forked from osmocom/wireshark
f348cd5678
svn path=/trunk/; revision=52000
324 lines
9.4 KiB
C
324 lines
9.4 KiB
C
/*
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* wslua_listener.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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* Implementation of tap Listeners
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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 <epan/emem.h>
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/* WSLUA_MODULE Listener Post-dissection packet analysis */
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#include "wslua.h"
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WSLUA_CLASS_DEFINE(Listener,NOP,NOP);
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/*
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A Listener, is called once for every packet that matches a certain filter or has a certain tap.
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It can read the tree, the packet's Tvb eventually the tapped data but it cannot
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add elements to the tree.
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*/
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static 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 Listener Packet Callback",lua_pinfo->fd->num) :
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ep_strdup_printf("Lua: Error During execution of Listener 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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static int lua_tap_packet(void *tapdata, packet_info *pinfo, epan_dissect_t *edt, const void *data) {
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Listener tap = (Listener)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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if (tap->extractor) {
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tap->extractor(tap->L,data);
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} else {
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lua_pushnil(tap->L);
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}
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lua_pinfo = pinfo;
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lua_tvb = edt->tvb;
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lua_tree = (struct _wslua_treeitem *)g_malloc(sizeof(struct _wslua_treeitem));
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lua_tree->tree = edt->tree;
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lua_tree->item = NULL;
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lua_tree->expired = FALSE;
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switch ( lua_pcall(tap->L,3,1,1) ) {
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case 0:
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retval = luaL_optint(tap->L,-1,1);
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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 listener tap callback packet");
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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_Pinfo();
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clear_outstanding_Tvb();
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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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static 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 Listener init Callback:\n %s",error);
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return 1;
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}
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static void lua_tap_reset(void *tapdata) {
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Listener tap = (Listener)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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switch ( lua_pcall(tap->L,0,0,1) ) {
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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 a listener's init()");
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break;
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case LUA_ERRMEM:
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g_warning("Memory alloc error while calling a listener's init()");
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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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static void lua_tap_draw(void *tapdata) {
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Listener tap = (Listener)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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switch ( lua_pcall(tap->L,0,0,1) ) {
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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 a listener's draw(): %s",error);
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break;
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case LUA_ERRMEM:
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g_warning("Memory alloc error while calling a listener's draw()");
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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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WSLUA_CONSTRUCTOR Listener_new(lua_State* L) {
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/* Creates a new Listener listener */
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#define WSLUA_OPTARG_Listener_new_TAP 1 /* The name of this tap */
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#define WSLUA_OPTARG_Listener_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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const gchar* tap_type = luaL_optstring(L,WSLUA_OPTARG_Listener_new_TAP,"frame");
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const gchar* filter = luaL_optstring(L,WSLUA_OPTARG_Listener_new_FILTER,NULL);
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Listener tap;
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GString* error;
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tap = (Listener)g_malloc(sizeof(struct _wslua_tap));
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tap->name = g_strdup(tap_type);
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tap->filter = filter ? g_strdup(filter) : NULL;
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tap->extractor = wslua_get_tap_extractor(tap_type);
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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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/*
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* XXX - do all Lua taps require the protocol tree? If not, it might
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* be useful to have a way to indicate whether any do.
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*
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* XXX - do any Lua taps require the columns? If so, we either need
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* to request them for this tap, or do so if any Lua taps require them.
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*/
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error = register_tap_listener(tap_type, tap, tap->filter, TL_REQUIRES_PROTO_TREE, lua_tap_reset, lua_tap_packet, lua_tap_draw);
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if (error) {
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g_free(tap->filter);
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g_free(tap->name);
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g_free(tap);
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/* WSLUA_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); /* XXX LEAK? */
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}
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pushListener(L,tap);
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WSLUA_RETURN(1); /* The newly created Listener listener object */
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}
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WSLUA_METHOD Listener_remove(lua_State* L) {
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/* Removes a tap listener */
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Listener tap = checkListener(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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WSLUA_METAMETHOD Listener__tostring(lua_State* L) {
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/* Generates a string of debug info for the tap listener */
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Listener tap = checkListener(L,1);
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gchar* str;
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if (!tap) return 0;
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str = ep_strdup_printf("Listener(%s) filter: %s",tap->name, tap->filter ? tap->filter : "NONE");
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lua_pushstring(L,str);
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return 1;
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}
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static int Listener__newindex(lua_State* L) {
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/* WSLUA_ATTRIBUTE Listener_packet WO A function that will be called once every packet matches the Listener listener filter.
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function tap.packet(pinfo,tvb,tapinfo) ... end
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Note: tapinfo is a table of info based on the Listener's type, or nil.
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*/
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/* WSLUA_ATTRIBUTE Listener_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 only at the very end of the capture file.
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function tap.draw() ... end
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*/
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/* WSLUA_ATTRIBUTE Listener_reset WO A function that will be called at the end of the capture run.
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function tap.reset() ... end
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*/
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Listener tap = shiftListener(L,1);
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const gchar* idx = lua_shiftstring(L,1);
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int* refp = NULL;
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if (!idx) return 0;
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if (g_str_equal(idx,"packet")) {
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refp = &(tap->packet_ref);
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} else if (g_str_equal(idx,"draw")) {
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refp = &(tap->draw_ref);
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} else if (g_str_equal(idx,"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",idx);
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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,"Listener'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 int Listener__gc(lua_State* L _U_) {
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/* do NOT free Listener, it's never free'd */
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return 0;
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}
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static const luaL_Reg Listener_methods[] = {
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{"new", Listener_new},
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{"remove", Listener_remove},
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{ NULL, NULL }
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};
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static const luaL_Reg Listener_meta[] = {
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{"__tostring", Listener__tostring},
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{"__newindex", Listener__newindex},
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{ NULL, NULL }
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};
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int Listener_register(lua_State* L) {
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wslua_set_tap_enums(L);
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WSLUA_REGISTER_CLASS(Listener);
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return 1;
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}
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