forked from osmocom/wireshark
329 lines
9.3 KiB
C
329 lines
9.3 KiB
C
/*
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* lua_tap.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 "elua.h"
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ELUA_CLASS_DEFINE(Tap,NOP)
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/*
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A Tap Listener, is once for called every packet that matches a certain filter.
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It can read the tree and the packet's buffer but it cannot add elements to the tree.
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*/
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struct _eth_tap {
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gchar* name;
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gchar* filter;
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lua_State* L;
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int packet_ref;
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int draw_ref;
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int init_ref;
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int data_ref;
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};
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int tap_packet_cb_error_handler(lua_State* L) {
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const gchar* error = lua_tostring(L,1);
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static gchar* last_error = NULL;
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static int repeated = 0;
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static int next = 2;
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const gchar* where = (lua_pinfo) ?
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ep_strdup_printf("Lua: on packet %i Error During execution of Tap Packet Callback",lua_pinfo->fd->num) :
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ep_strdup_printf("Lua: Error During execution of Tap Packet Callback") ;
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/* show the error the 1st, 3rd, 5th, 9th, 17th, 33th... time it appears to avoid window flooding */
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/* XXX the last series of identical errors won't be shown (the user however gets at least one message) */
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if (! last_error) {
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report_failure("%s:\n%s",where,error);
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last_error = g_strdup(error);
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repeated = 0;
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next = 2;
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return 0;
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}
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if (g_str_equal(last_error,error) ) {
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repeated++;
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if ( repeated == next ) {
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report_failure("%s happened %i times:\n %s",where,repeated,error);
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next *= 2;
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}
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} else {
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report_failure("%s happened %i times:\n %s",where,repeated,last_error);
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g_free(last_error);
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last_error = g_strdup(error);
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repeated = 0;
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next = 2;
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report_failure("%s:\n %s",where,error);
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}
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return 0;
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}
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int lua_tap_packet(void *tapdata, packet_info *pinfo, epan_dissect_t *edt, const void *data _U_) {
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Tap tap = tapdata;
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int retval = 0;
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if (tap->packet_ref == LUA_NOREF) return 0;
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lua_settop(tap->L,0);
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lua_pushcfunction(tap->L,tap_packet_cb_error_handler);
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lua_rawgeti(tap->L, LUA_REGISTRYINDEX, tap->packet_ref);
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push_Pinfo(tap->L, pinfo);
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push_Tvb(tap->L, edt->tvb);
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lua_rawgeti(tap->L, LUA_REGISTRYINDEX, tap->data_ref);
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lua_pinfo = pinfo;
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lua_tvb = edt->tvb;
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lua_tree = ep_alloc(sizeof(struct _eth_treeitem));
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lua_tree->tree = edt->tree;
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lua_tree->item = NULL;
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switch ( lua_pcall(tap->L,3,1,1) ) {
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case 0:
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if (lua_gettop(tap->L) == 1)
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retval = luaL_checkint(tap->L,1);
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else
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retval = 1;
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break;
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case LUA_ERRRUN:
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break;
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case LUA_ERRMEM:
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g_warning("Memory alloc error while calling %s.packet() ",tap->name);
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break;
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default:
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g_assert_not_reached();
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break;
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}
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clear_outstanding_pinfos();
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clear_outstanding_tvbs();
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lua_pinfo = NULL;
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lua_tvb = NULL;
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lua_tree = NULL;
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return retval;
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}
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int tap_reset_cb_error_handler(lua_State* L) {
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const gchar* error = lua_tostring(L,1);
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report_failure("Lua: Error During execution of Tap init Callback:\n %s",error);
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return 1;
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}
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void lua_tap_reset(void *tapdata) {
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Tap tap = tapdata;
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if (tap->init_ref == LUA_NOREF) return;
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lua_pushcfunction(tap->L,tap_reset_cb_error_handler);
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lua_rawgeti(tap->L, LUA_REGISTRYINDEX, tap->init_ref);
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lua_rawgeti(tap->L, LUA_REGISTRYINDEX, tap->data_ref);
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switch ( lua_pcall(tap->L,1,0,1) ) {
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case 0:
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break;
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case LUA_ERRRUN:
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g_warning("Runtime error while calling %s.init() ",tap->name);
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break;
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case LUA_ERRMEM:
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g_warning("Memory alloc error while calling %s.init() ",tap->name);
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break;
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default:
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g_assert_not_reached();
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break;
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}
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}
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int tap_draw_cb_error_handler(lua_State* L) {
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const gchar* error = lua_tostring(L,1);
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report_failure("Lua: Error During execution of Tap Draw Callback:\n %s",error);
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return 1;
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}
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void lua_tap_draw(void *tapdata) {
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Tap tap = tapdata;
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const gchar* error;
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if (tap->draw_ref == LUA_NOREF) return;
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lua_pushcfunction(tap->L,tap_reset_cb_error_handler);
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lua_rawgeti(tap->L, LUA_REGISTRYINDEX, tap->draw_ref);
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lua_rawgeti(tap->L, LUA_REGISTRYINDEX, tap->data_ref);
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switch ( lua_pcall(tap->L,1,0,1) ) {
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case 0:
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/* OK */
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break;
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case LUA_ERRRUN:
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error = lua_tostring(tap->L,-1);
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g_warning("Runtime error while calling %s.draw(): %s",tap->name,error);
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break;
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case LUA_ERRMEM:
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g_warning("Memory alloc error while calling %s.draw() ",tap->name);
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break;
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default:
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g_assert_not_reached();
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break;
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}
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}
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ELUA_CONSTRUCTOR Tap_new(lua_State* L) {
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/* Creates a new Tap listener */
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#define ELUA_ARG_Tap_new_NAME 1 /* the name of the tap */
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#define ELUA_ARG_Tap_new_FILTER 2 /* a filter that when matches the tap.packet function gets called (use nil to be called for every packet) */
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#define ELUA_OPTARG_Tap_new_USERDATA 3 /* a datum that will be passed as last argument to all tap functions when they get called */
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const gchar* name = luaL_checkstring(L,ELUA_ARG_Tap_new_NAME);
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const gchar* filter = luaL_optstring(L,ELUA_ARG_Tap_new_FILTER,NULL);
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Tap tap;
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GString* error;
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if (!name) ELUA_ARG_ERROR(Tap_new,NAME,"must be a string");
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tap = g_malloc(sizeof(struct _eth_tap));
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tap->name = g_strdup(name);
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tap->filter = filter ? g_strdup(filter) : NULL;
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tap->L = L;
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tap->packet_ref = LUA_NOREF;
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tap->draw_ref = LUA_NOREF;
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tap->init_ref = LUA_NOREF;
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if (lua_gettop(L) > 2) {
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lua_pushvalue(L, ELUA_OPTARG_Tap_new_USERDATA);
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tap->data_ref = luaL_ref(L, LUA_REGISTRYINDEX);
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} else {
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tap->data_ref = LUA_NOREF;
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}
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error = register_tap_listener("frame", tap, tap->filter, lua_tap_reset, lua_tap_packet, lua_tap_draw);
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if (error) {
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/* ELUA_ERROR(new_tap,"tap registration error"); */
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luaL_error(L,"Error while registering tap:\n%s",error->str);
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g_string_free(error,TRUE);
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if (tap->filter) g_free(tap->filter);
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g_free(tap->name);
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luaL_unref(L, LUA_REGISTRYINDEX, tap->data_ref);
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g_free(tap);
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}
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pushTap(L,tap);
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ELUA_RETURN(1); /* The newly created Tap listener object */
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}
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ELUA_METHOD Tap_remove(lua_State* L) {
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/* Removes a tap listener */
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Tap tap = checkTap(L,1);
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if (!tap) return 0;
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remove_tap_listener(tap);
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return 0;
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}
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static int Tap_tostring(lua_State* L) {
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Tap tap = checkTap(L,1);
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gchar* str;
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if (!tap) return 0;
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str = g_strdup_printf("Tap->%s filter: %s",tap->name, tap->filter ? tap->filter : "NONE");
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lua_pushstring(L,str);
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g_free(str);
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return 1;
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}
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static int Tap_newindex(lua_State* L) {
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/* ELUA_ATTRIBUTE Tap_packet WO A function that will be called once every packet matches the Tap listener filter.
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function tap.packet(pinfo,tvb,userdata) ... end
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*/
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/* ELUA_ATTRIBUTE Tap_draw WO A function that will be called once every few seconds to redraw the gui objects
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in tshark this funtion is called oly at the very end of the capture file.
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function tap.draw(userdata) ... end
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*/
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/* ELUA_ATTRIBUTE Tap_reset WO A function that will be called at the end of the capture run.
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function tap.reset(userdata) ... end
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*/
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Tap tap = shiftTap(L,1);
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const gchar* index = lua_shiftstring(L,1);
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int* refp = NULL;
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if (!index) return 0;
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if (g_str_equal(index,"packet")) {
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refp = &(tap->packet_ref);
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} else if (g_str_equal(index,"draw")) {
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refp = &(tap->draw_ref);
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} else if (g_str_equal(index,"reset")) {
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refp = &(tap->init_ref);
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} else {
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luaL_error(L,"No such attribute `%s' for a tap",index);
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return 0;
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}
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if (! lua_isfunction(L,1)) {
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luaL_error(L,"Tap's attribute `%s' must be a function");
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return 0;
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}
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lua_pushvalue(L, 1);
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*refp = luaL_ref(L, LUA_REGISTRYINDEX);
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return 0;
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}
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static const luaL_reg Tap_methods[] = {
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{"new", Tap_new},
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{"remove", Tap_remove},
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{0, 0}
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};
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static const luaL_reg Tap_meta[] = {
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{"__tostring", Tap_tostring},
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{"__newindex", Tap_newindex},
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{0, 0}
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};
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int Tap_register(lua_State* L) {
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ELUA_REGISTER_CLASS(Tap);
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return 1;
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}
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