forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
From Robert G. Jakabosky From me: cleanup so that it applies to trunk. svn path=/trunk/; revision=52798
511 lines
14 KiB
C
511 lines
14 KiB
C
/*
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* init_wslua.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.org>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "wslua.h"
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#include "init_wslua.h"
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#include <epan/dissectors/packet-frame.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/plugins.h>
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#include <wsutil/privileges.h>
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#include <wsutil/file_util.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_dissectors_table_ref;
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static int proto_lua = -1;
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static expert_field ei_lua_error = EI_INIT;
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dissector_handle_t lua_data_handle;
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static void lua_frame_end(void)
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{
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clear_outstanding_Tvb();
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clear_outstanding_TvbRange();
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clear_outstanding_Pinfo();
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clear_outstanding_Column();
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clear_outstanding_Columns();
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clear_outstanding_PrivateTable();
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clear_outstanding_TreeItem();
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}
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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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int dissect_lua(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree, void* data _U_) {
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int consumed_bytes = tvb_length(tvb);
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lua_pinfo = pinfo;
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lua_tvb = tvb;
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lua_tree = (struct _wslua_treeitem *)g_malloc(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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lua_tree->expired = FALSE;
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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,3,1,0) ) {
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proto_tree_add_expert_format(tree, pinfo, &ei_lua_error, tvb, 0, 0, "Lua Error: %s", lua_tostring(L,-1));
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} else {
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/* if the Lua dissector reported the consumed bytes, pass it to our caller */
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if (lua_isnumber(L, -1)) {
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/* we got the consumed bytes or the missing bytes as a negative number */
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consumed_bytes = (int) lua_tonumber(L, -1);
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lua_pop(L, 1);
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}
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}
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} else {
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proto_tree_add_expert_format(tree, pinfo, &ei_lua_error, tvb, 0, 0,
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"Lua Error: did not find the %s dissector in the dissectors table", pinfo->current_proto);
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}
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register_frame_end_routine(pinfo, lua_frame_end);
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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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return consumed_bytes;
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}
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static void iter_table_and_call(lua_State* LS, 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_getglobal(LS, table_name);
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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, WSLUA_INIT_ROUTINES,init_error_handler);
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}
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}
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static int prefs_changed_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 prefs apply callback:\n %s",error);
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return 0;
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}
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void wslua_prefs_changed(void) {
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if (L) {
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iter_table_and_call(L, WSLUA_PREFS_CHANGED,prefs_changed_error_handler);
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}
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}
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static const char *getF(lua_State *LS _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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static void wslua_add_plugin(gchar *name, gchar *version, gchar *filename)
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{
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wslua_plugin *new_plug, *lua_plug;
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lua_plug = wslua_plugin_list;
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new_plug = (wslua_plugin *)g_malloc(sizeof(wslua_plugin));
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if (!lua_plug) { /* the list is empty */
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wslua_plugin_list = new_plug;
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} else {
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while (lua_plug->next != NULL) {
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lua_plug = lua_plug->next;
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}
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lua_plug->next = new_plug;
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}
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new_plug->name = name;
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new_plug->version = version;
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new_plug->filename = filename;
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new_plug->next = NULL;
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}
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static gboolean lua_load_script(const gchar* filename) {
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FILE* file;
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int error;
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if (! ( file = ws_fopen(filename,"r")) ) {
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report_open_failure(filename,errno,FALSE);
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return FALSE;
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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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#if LUA_VERSION_NUM >= 502
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error = lua_load(L,getF,file,filename,NULL);
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#else
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error = lua_load(L,getF,file,filename);
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#endif
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switch (error) {
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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 TRUE;
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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 FALSE;
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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 FALSE;
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default:
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report_failure("Lua: unknown error during execution of %s: %d",filename,error);
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fclose(file);
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return FALSE;
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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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/** g_error() does an abort() and thus never returns **/
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return 0; /* keep gcc happy */
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}
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static int lua_load_plugins(const char *dirname, register_cb cb, gpointer client_data, gboolean count_only) {
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WS_DIR *dir; /* scanned directory */
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WS_DIRENT *file; /* current file */
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gchar *filename, *dot;
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const gchar *name;
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int plugins_counter = 0;
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if ((dir = ws_dir_open(dirname, 0, NULL)) != NULL) {
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while ((file = ws_dir_read_name(dir)) != NULL) {
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name = ws_dir_get_name(file);
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if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
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continue; /* skip "." and ".." */
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filename = g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s", dirname, name);
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if (test_for_directory(filename) == EISDIR) {
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plugins_counter += lua_load_plugins(filename, cb, client_data, count_only);
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g_free(filename);
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continue;
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}
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/* skip files starting wih . */
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if (name[0] == '.') {
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g_free(filename);
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continue;
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}
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/* skip anything but files with .lua suffix */
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dot = strrchr(name, '.');
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if (dot == NULL || g_ascii_strcasecmp(dot+1, "lua") != 0) {
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g_free(filename);
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continue;
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}
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if (file_exists(filename)) {
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if (!count_only) {
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if (cb)
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(*cb)(RA_LUA_PLUGINS, name, client_data);
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if (lua_load_script(filename)) {
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wslua_add_plugin(g_strdup(name), g_strdup(""), g_strdup(filename));
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}
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}
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plugins_counter++;
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}
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g_free(filename);
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}
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ws_dir_close(dir);
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}
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return plugins_counter;
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}
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int wslua_count_plugins(void) {
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gchar* filename;
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int plugins_counter;
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/* count global scripts */
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plugins_counter = lua_load_plugins(get_plugin_dir(), NULL, NULL, TRUE);
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/* count users init.lua */
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filename = get_persconffile_path("init.lua", FALSE);
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if ((file_exists(filename))) {
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plugins_counter++;
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}
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g_free(filename);
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/* count user scripts */
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filename = get_plugins_pers_dir();
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plugins_counter += lua_load_plugins(filename, NULL, NULL, TRUE);
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g_free(filename);
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/* count scripts from command line */
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plugins_counter += ex_opt_count("lua_script");
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return plugins_counter;
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}
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int wslua_init(register_cb cb, gpointer client_data) {
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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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expert_module_t* expert_lua;
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static ei_register_info ei[] = {
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{ &ei_lua_error, { "_ws.lua.error", PI_UNDECODED, PI_ERROR ,"Lua Error", EXPFILL }},
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};
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/* set up the logger */
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g_log_set_handler(LOG_DOMAIN_LUA, (GLogLevelFlags)(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,
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NULL);
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if (!L) {
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L = luaL_newstate();
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}
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WSLUA_INIT(L);
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proto_lua = proto_register_protocol("Lua Dissection", "Lua Dissection", "_ws.lua");
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expert_lua = expert_register_protocol(proto_lua);
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expert_register_field_array(expert_lua, ei, array_length(ei));
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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_newtable (L);
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lua_setglobal(L, WSLUA_INIT_ROUTINES);
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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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/* the preferences apply_cb table (accessible by the user) */
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lua_newtable (L);
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lua_setglobal(L, WSLUA_PREFS_CHANGED);
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/* set running_superuser variable to its proper value */
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WSLUA_REG_GLOBAL_BOOL(L,"running_superuser",started_with_special_privs());
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/* special constant used by PDU reassembly handling */
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/* see dissect_lua() for notes */
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WSLUA_REG_GLOBAL_NUMBER(L,"DESEGMENT_ONE_MORE_SEGMENT",DESEGMENT_ONE_MORE_SEGMENT);
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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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g_free(filename);
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filename = NULL;
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/* check if lua is to be disabled */
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lua_getglobal(L,"disable_lua");
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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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/* load global scripts */
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lua_load_plugins(get_plugin_dir(), cb, client_data, FALSE);
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/* check whether we should run other scripts even if running superuser */
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lua_getglobal(L,"run_user_scripts_when_superuser");
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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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/* load users init.lua */
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filename = get_persconffile_path("init.lua", FALSE);
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if ((file_exists(filename))) {
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if (cb)
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(*cb)(RA_LUA_PLUGINS, get_basename(filename), client_data);
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lua_load_script(filename);
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}
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g_free(filename);
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/* load user scripts */
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filename = get_plugins_pers_dir();
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lua_load_plugins(filename, cb, client_data, FALSE);
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g_free(filename);
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/* load scripts from command line */
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while((filename = (gchar *)ex_opt_get_next("lua_script"))) {
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if (cb)
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(*cb)(RA_LUA_PLUGINS, get_basename(filename), client_data);
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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_pushcfunction(L, wslua_not_register_menu);
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lua_setglobal(L, "register_menu");
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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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Proto_commit(L);
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return 0;
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}
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int wslua_cleanup(void) {
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/* cleanup 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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lua_State* wslua_state(void) { return L; }
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=4 expandtab:
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* :indentSize=4:tabSize=4:noTabs=true:
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*/
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