7c4176d868
winapi_cleanup tool written by Patrik Stridvall for the wine project. svn path=/trunk/; revision=6117
130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/* packet-ieee8023.c
|
|
* Routine for dissecting 802.3 (as opposed to D/I/X Ethernet) packets.
|
|
*
|
|
* $Id: packet-ieee8023.c,v 1.4 2002/08/28 21:00:17 jmayer Exp $
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include <glib.h>
|
|
#include <epan/packet.h>
|
|
#include "packet-ieee8023.h"
|
|
|
|
static dissector_handle_t ipx_handle;
|
|
static dissector_handle_t llc_handle;
|
|
|
|
static void add_trailer(proto_tree *fh_tree, int trailer_id,
|
|
tvbuff_t *trailer_tvb);
|
|
|
|
void
|
|
dissect_802_3(int length, gboolean is_802_2, tvbuff_t *tvb,
|
|
int offset_after_length, packet_info *pinfo, proto_tree *tree,
|
|
proto_tree *fh_tree, int length_id, int trailer_id)
|
|
{
|
|
tvbuff_t *volatile next_tvb;
|
|
tvbuff_t *volatile trailer_tvb;
|
|
|
|
if (fh_tree)
|
|
proto_tree_add_uint(fh_tree, length_id, tvb, offset_after_length - 2, 2,
|
|
length);
|
|
|
|
/* Give the next dissector only 'length' number of bytes */
|
|
TRY {
|
|
next_tvb = tvb_new_subset(tvb, offset_after_length, length, length);
|
|
trailer_tvb = tvb_new_subset(tvb, offset_after_length + length, -1, -1);
|
|
}
|
|
CATCH2(BoundsError, ReportedBoundsError) {
|
|
/* Either:
|
|
|
|
the packet doesn't have "length" bytes worth of
|
|
captured data left in it - or it may not even have
|
|
"length" bytes worth of data in it, period -
|
|
so the "tvb_new_subset()" creating "next_tvb"
|
|
threw an exception
|
|
|
|
or
|
|
|
|
the packet has exactly "length" bytes worth of
|
|
captured data left in it, so the "tvb_new_subset()"
|
|
creating "trailer_tvb" threw an exception.
|
|
|
|
In either case, this means that all the data in the frame
|
|
is within the length value, so we give all the data to the
|
|
next protocol and have no trailer. */
|
|
next_tvb = tvb_new_subset(tvb, offset_after_length, -1, length);
|
|
trailer_tvb = NULL;
|
|
}
|
|
ENDTRY;
|
|
|
|
/* Dissect the payload either as IPX or as an LLC frame.
|
|
Catch BoundsError and ReportedBoundsError, so that if the
|
|
reported length of "next_tvb" was reduced by some dissector
|
|
before an exception was thrown, we can still put in an item
|
|
for the trailer. */
|
|
TRY {
|
|
if (is_802_2)
|
|
call_dissector(llc_handle, next_tvb, pinfo, tree);
|
|
else
|
|
call_dissector(ipx_handle, next_tvb, pinfo, tree);
|
|
}
|
|
CATCH2(BoundsError, ReportedBoundsError) {
|
|
/* Well, somebody threw an exception. Add the trailer, if appropriate. */
|
|
add_trailer(fh_tree, trailer_id, trailer_tvb);
|
|
|
|
/* Rethrow the exception, so the "Short Frame" or "Mangled Frame"
|
|
indication can be put into the tree. */
|
|
RETHROW;
|
|
|
|
/* XXX - RETHROW shouldn't return. */
|
|
g_assert_not_reached();
|
|
}
|
|
ENDTRY;
|
|
|
|
add_trailer(fh_tree, trailer_id, trailer_tvb);
|
|
}
|
|
|
|
static void
|
|
add_trailer(proto_tree *fh_tree, int trailer_id, tvbuff_t *trailer_tvb)
|
|
{
|
|
/* If there's some bytes left over, mark them. */
|
|
if (trailer_tvb && fh_tree) {
|
|
guint trailer_length;
|
|
|
|
trailer_length = tvb_length(trailer_tvb);
|
|
if (trailer_length != 0) {
|
|
proto_tree_add_item(fh_tree, trailer_id, trailer_tvb, 0,
|
|
trailer_length, FALSE);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_ieee802_3(void)
|
|
{
|
|
/*
|
|
* Get handles for the IPX and LLC dissectors.
|
|
*/
|
|
ipx_handle = find_dissector("ipx");
|
|
llc_handle = find_dissector("llc");
|
|
}
|