item);
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/*
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* almost equivalent to Lua:
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* dissectors[current_proto](tvb,pinfo,tree)
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*/
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lua_settop(L,0);
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lua_rawgeti(L, LUA_REGISTRYINDEX, lua_dissectors_table_ref);
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lua_pushstring(L, pinfo->current_proto);
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lua_gettable(L, -2);
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lua_remove(L,1);
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if (lua_isfunction(L,1)) {
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push_Tvb(L,tvb);
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push_Pinfo(L,pinfo);
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push_TreeItem(L,lua_tree);
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if ( lua_pcall(L,3,0,0) ) {
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const gchar* error = lua_tostring(L,-1);
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proto_item* pi = proto_tree_add_text(tree,tvb,0,0,"Lua Error: %s",error);
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expert_add_info_format(pinfo, pi, PI_DEBUG, PI_ERROR ,"Lua Error");
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}
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} else {
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proto_item* pi = proto_tree_add_text(tree,tvb,0,0,"Lua Error: did not find the %s dissector"
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" in the dissectors table",pinfo->current_proto);
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expert_add_info_format(pinfo, pi, PI_DEBUG, PI_ERROR ,"Lua Error");
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}
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clear_outstanding_tvbs();
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clear_outstanding_pinfos();
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clear_outstanding_trees();
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lua_pinfo = NULL;
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lua_tree = NULL;
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lua_tvb = NULL;
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}
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static void iter_table_and_call(lua_State* LS, int env, const gchar* table_name, lua_CFunction error_handler) {
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lua_settop(LS,0);
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lua_pushcfunction(LS,error_handler);
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lua_pushstring(LS, table_name);
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lua_gettable(LS, env);
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if (!lua_istable(LS, 2)) {
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report_failure("Lua: either `%s' does not exist or it is not a table!\n",table_name);
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lua_close(LS);
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L = NULL;
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return;
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}
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lua_pushnil(LS);
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while (lua_next(LS, 2)) {
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const gchar* name = lua_tostring(L,-2);
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if (lua_isfunction(LS,-1)) {
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if ( lua_pcall(LS,0,0,1) ) {
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lua_pop(LS,1);
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}
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} else {
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report_failure("Lua: Something not a function got its way into the %s.%s",table_name,name);
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lua_close(LS);
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L = NULL;
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return;
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}
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}
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lua_settop(LS,0);
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}
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static int init_error_handler(lua_State* LS) {
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const gchar* error = lua_tostring(LS,1);
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report_failure("Lua: Error During execution of Initialization:\n %s",error);
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return 0;
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}
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static void wslua_init_routine(void) {
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static gboolean initialized = FALSE;
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if ( ! initialized ) {
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lua_prime_all_fields(NULL);
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initialized = TRUE;
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}
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if (L) {
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iter_table_and_call(L, LUA_GLOBALSINDEX, WSLUA_INIT_ROUTINES,init_error_handler);
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}
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}
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static const char *getF(lua_State *L _U_, void *ud, size_t *size)
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{
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FILE *f=(FILE *)ud;
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static char buff[512];
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if (feof(f)) return NULL;
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*size=fread(buff,1,sizeof(buff),f);
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return (*size>0) ? buff : NULL;
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}
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static int lua_main_error_handler(lua_State* LS) {
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const gchar* error = lua_tostring(LS,1);
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report_failure("Lua: Error during loading:\n %s",error);
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return 0;
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}
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void lua_load_script(const gchar* filename) {
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FILE* file;
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if (! ( file = fopen(filename,"r")) ) {
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report_open_failure(filename,errno,FALSE);
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return;
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}
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lua_settop(L,0);
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lua_pushcfunction(L,lua_main_error_handler);
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switch (lua_load(L,getF,file,filename)) {
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case 0:
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lua_pcall(L,0,0,1);
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fclose(file);
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return;
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case LUA_ERRSYNTAX: {
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report_failure("Lua: syntax error during precompilation of `%s':\n%s",filename,lua_tostring(L,-1));
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fclose(file);
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return;
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}
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case LUA_ERRMEM:
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report_failure("Lua: memory allocation error during execution of %s",filename);
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fclose(file);
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return;
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}
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}
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static void basic_logger(const gchar *log_domain _U_,
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GLogLevelFlags log_level _U_,
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const gchar *message,
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gpointer user_data _U_) {
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fputs(message,stderr);
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}
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static int wslua_panic(lua_State* LS) {
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g_error("LUA PANIC: %s",lua_tostring(LS,-1));
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return 0;
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}
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int wslua_init(lua_State* LS) {
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const gchar* filename;
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const funnel_ops_t* ops = funnel_get_funnel_ops();
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gboolean run_anyway = FALSE;
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/* set up the logger */
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g_log_set_handler(LOG_DOMAIN_LUA, G_LOG_LEVEL_CRITICAL|
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G_LOG_LEVEL_WARNING|
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G_LOG_LEVEL_MESSAGE|
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G_LOG_LEVEL_INFO|
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G_LOG_LEVEL_DEBUG,
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ops ? ops->logger : basic_logger, NULL);
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if (!L) {
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if (LS)
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L = LS;
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else
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L = luaL_newstate();
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}
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WSLUA_INIT(L);
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lua_atpanic(L,wslua_panic);
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/* the init_routines table (accessible by the user) */
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lua_pushstring(L, WSLUA_INIT_ROUTINES);
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lua_newtable (L);
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lua_settable(L, LUA_GLOBALSINDEX);
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/* the dissectors table goes in the registry (not accessible) */
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lua_newtable (L);
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lua_dissectors_table_ref = luaL_ref(L, LUA_REGISTRYINDEX);
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/* set running_superuser variable to it's propper value */
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WSLUA_REG_GLOBAL_BOOL(L,"running_superuser",started_with_special_privs());
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/* load system's init.lua */
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filename = get_datafile_path("init.lua");
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if (( file_exists(filename))) {
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lua_load_script(filename);
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}
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/* check if lua is to be disabled */
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lua_pushstring(L,"lua_disabled");
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lua_gettable(L, LUA_GLOBALSINDEX);
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if (lua_isboolean(L,-1) && lua_toboolean(L,-1)) {
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/* disable lua */
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lua_close(L);
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L = NULL;
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return 0;
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}
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/* check whether we should run other scripts even if running superuser */
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lua_pushstring(L,"run_user_scripts_when_superuser");
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lua_gettable(L, LUA_GLOBALSINDEX);
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if (lua_isboolean(L,-1) && lua_toboolean(L,-1)) {
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run_anyway = TRUE;
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}
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/* if we are indeed superuser run user scripts only if told to do so */
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if ( (!started_with_special_privs()) || run_anyway ) {
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filename = get_persconffile_path("init.lua", FALSE);
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if (( file_exists(filename))) {
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lua_load_script(filename);
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}
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while((filename = ex_opt_get_next("lua_script"))) {
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lua_load_script(filename);
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}
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}
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/* at this point we're set up so register the init routine */
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register_init_routine(wslua_init_routine);
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/*
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* after this point it is too late to register a menu
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* disable the function to avoid weirdness
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*/
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lua_pushstring(L, "register_menu");
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lua_pushcfunction(L, wslua_not_register_menu);
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lua_settable(L, LUA_GLOBALSINDEX);
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/* set up some essential globals */
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lua_pinfo = NULL;
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lua_tree = NULL;
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lua_tvb = NULL;
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lua_data_handle = find_dissector("data");
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lua_malformed = proto_get_id_by_filter_name("malformed");
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Proto_commit(L);
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return 0;
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}
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lua_State* wslua_state() { return L; }
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