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wireshark/plugins/lua/packet-lua.c
Luis Ontanon 9fd26b71ef * DissectorTable.add does not allow to add lua protocols that don't have a dissector. 
* ProtoFiled.uint checks the base to be a valid value to avoid an assertion in proto.c while registering the field array
* save one lua table lookup by using a reference to the dissectors table instead of looking for it by name
* set data_hanlde's value to avoid a crash while invoking it.
* make the TvbRange of Tree:add_item really optional. 


svn path=/trunk/; revision=17220
2006-02-08 23:26:52 +00:00

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/*
* packet-lua.c
*
* Ethereal's interface to the Lua Programming Language
*
* (c) 2006, Luis E. Garcia Ontanon <luis.ontanon@gmail.com>
*
* $Id$
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "packet-lua.h"
#include <epan/nstime.h>
#include <math.h>
#include <epan/expert.h>
#include <epan/ex-opt.h>
#include <epan/privileges.h>
static lua_State* L = NULL;
packet_info* lua_pinfo;
proto_tree* lua_tree;
tvbuff_t* lua_tvb;
int lua_malformed;
int lua_dissectors_table_ref;
dissector_handle_t lua_data_handle;
const gchar* lua_shiftstring(lua_State* L, int i) {
const gchar* p = luaL_checkstring(L, i);
if (p) {
lua_remove(L,i);
return p;
} else {
return NULL;
}
}
static int lua_format_date(lua_State* LS) {
lua_Number time = luaL_checknumber(LS,1);
nstime_t then;
gchar* str;
then.secs = (guint32)floor(time);
then.nsecs = (guint32) ( (time-(double)(then.secs))*1000000000);
str = abs_time_to_str(&then);
lua_pushstring(LS,str);
return 1;
}
static int lua_format_time(lua_State* LS) {
lua_Number time = luaL_checknumber(LS,1);
nstime_t then;
gchar* str;
then.secs = (guint32)floor(time);
then.nsecs = (guint32) ( (time-(double)(then.secs))*1000000000);
str = rel_time_to_str(&then);
lua_pushstring(LS,str);
return 1;
}
static int lua_report_failure(lua_State* LS) {
const gchar* s = luaL_checkstring(LS,1);
report_failure("%s",s);
return 0;
}
static int lua_not_register_menu(lua_State* L) {
luaL_error(L,"too late to register a menu");
return 0;
}
void dissect_lua(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree) {
lua_pinfo = pinfo;
lua_tree = tree;
lua_tvb = tvb;
/*
* almost equivalent to Lua:
* dissectors[current_proto](tvb,pinfo,tree)
*/
lua_settop(L,0);
lua_rawgeti(L, LUA_REGISTRYINDEX, lua_dissectors_table_ref);
lua_pushstring(L, pinfo->current_proto);
lua_gettable(L, -2);
lua_remove(L,1);
if (lua_isfunction(L,1)) {
pushTvb(L,tvb);
pushPinfo(L,pinfo);
pushProtoTree(L,tree);
if ( lua_pcall(L,3,0,0) ) {
const gchar* error = lua_tostring(L,-1);
proto_item* pi = proto_tree_add_text(tree,tvb,0,0,"Lua Error: %s",error);
expert_add_info_format(pinfo, pi, PI_DEBUG, PI_ERROR ,"Lua Error");
}
} else {
proto_item* pi = proto_tree_add_text(tree,tvb,0,0,"Lua Error: did not find the %s dissector"
" in the dissectors table",pinfo->current_proto);
expert_add_info_format(pinfo, pi, PI_DEBUG, PI_ERROR ,"Lua Error");
}
lua_pinfo = NULL;
lua_tree = NULL;
lua_tvb = NULL;
}
static void iter_table_and_call(lua_State* LS, int env, const gchar* table_name, lua_CFunction error_handler) {
lua_settop(LS,0);
lua_pushcfunction(LS,error_handler);
lua_pushstring(LS, table_name);
lua_gettable(LS, env);
if (!lua_istable(LS, 2)) {
report_failure("Lua: either `%s' does not exist or it is not a table!\n",table_name);
lua_close(LS);
L = NULL;
return;
}
lua_pushnil(LS);
while (lua_next(LS, 2)) {
const gchar* name = lua_tostring(L,-2);
if (lua_isfunction(LS,-1)) {
if ( lua_pcall(LS,0,0,1) ) {
lua_pop(LS,1);
}
} else {
report_failure("Lua: Something not a function got its way into the %s.%s",table_name,name);
lua_close(LS);
L = NULL;
return;
}
}
lua_settop(LS,0);
}
gboolean lua_initialized = FALSE;
static int init_error_handler(lua_State* L) {
const gchar* error = lua_tostring(L,1);
report_failure("Lua: Error During execution of Initialization:\n %s",error);
return 0;
}
static void init_lua(void) {
if ( ! lua_initialized ) {
lua_prime_all_fields(NULL);
lua_register_subtrees();
lua_initialized = TRUE;
}
if (L) {
iter_table_and_call(L, LUA_GLOBALSINDEX, LUA_INIT_ROUTINES,init_error_handler);
}
}
static const char *getF(lua_State *L _U_, void *ud, size_t *size)
{
FILE *f=(FILE *)ud;
static char buff[512];
if (feof(f)) return NULL;
*size=fread(buff,1,sizeof(buff),f);
return (*size>0) ? buff : NULL;
}
static int lua_main_error_handler(lua_State* LS) {
const gchar* error = lua_tostring(LS,1);
report_failure("Lua: Error during loading:\n %s",error);
return 0;
}
void lua_load_script(const gchar* filename) {
FILE* file;
if (! ( file = fopen(filename,"r")) ) {
report_open_failure(filename,errno,FALSE);
return;
}
lua_settop(L,0);
lua_pushcfunction(L,lua_main_error_handler);
switch (lua_load(L,getF,file,filename)) {
case 0:
lua_pcall(L,0,0,1);
fclose(file);
return;
case LUA_ERRSYNTAX: {
report_failure("Lua: syntax error during precompilation of `%s':\n%s",filename,lua_tostring(L,-1));
fclose(file);
return;
}
case LUA_ERRMEM:
report_failure("Lua: memory allocation error during execution of %s",filename);
fclose(file);
return;
}
}
void register_lua(void) {
const gchar* filename;
GPtrArray* filenames = g_ptr_array_new();
guint i;
filename = get_datafile_path("init.lua");
if (( file_exists(filename))) {
g_ptr_array_add(filenames,(void*)filename);
}
if (! started_with_special_privs() ) {
filename = get_persconffile_path("init.lua", FALSE);
if (( file_exists(filename))) {
g_ptr_array_add(filenames,(void*)filename);
}
while((filename = ex_opt_get_next("lua_script"))) {
g_ptr_array_add(filenames,(void*)filename);
}
}
if (! filenames->len) {
g_ptr_array_free(filenames,TRUE);
return;
}
register_init_routine(init_lua);
L = lua_open();
luaopen_base(L);
luaopen_table(L);
luaopen_io(L);
luaopen_string(L);
ProtoField_register(L);
ProtoFieldArray_register(L);
SubTree_register(L);
ByteArray_register(L);
Tvb_register(L);
TvbRange_register(L);
Proto_register(L);
Column_register(L);
Pinfo_register(L);
ProtoTree_register(L);
ProtoItem_register(L);
Dissector_register(L);
DissectorTable_register(L);
Field_register(L);
Columns_register(L);
Tap_register(L);
Address_register(L);
TextWindow_register(L);
lua_pushstring(L, "format_date");
lua_pushcfunction(L, lua_format_date);
lua_settable(L, LUA_GLOBALSINDEX);
lua_pushstring(L, "format_time");
lua_pushcfunction(L, lua_format_time);
lua_settable(L, LUA_GLOBALSINDEX);
lua_pushstring(L, "report_failure");
lua_pushcfunction(L, lua_report_failure);
lua_settable(L, LUA_GLOBALSINDEX);
lua_pushstring(L, "register_menu");
lua_pushcfunction(L, lua_register_menu);
lua_settable(L, LUA_GLOBALSINDEX);
lua_pushstring(L, "gui_enabled");
lua_pushcfunction(L, lua_gui_enabled);
lua_settable(L, LUA_GLOBALSINDEX);
lua_pushstring(L, "dialog");
lua_pushcfunction(L, lua_new_dialog);
lua_settable(L, LUA_GLOBALSINDEX);
lua_pushstring(L, LUA_INIT_ROUTINES);
lua_newtable (L);
lua_settable(L, LUA_GLOBALSINDEX);
lua_newtable (L);
lua_dissectors_table_ref = luaL_ref(L, LUA_REGISTRYINDEX);
for (i=0 ; i < filenames->len ; i++) {
filename = g_ptr_array_index(filenames,i);
lua_load_script(filename);
}
g_ptr_array_free(filenames,TRUE);
/* after the body it is too late to register a menu */
lua_pushstring(L, "register_menu");
lua_pushcfunction(L, lua_not_register_menu);
lua_settable(L, LUA_GLOBALSINDEX);
lua_pinfo = NULL;
lua_tree = NULL;
lua_tvb = NULL;
lua_data_handle = find_dissector("data");
lua_malformed = proto_get_id_by_filter_name("malformed");
return;
}
void proto_register_lua(void)
{
register_final_registration_routine(register_lua);
}
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