2000-10-19 06:45:11 +00:00
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/* packet-tpkt.h
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*
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* Routines for TPKT dissection
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*
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* Copyright 2000, Philips Electronics N.V.
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* Andreas Sikkema <andreas.sikkema@philips.com>
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*
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2002-02-22 08:56:48 +00:00
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* $Id: packet-tpkt.h,v 1.6 2002/02/22 08:56:46 guy Exp $
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2001-06-12 06:32:39 +00:00
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*
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2000-10-19 06:45:11 +00:00
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* Ethereal - Network traffic analyzer
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2001-06-12 06:32:39 +00:00
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* By Gerald Combs <gerald@ethereal.com>
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2000-10-19 06:45:11 +00:00
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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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2001-03-28 07:49:41 +00:00
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/*
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* Check whether this could be a TPKT-encapsulated PDU.
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Clean up the heuristic code in the Q.931 dissector. If it's a heuristic
dissector, it's looking for Q.931 encapsulated inside TPKT, so it
shouldn't check whether the first byte is NLPID_Q_931 or not, as it
*won't* be NLPID_Q_931, it'll be 3, for the TPKT version. It should
first check whether "is_tpkt()" thinks it's a TPKT packet, and then
check that the packet has at least 3 bytes past the TPKT header, then
check the first byte in the payload to see whether it's NLPID_Q_931. If
that all succeeds, treat it as Q.931 inside TPKT.
Make "is_tpkt()" return the length from the TPKT header on success, and
-1 on failure, and return the offset past the TPKT header via a pointer
(so clients don't have to know that the TPKT header is 4 bytes long).
svn path=/trunk/; revision=4669
2002-02-02 02:51:20 +00:00
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* Returns -1 if it's not.
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* Sets "*offset" to the offset of the first byte past the TPKT header,
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* and returns the length from the TPKT header, if it is.
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2001-03-28 07:49:41 +00:00
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*/
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2002-02-22 08:56:48 +00:00
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extern int is_tpkt(tvbuff_t *tvb, int *offset);
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2001-03-28 07:49:41 +00:00
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/*
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2002-02-22 08:56:48 +00:00
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* Dissect TPKT-encapsulated data in a TCP stream.
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2001-03-28 07:49:41 +00:00
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*/
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2002-02-22 08:56:48 +00:00
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extern void dissect_tpkt_encap(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree, gboolean desegment,
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dissector_handle_t subdissector_handle);
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