forked from osmocom/wireshark
![Hadriel Kaplan](/assets/img/avatar_default.png)
This enhances the Lua API doc generator Perl script to handle meta-information in description comments, such as bold, italics, raw code, version info, etc. The supported markup and codes are documented in make-wsluarm.pl. It's not beautiful Perl code (I don't know Perl), and I'd rather do it using Lua, but I think keeping it Perl makes more sense in the long run. Change-Id: I477b3ebe770075dcea9ec52708e2d6fb5758d2f4 Reviewed-on: https://code.wireshark.org/review/802 Reviewed-by: Hadriel Kaplan <hadrielk@yahoo.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
631 lines
19 KiB
C
631 lines
19 KiB
C
/*
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* wslua_field.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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* 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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#include <epan/dfilter/dfilter.h>
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#include <epan/ftypes/ftypes-int.h>
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/* WSLUA_MODULE Field Obtaining dissection data */
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#include "wslua.h"
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/* any call to checkFieldInfo() will now error on null or expired, so no need to check again */
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WSLUA_CLASS_DEFINE(FieldInfo,FAIL_ON_NULL_OR_EXPIRED("FieldInfo"),NOP);
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/*
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An extracted Field from dissected packet data. A `FieldInfo` object can only be used within
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the callback functions of dissectors, post-dissectors, heuristic-dissectors, and taps.
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A `FieldInfo` can be called on either existing Wireshark fields by using either `Field.new()`
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or `Field()` before-hand, or it can be called on new fields created by Lua from a `ProtoField`.
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*/
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static GPtrArray* outstanding_FieldInfo = NULL;
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#define PUSH_FIELDINFO(L,fi) {g_ptr_array_add(outstanding_FieldInfo,fi);pushFieldInfo(L,fi);}
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CLEAR_OUTSTANDING(FieldInfo,expired,TRUE)
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/* WSLUA_ATTRIBUTE FieldInfo_len RO The length of this field. */
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WSLUA_METAMETHOD FieldInfo__len(lua_State* L) {
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/*
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Obtain the Length of the field
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*/
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FieldInfo fi = checkFieldInfo(L,1);
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lua_pushnumber(L,fi->ws_fi->length);
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return 1;
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}
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/* WSLUA_ATTRIBUTE FieldInfo_offset RO The offset of this field. */
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WSLUA_METAMETHOD FieldInfo__unm(lua_State* L) {
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/*
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Obtain the Offset of the field
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*/
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FieldInfo fi = checkFieldInfo(L,1);
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lua_pushnumber(L,fi->ws_fi->start);
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return 1;
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}
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/* WSLUA_ATTRIBUTE FieldInfo_value RO The value of this field. */
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WSLUA_METAMETHOD FieldInfo__call(lua_State* L) {
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/*
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Obtain the Value of the field
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*/
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FieldInfo fi = checkFieldInfo(L,1);
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switch(fi->ws_fi->hfinfo->type) {
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case FT_BOOLEAN:
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lua_pushboolean(L,(int)fvalue_get_uinteger(&(fi->ws_fi->value)));
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return 1;
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case FT_UINT8:
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case FT_UINT16:
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case FT_UINT24:
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case FT_UINT32:
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case FT_FRAMENUM:
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lua_pushnumber(L,(lua_Number)(fvalue_get_uinteger(&(fi->ws_fi->value))));
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return 1;
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case FT_INT8:
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case FT_INT16:
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case FT_INT24:
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case FT_INT32:
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lua_pushnumber(L,(lua_Number)(fvalue_get_sinteger(&(fi->ws_fi->value))));
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return 1;
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case FT_FLOAT:
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case FT_DOUBLE:
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lua_pushnumber(L,(lua_Number)(fvalue_get_floating(&(fi->ws_fi->value))));
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return 1;
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case FT_INT64: {
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pushInt64(L,(Int64)(fvalue_get_integer64(&(fi->ws_fi->value))));
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return 1;
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}
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case FT_UINT64: {
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pushUInt64(L,fvalue_get_integer64(&(fi->ws_fi->value)));
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return 1;
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}
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case FT_ETHER: {
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Address eth = (Address)g_malloc(sizeof(address));
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eth->type = AT_ETHER;
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eth->len = fi->ws_fi->length;
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eth->data = tvb_memdup(NULL,fi->ws_fi->ds_tvb,fi->ws_fi->start,fi->ws_fi->length);
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pushAddress(L,eth);
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return 1;
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}
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case FT_IPv4:{
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Address ipv4 = (Address)g_malloc(sizeof(address));
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ipv4->type = AT_IPv4;
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ipv4->len = fi->ws_fi->length;
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ipv4->data = tvb_memdup(NULL,fi->ws_fi->ds_tvb,fi->ws_fi->start,fi->ws_fi->length);
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pushAddress(L,ipv4);
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return 1;
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}
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case FT_IPv6: {
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Address ipv6 = (Address)g_malloc(sizeof(address));
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ipv6->type = AT_IPv6;
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ipv6->len = fi->ws_fi->length;
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ipv6->data = tvb_memdup(NULL,fi->ws_fi->ds_tvb,fi->ws_fi->start,fi->ws_fi->length);
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pushAddress(L,ipv6);
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return 1;
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}
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case FT_IPXNET:{
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Address ipx = (Address)g_malloc(sizeof(address));
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ipx->type = AT_IPX;
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ipx->len = fi->ws_fi->length;
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ipx->data = tvb_memdup(NULL,fi->ws_fi->ds_tvb,fi->ws_fi->start,fi->ws_fi->length);
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pushAddress(L,ipx);
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return 1;
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}
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case FT_ABSOLUTE_TIME:
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case FT_RELATIVE_TIME: {
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NSTime nstime = (NSTime)g_malloc(sizeof(nstime_t));
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*nstime = *(NSTime)fvalue_get(&(fi->ws_fi->value));
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pushNSTime(L,nstime);
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return 1;
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}
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case FT_STRING:
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case FT_STRINGZ: {
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gchar* repr = fvalue_to_string_repr(&fi->ws_fi->value,FTREPR_DISPLAY,NULL);
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if (repr)
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lua_pushstring(L,repr);
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else
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luaL_error(L,"field cannot be represented as string because it may contain invalid characters");
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return 1;
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}
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case FT_NONE:
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if (fi->ws_fi->length == 0) {
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lua_pushnil(L);
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return 1;
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}
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/* FALLTHROUGH */
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case FT_BYTES:
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case FT_UINT_BYTES:
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case FT_GUID:
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case FT_PROTOCOL:
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case FT_REL_OID:
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case FT_SYSTEM_ID:
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case FT_OID: {
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ByteArray ba = g_byte_array_new();
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g_byte_array_append(ba, (const guint8 *)tvb_memdup(wmem_packet_scope(),fi->ws_fi->ds_tvb,fi->ws_fi->start,fi->ws_fi->length),fi->ws_fi->length);
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pushByteArray(L,ba);
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return 1;
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}
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default:
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luaL_error(L,"FT_ not yet supported");
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return 1;
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}
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}
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/* WSLUA_ATTRIBUTE FieldInfo_label RO The string representing this field */
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WSLUA_METAMETHOD FieldInfo__tostring(lua_State* L) {
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/* The string representation of the field. */
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FieldInfo fi = checkFieldInfo(L,1);
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if (fi->ws_fi->value.ftype->val_to_string_repr) {
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gchar* repr = fvalue_to_string_repr(&fi->ws_fi->value,FTREPR_DISPLAY,NULL);
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if (repr) {
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lua_pushstring(L,repr);
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}
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else {
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lua_pushstring(L,"(unknown)");
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}
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}
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else if (fi->ws_fi->hfinfo->type == FT_NONE) {
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lua_pushstring(L, "(none)");
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}
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else {
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lua_pushstring(L,"(n/a)");
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}
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return 1;
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}
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/* WSLUA_ATTRIBUTE FieldInfo_display RO The string display of this field as seen in GUI */
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static int FieldInfo_get_display(lua_State* L) {
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/* The display string of this field as seen in GUI. */
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FieldInfo fi = checkFieldInfo(L,1);
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gchar label_str[ITEM_LABEL_LENGTH+1];
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gchar *label_ptr;
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gchar *value_ptr;
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if (!fi->ws_fi->rep) {
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label_ptr = label_str;
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proto_item_fill_label(fi->ws_fi, label_str);
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} else
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label_ptr = fi->ws_fi->rep->representation;
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if (!label_ptr) return 0;
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value_ptr = strstr(label_ptr, ": ");
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if (!value_ptr) {
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/* just use whatever's there */
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lua_pushstring(L, label_ptr);
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} else {
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value_ptr += 2; /* get past the ': ' */
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lua_pushstring(L, value_ptr);
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}
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return 1;
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}
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/* WSLUA_ATTRIBUTE FieldInfo_range RO The `TvbRange` covering this field */
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static int FieldInfo_get_range(lua_State* L) {
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/* The `TvbRange` covering this field. */
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FieldInfo fi = checkFieldInfo(L,1);
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if (push_TvbRange (L, fi->ws_fi->ds_tvb, fi->ws_fi->start, fi->ws_fi->length)) {
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return 1;
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}
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return 0;
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}
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/* WSLUA_ATTRIBUTE FieldInfo_generated RO Whether this field was marked as generated (boolean) */
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static int FieldInfo_get_generated(lua_State* L) {
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/* Whether this field was marked as generated. */
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FieldInfo fi = checkFieldInfo(L,1);
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lua_pushboolean(L,FI_GET_FLAG(fi->ws_fi, FI_GENERATED));
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return 1;
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}
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/* WSLUA_ATTRIBUTE FieldInfo_name RO The name of this field */
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static int FieldInfo_get_name(lua_State* L) {
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/* The filter name of this field. */
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FieldInfo fi = checkFieldInfo(L,1);
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lua_pushstring(L,fi->ws_fi->hfinfo->abbrev);
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return 1;
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}
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WSLUA_METAMETHOD FieldInfo__eq(lua_State* L) {
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/* Checks whether lhs is within rhs. */
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FieldInfo l = checkFieldInfo(L,1);
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FieldInfo r = checkFieldInfo(L,2);
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if (l->ws_fi->ds_tvb != r->ws_fi->ds_tvb) {
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WSLUA_ERROR(FieldInfo__eq,"Data source must be the same for both fields");
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return 0;
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}
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if (l->ws_fi->start <= r->ws_fi->start && r->ws_fi->start + r->ws_fi->length <= l->ws_fi->start + r->ws_fi->length) {
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lua_pushboolean(L,1);
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return 1;
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} else {
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return 0;
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}
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}
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WSLUA_METAMETHOD FieldInfo__le(lua_State* L) {
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/* Checks whether the end byte of lhs is before the end of rhs. */
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FieldInfo l = checkFieldInfo(L,1);
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FieldInfo r = checkFieldInfo(L,2);
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if (l->ws_fi->ds_tvb != r->ws_fi->ds_tvb)
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WSLUA_ERROR(FieldInfo__le,"Data source must be the same for both fields");
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if (r->ws_fi->start + r->ws_fi->length <= l->ws_fi->start + r->ws_fi->length) {
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lua_pushboolean(L,1);
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return 1;
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} else {
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return 0;
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}
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}
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WSLUA_METAMETHOD FieldInfo__lt(lua_State* L) {
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/* Checks whether the end byte of rhs is before the beginning of rhs. */
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FieldInfo l = checkFieldInfo(L,1);
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FieldInfo r = checkFieldInfo(L,2);
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if (l->ws_fi->ds_tvb != r->ws_fi->ds_tvb) {
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WSLUA_ERROR(FieldInfo__lt,"Data source must be the same for both fields");
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return 0;
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}
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if (r->ws_fi->start + r->ws_fi->length < l->ws_fi->start) {
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lua_pushboolean(L,1);
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return 1;
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} else {
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return 0;
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}
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}
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/* Gets registered as metamethod automatically by WSLUA_REGISTER_META */
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static int FieldInfo__gc(lua_State* L _U_) {
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FieldInfo fi = toFieldInfo(L,1);
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if (!fi) return 0;
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if (!fi->expired)
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fi->expired = TRUE;
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else
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/* do NOT free fi->ws_fi */
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g_free(fi);
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return 0;
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}
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/* This table is ultimately registered as a sub-table of the class' metatable,
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* and if __index/__newindex is invoked then it calls the appropriate function
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* from this table for getting/setting the members.
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*/
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WSLUA_ATTRIBUTES FieldInfo_attributes[] = {
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WSLUA_ATTRIBUTE_ROREG(FieldInfo,range),
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WSLUA_ATTRIBUTE_ROREG(FieldInfo,generated),
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WSLUA_ATTRIBUTE_ROREG(FieldInfo,name),
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WSLUA_ATTRIBUTE_ROREG(FieldInfo,display),
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{ "label", FieldInfo__tostring, NULL },
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{ "value", FieldInfo__call, NULL },
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{ "tvb", FieldInfo_get_range, NULL },
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{ "len", FieldInfo__len, NULL },
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{ "offset", FieldInfo__unm, NULL },
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{ NULL, NULL, NULL }
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};
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WSLUA_META FieldInfo_meta[] = {
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WSLUA_CLASS_MTREG(FieldInfo,tostring),
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WSLUA_CLASS_MTREG(FieldInfo,call),
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WSLUA_CLASS_MTREG(FieldInfo,len),
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WSLUA_CLASS_MTREG(FieldInfo,unm),
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WSLUA_CLASS_MTREG(FieldInfo,eq),
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WSLUA_CLASS_MTREG(FieldInfo,le),
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WSLUA_CLASS_MTREG(FieldInfo,lt),
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{ NULL, NULL }
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};
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int FieldInfo_register(lua_State* L) {
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WSLUA_REGISTER_META(FieldInfo);
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WSLUA_REGISTER_ATTRIBUTES(FieldInfo);
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return 0;
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}
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WSLUA_FUNCTION wslua_all_field_infos(lua_State* L) {
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/*
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Obtain all fields from the current tree. Note this only gets whatever fields the underlying
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dissectors have filled in for this packet at this time - there may be fields applicable to
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the packet that simply aren't being filled in because at this time they're not needed for anything.
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This function only gets what the C-side code has currently populated, not the full list.
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*/
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GPtrArray* found;
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int items_found = 0;
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guint i;
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if (! lua_tree || ! lua_tree->tree ) {
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WSLUA_ERROR(wslua_all_field_infos,"Cannot be called outside a listener or dissector");
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return 0;
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}
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found = proto_all_finfos(lua_tree->tree);
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if (found) {
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for (i=0; i<found->len; i++) {
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FieldInfo fi = (FieldInfo)g_malloc(sizeof(struct _wslua_field_info));
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fi->ws_fi = (field_info *)g_ptr_array_index(found,i);
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fi->expired = FALSE;
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PUSH_FIELDINFO(L,fi);
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items_found++;
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}
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g_ptr_array_free(found,TRUE);
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}
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return items_found;
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}
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WSLUA_CLASS_DEFINE(Field,FAIL_ON_NULL("Field"),NOP);
|
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/*
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A Field extractor to to obtain field values. A `Field` object can only be created *outside* of
|
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the callback functions of dissectors, post-dissectors, heuristic-dissectors, and taps.
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Once created, it is used *inside* the callback functions, to generate a `FieldInfo` object.
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*/
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static GPtrArray* wanted_fields = NULL;
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static dfilter_t* wslua_dfilter = NULL;
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/* We use a fake dfilter for Lua field extractors, so that
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* epan_dissect_run() will populate the fields. This won't happen
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* if the passed-in edt->tree is NULL, which it will be if the
|
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* proto_tree isn't created by epan_dissect_init(). But that's by
|
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* design - if shark doesn't pass in a proto_tree, it's probably for
|
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* a good reason and we shouldn't override that. (right?)
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*/
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void wslua_prime_dfilter(epan_dissect_t *edt) {
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if (wslua_dfilter && edt && edt->tree) {
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dfilter_prime_proto_tree(wslua_dfilter, edt->tree);
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}
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}
|
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|
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/*
|
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* field extractor registration is tricky, In order to allow
|
|
* the user to define them in the body of the script we will
|
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* populate the Field value with a pointer of the abbrev of it
|
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* to later replace it with the hfi.
|
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*
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* This will be added to the wanted_fields array that will
|
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* exists only while they can be defined, and be cleared right
|
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* after the fields are primed.
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*/
|
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void lua_prime_all_fields(proto_tree* tree _U_) {
|
|
GString* fake_tap_filter = g_string_new("frame");
|
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guint i;
|
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static gboolean fake_tap = FALSE;
|
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for(i=0; i < wanted_fields->len; i++) {
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Field f = (Field)g_ptr_array_index(wanted_fields,i);
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gchar* name = *((gchar**)f);
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*f = proto_registrar_get_byname(name);
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if (!*f) {
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report_failure("Could not find field `%s'",name);
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*f = NULL;
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g_free(name);
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continue;
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}
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g_free(name);
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g_string_append_printf(fake_tap_filter," || %s",(*f)->abbrev);
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fake_tap = TRUE;
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}
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|
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g_ptr_array_free(wanted_fields,TRUE);
|
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wanted_fields = NULL;
|
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|
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if (fake_tap) {
|
|
/* a boring tap :-) */
|
|
GString* error = register_tap_listener("frame",
|
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&fake_tap,
|
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fake_tap_filter->str,
|
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0, /* XXX - do we need the protocol tree or columns? */
|
|
NULL, NULL, NULL);
|
|
|
|
if (error) {
|
|
report_failure("while registering lua_fake_tap:\n%s",error->str);
|
|
g_string_free(error,TRUE);
|
|
}
|
|
else if (!dfilter_compile(fake_tap_filter->str, &wslua_dfilter)) {
|
|
report_failure("while compiling dfilter for wslua: '%s'", fake_tap_filter->str);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
WSLUA_CONSTRUCTOR Field_new(lua_State *L) {
|
|
/*
|
|
Create a Field extractor.
|
|
*/
|
|
#define WSLUA_ARG_Field_new_FIELDNAME 1 /* The filter name of the field (e.g. ip.addr) */
|
|
const gchar* name = luaL_checkstring(L,WSLUA_ARG_Field_new_FIELDNAME);
|
|
Field f;
|
|
|
|
if (!name) return 0;
|
|
|
|
if (!proto_registrar_get_byname(name) && !wslua_is_field_available(L, name)) {
|
|
WSLUA_ARG_ERROR(Field_new,FIELDNAME,"a field with this name must exist");
|
|
return 0;
|
|
}
|
|
|
|
if (!wanted_fields) {
|
|
WSLUA_ERROR(Field_new,"A Field extractor must be defined before Taps or Dissectors get called");
|
|
return 0;
|
|
}
|
|
|
|
f = (Field)g_malloc(sizeof(void*));
|
|
*f = (header_field_info*)(void*)g_strdup(name); /* cheating */
|
|
|
|
g_ptr_array_add(wanted_fields,f);
|
|
|
|
pushField(L,f);
|
|
WSLUA_RETURN(1); /* The field extractor */
|
|
}
|
|
|
|
WSLUA_CONSTRUCTOR Field_list(lua_State *L) {
|
|
/* Gets a Lua array table of all registered field filter names.
|
|
|
|
NOTE: this is an expensive operation, and should only be used for troubleshooting.
|
|
|
|
@since 1.11.3
|
|
*/
|
|
void *cookie, *cookie2;
|
|
int i = -1;
|
|
int count = 0;
|
|
header_field_info *hfinfo = NULL;
|
|
|
|
lua_newtable(L);
|
|
|
|
for (i = proto_get_first_protocol(&cookie); i != -1;
|
|
i = proto_get_next_protocol(&cookie)) {
|
|
|
|
for (hfinfo = proto_get_first_protocol_field(i, &cookie2); hfinfo != NULL;
|
|
hfinfo = proto_get_next_protocol_field(&cookie2)) {
|
|
|
|
if (hfinfo->same_name_prev_id != -1) /* ignore duplicate names */
|
|
continue;
|
|
|
|
count++;
|
|
lua_pushstring(L,hfinfo->abbrev);
|
|
lua_rawseti(L,1,count);
|
|
}
|
|
}
|
|
|
|
WSLUA_RETURN(1); /* The array table of field filter names */
|
|
}
|
|
|
|
WSLUA_METAMETHOD Field__call (lua_State* L) {
|
|
/* Obtain all values (see `FieldInfo`) for this field. */
|
|
Field f = checkField(L,1);
|
|
header_field_info* in = *f;
|
|
int items_found = 0;
|
|
|
|
if (! in) {
|
|
luaL_error(L,"invalid field");
|
|
return 0;
|
|
}
|
|
|
|
if (! lua_pinfo ) {
|
|
WSLUA_ERROR(Field__call,"Fields cannot be used outside dissectors or taps");
|
|
return 0;
|
|
}
|
|
|
|
while (in) {
|
|
GPtrArray* found = proto_get_finfo_ptr_array(lua_tree->tree, in->id);
|
|
guint i;
|
|
if (found) {
|
|
for (i=0; i<found->len; i++) {
|
|
FieldInfo fi = (FieldInfo)g_malloc(sizeof(struct _wslua_field_info));
|
|
fi->ws_fi = (field_info *)g_ptr_array_index(found,i);
|
|
fi->expired = FALSE;
|
|
|
|
PUSH_FIELDINFO(L,fi);
|
|
items_found++;
|
|
}
|
|
}
|
|
in = (in->same_name_prev_id != -1) ? proto_registrar_get_nth(in->same_name_prev_id) : NULL;
|
|
}
|
|
|
|
WSLUA_RETURN(items_found); /* All the values of this field */
|
|
}
|
|
|
|
WSLUA_METAMETHOD Field__tostring(lua_State* L) {
|
|
/* Obtain a string with the field name. */
|
|
Field f = checkField(L,1);
|
|
|
|
if (wanted_fields) {
|
|
lua_pushstring(L,*((gchar**)f));
|
|
} else {
|
|
lua_pushstring(L,(*f)->abbrev);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int Field__gc(lua_State* L _U_) {
|
|
/* do NOT free Field */
|
|
return 0;
|
|
}
|
|
|
|
WSLUA_METHODS Field_methods[] = {
|
|
WSLUA_CLASS_FNREG(Field,new),
|
|
WSLUA_CLASS_FNREG(Field,list),
|
|
{ NULL, NULL }
|
|
};
|
|
|
|
WSLUA_META Field_meta[] = {
|
|
WSLUA_CLASS_MTREG(Field,tostring),
|
|
WSLUA_CLASS_MTREG(Field,call),
|
|
{ NULL, NULL }
|
|
};
|
|
|
|
int Field_register(lua_State* L) {
|
|
|
|
wanted_fields = g_ptr_array_new();
|
|
|
|
WSLUA_REGISTER_CLASS(Field);
|
|
outstanding_FieldInfo = g_ptr_array_new();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|