76729e5d0f
Fix compilation failures when building wireshark-0.99.6-SVN-21916 on an x86_64-unknown-linux-gnu target with gcc version 4.1.2 20070403 (Red Hat 4.1.2-8). The failures fall into two categories: (1) Casts between pointers and 32-bit integers without an intermediary cast via 'long' or 'unsigned long'. This results in a compiler warning complaining about casts between a pointer and an integer of a different size. (2) Passing values to "%lld" or similar printf-style format options that the compiler thinks are a different size. Such values need to be cast to 'long long' or 'unsigned long long'. svn path=/trunk/; revision=21975
1585 lines
55 KiB
C
1585 lines
55 KiB
C
/* packet-h223.c
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* Routines for H.223 packet dissection
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* Copyright (c) 2004-5 MX Telecom Ltd <richardv@mxtelecom.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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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <gmodule.h>
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#include <glib.h>
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#include <epan/emem.h>
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#include <epan/bitswap.h>
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#include <epan/circuit.h>
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#include <epan/conversation.h>
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#include <epan/packet.h>
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#include <epan/stream.h>
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#include <epan/reassemble.h>
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#include <epan/iax2_codec_type.h>
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#include <epan/dissectors/packet-frame.h>
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#include <epan/asn1.h>
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#include <epan/dissectors/packet-h245.h>
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#include "packet-h223.h"
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#include "golay.h"
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#include <string.h>
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/* #define DEBUG_H223 */
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/* debug the mux-pdu defragmentation code. warning: verbose output! */
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/* #define DEBUG_H223_FRAGMENTATION */
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#define PROTO_TAG_H223 "H223"
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/* Wireshark ID of the H.223 protocol */
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static int proto_h223 = -1;
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static int proto_h223_bitswapped = -1;
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/* The following hf_* variables are used to hold the Wireshark IDs of
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* our header fields; they are filled out when we call
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* proto_register_field_array() in proto_register_h223()
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*/
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static int hf_h223_non_h223_data = -1;
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static int hf_h223_mux_stuffing_pdu = -1;
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static int hf_h223_mux_pdu = -1;
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static int hf_h223_mux_header = -1;
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static int hf_h223_mux_rawhdr = -1;
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static int hf_h223_mux_correctedhdr = -1;
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static int hf_h223_mux_mc = -1;
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static int hf_h223_mux_mpl = -1;
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static int hf_h223_mux_deact = -1;
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static int hf_h223_mux_vc = -1;
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static int hf_h223_mux_extra = -1;
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static int hf_h223_mux_hdlc2 = -1;
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static int hf_h223_mux_fragments = -1;
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static int hf_h223_mux_fragment = -1;
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static int hf_h223_mux_fragment_overlap = -1;
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static int hf_h223_mux_fragment_overlap_conflict = -1;
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static int hf_h223_mux_fragment_multiple_tails = -1;
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static int hf_h223_mux_fragment_too_long_fragment = -1;
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static int hf_h223_mux_fragment_error = -1;
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static int hf_h223_mux_reassembled_in = -1;
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static int hf_h223_al_fragments = -1;
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static int hf_h223_al_fragment = -1;
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static int hf_h223_al_fragment_overlap = -1;
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static int hf_h223_al_fragment_overlap_conflict = -1;
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static int hf_h223_al_fragment_multiple_tails = -1;
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static int hf_h223_al_fragment_too_long_fragment = -1;
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static int hf_h223_al_fragment_error = -1;
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static int hf_h223_al_reassembled_in = -1;
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static int hf_h223_al1 = -1;
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static int hf_h223_al1_framed = -1;
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static int hf_h223_al2 = -1;
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static int hf_h223_al2_sequenced = -1;
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static int hf_h223_al2_unsequenced = -1;
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static int hf_h223_al2_seqno = -1;
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static int hf_h223_al2_crc = -1;
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static int hf_h223_al2_crc_bad = -1;
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static int hf_h223_al_payload = -1;
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/* These are the ids of the subtrees that we may be creating */
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static gint ett_h223 = -1;
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static gint ett_h223_non_h223_data = -1;
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static gint ett_h223_mux_stuffing_pdu = -1;
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static gint ett_h223_mux_pdu = -1;
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static gint ett_h223_mux_header = -1;
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static gint ett_h223_mux_deact = -1;
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static gint ett_h223_mux_vc = -1;
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static gint ett_h223_mux_extra = -1;
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static gint ett_h223_mux_fragments = -1;
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static gint ett_h223_mux_fragment = -1;
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static gint ett_h223_al_fragments = -1;
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static gint ett_h223_al_fragment = -1;
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static gint ett_h223_al1 = -1;
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static gint ett_h223_al2 = -1;
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static gint ett_h223_al_payload = -1;
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/* These are the handles of our subdissectors */
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static dissector_handle_t data_handle=NULL;
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static dissector_handle_t srp_handle=NULL;
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static dissector_handle_t h245dg_handle=NULL;
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static const fragment_items h223_mux_frag_items _U_ = {
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&ett_h223_mux_fragment,
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&ett_h223_mux_fragments,
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&hf_h223_mux_fragments,
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&hf_h223_mux_fragment,
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&hf_h223_mux_fragment_overlap,
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&hf_h223_mux_fragment_overlap_conflict,
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&hf_h223_mux_fragment_multiple_tails,
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&hf_h223_mux_fragment_too_long_fragment,
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&hf_h223_mux_fragment_error,
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&hf_h223_mux_reassembled_in,
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"fragments"
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};
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static const fragment_items h223_al_frag_items = {
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&ett_h223_al_fragment,
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&ett_h223_al_fragments,
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&hf_h223_al_fragments,
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&hf_h223_al_fragment,
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&hf_h223_al_fragment_overlap,
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&hf_h223_al_fragment_overlap_conflict,
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&hf_h223_al_fragment_multiple_tails,
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&hf_h223_al_fragment_too_long_fragment,
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&hf_h223_al_fragment_error,
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&hf_h223_al_reassembled_in,
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"fragments"
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};
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/* this is a fudge to pass pdu_offset into add_h223_mux_element() */
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static guint32 pdu_offset;
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/***************************************************************************
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*
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* virtual circuit number handling
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*
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* we have to be able to manage more than one H.223 call at a time,
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* so have a hash which maps {call,vc} to an integer.
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*/
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typedef struct _h223_call_info h223_call_info;
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typedef struct {
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const h223_call_info* call; /* h223 call */
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guint32 vc; /* child circuit */
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} circuit_chain_key;
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static GHashTable *circuit_chain_hashtable = NULL;
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static guint circuit_chain_count = 1;
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/* Hash Functions */
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static gint circuit_chain_equal(gconstpointer v, gconstpointer w)
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{
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const circuit_chain_key *v1 = (const circuit_chain_key *)v;
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const circuit_chain_key *v2 = (const circuit_chain_key *)w;
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gint result;
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result = ( v1->call == v2->call &&
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v1->vc == v2 -> vc );
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return result;;
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}
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static guint circuit_chain_hash (gconstpointer v)
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{
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const circuit_chain_key *key = (const circuit_chain_key *)v;
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guint hash_val = ((guint32)(unsigned long)(key->call))^(((guint32)key->vc) << 16);
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return hash_val;
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}
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static guint32 circuit_chain_lookup(const h223_call_info* call_info,
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guint32 child_vc)
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{
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circuit_chain_key key, *new_key;
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guint32 circuit_id;
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key.call = call_info;
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key.vc = child_vc;
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circuit_id = GPOINTER_TO_UINT(g_hash_table_lookup( circuit_chain_hashtable, &key ));
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if( circuit_id == 0 ) {
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new_key = se_alloc(sizeof(circuit_chain_key));
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*new_key = key;
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circuit_id = ++circuit_chain_count;
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g_hash_table_insert(circuit_chain_hashtable, new_key, GUINT_TO_POINTER(circuit_id));
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}
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return circuit_id;
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}
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static void circuit_chain_init(void)
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{
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if (circuit_chain_hashtable)
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g_hash_table_destroy(circuit_chain_hashtable);
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circuit_chain_hashtable = g_hash_table_new(circuit_chain_hash, circuit_chain_equal);
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circuit_chain_count = 1;
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}
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/***************************************************************************
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*
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* Call information management
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*
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*/
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/* we keep information on each call in an h223_call_info structure
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*
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* We attach the h223_call_info structures to individual calls with
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* circuit_add_proto_data().
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*/
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typedef struct _h223_mux_element_listitem h223_mux_element_listitem;
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struct _h223_mux_element_listitem {
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h223_mux_element *me;
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guint32 first_frame;
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guint32 pdu_offset;
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h223_mux_element_listitem *next;
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};
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/* we have this information for each stream */
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typedef struct {
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h223_mux_element_listitem* mux_table[16];
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} h223_call_direction_data;
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struct _h223_call_info {
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/* H.223 level: 0 for standard H223, 1, 2 or 3 for the enhanced protocols
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specified in the annexes
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*/
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int h223_level;
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/* for H.223 streams over TCP (as opposed to IAX), this
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stores the source address and port of the first packet spotted,
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so that we can differentiate directions.
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*/
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address srcaddress;
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guint32 srcport;
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h223_call_direction_data direction_data[2];
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};
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typedef struct _h223_lc_params_listitem h223_lc_params_listitem;
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struct _h223_lc_params_listitem
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{
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h223_lc_params *lc_params;
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guint32 first_frame;
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guint32 last_frame;
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h223_lc_params_listitem *next;
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};
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typedef struct {
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h223_lc_params_listitem *lc_params[2];
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h223_call_info *call_info;
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} h223_vc_info;
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static void add_h223_mux_element(h223_call_direction_data *direct, guint8 mc, h223_mux_element *me, guint32 framenum)
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{
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h223_mux_element_listitem *li;
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h223_mux_element_listitem **old_li_ptr;
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h223_mux_element_listitem *old_li;
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DISSECTOR_ASSERT(mc < 16);
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li = se_alloc(sizeof(h223_mux_element_listitem));
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old_li_ptr = &(direct->mux_table[mc]);
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old_li = *old_li_ptr;
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if( !old_li ) {
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direct->mux_table[mc] = li;
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} else {
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while( old_li->next ) {
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old_li_ptr = &(old_li->next);
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old_li = *old_li_ptr;
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}
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if( framenum < old_li->first_frame || (framenum == old_li->first_frame && pdu_offset < old_li->pdu_offset) )
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return;
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else if ( framenum == old_li->first_frame && pdu_offset == old_li->pdu_offset )
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*old_li_ptr = li; /* replace the tail of the list with the new item, since */
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/* a single h223 pdu has just set the same MC twice.. */
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else
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old_li->next = li;
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}
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li->first_frame = framenum;
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li->pdu_offset = pdu_offset;
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li->next = 0;
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li->me = me;
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}
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static h223_mux_element* find_h223_mux_element(h223_call_direction_data* direct, guint8 mc, guint32 framenum, guint32 pkt_offset)
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{
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h223_mux_element_listitem* li;
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DISSECTOR_ASSERT(mc < 16);
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li = direct->mux_table[mc];
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while( li && li->next && li->next->first_frame < framenum )
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li = li->next;
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while( li && li->next && li->next->first_frame == framenum && li->next->pdu_offset < pkt_offset )
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li = li->next;
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if( li ) {
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return li->me;
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} else {
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return NULL;
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}
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}
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static void add_h223_lc_params(h223_vc_info* vc_info, int direction, h223_lc_params *lc_params, guint32 framenum )
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{
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h223_lc_params_listitem *li = se_alloc(sizeof(h223_lc_params_listitem));
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h223_lc_params_listitem **old_li_ptr = &(vc_info->lc_params[direction ? 0 : 1]);
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h223_lc_params_listitem *old_li = *old_li_ptr;
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if( !old_li ) {
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vc_info->lc_params[direction ? 0 : 1] = li;
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} else {
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while( old_li->next ) {
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old_li_ptr = &(old_li->next);
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old_li = *old_li_ptr;
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}
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if( framenum < old_li->first_frame )
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return;
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else if( framenum == old_li->first_frame )
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*old_li_ptr = li;
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else {
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old_li->next = li;
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old_li->last_frame = framenum - 1;
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}
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}
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li->first_frame = framenum;
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li->last_frame = 0;
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li->next = 0;
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li->lc_params = lc_params;
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}
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static h223_lc_params* find_h223_lc_params(h223_vc_info* vc_info, int direction, guint32 framenum)
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{
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h223_lc_params_listitem* li = vc_info->lc_params[direction? 0 : 1];
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while( li && li->next && li->next->first_frame <= framenum )
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li = li->next;
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if( li )
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return li->lc_params;
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else
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return NULL;
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}
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static void init_direction_data(h223_call_direction_data *direct)
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{
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int i;
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h223_mux_element *mc0_element;
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for ( i = 0; i < 16; ++i )
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direct->mux_table[i] = NULL;
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/* set up MC 0 to contain just VC 0 */
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mc0_element = se_alloc(sizeof(h223_mux_element));
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add_h223_mux_element( direct, 0, mc0_element, 0 );
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mc0_element->sublist = NULL;
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mc0_element->vc = 0;
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mc0_element->repeat_count = 0; /* until closing flag */
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mc0_element->next = NULL;
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}
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static h223_vc_info* h223_vc_info_new( h223_call_info* call_info )
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{
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h223_vc_info *vc_info = se_alloc(sizeof(h223_vc_info));
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vc_info->lc_params[0] = vc_info->lc_params[1] = NULL;
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vc_info->call_info = call_info;
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return vc_info;
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}
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static void init_logical_channel( guint32 start_frame, h223_call_info* call_info, int vc, int direction, h223_lc_params* params )
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{
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guint32 circuit_id = circuit_chain_lookup(call_info, vc);
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circuit_t *subcircuit;
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h223_vc_info *vc_info;
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subcircuit = find_circuit( CT_H223, circuit_id, start_frame );
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if( subcircuit == NULL ) {
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subcircuit = circuit_new( CT_H223, circuit_id, start_frame );
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#ifdef DEBUG_H223
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g_debug("%d: Created new circuit %d for call %p VC %d", start_frame, circuit_id, call_info, vc);
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#endif
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vc_info = h223_vc_info_new( call_info );
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circuit_add_proto_data( subcircuit, proto_h223, vc_info );
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} else {
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vc_info = circuit_get_proto_data( subcircuit, proto_h223 );
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}
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add_h223_lc_params( vc_info, direction, params, start_frame );
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}
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/* create a brand-new h223_call_info structure */
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static h223_call_info *create_call_info( guint32 start_frame )
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{
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h223_call_info *data;
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h223_lc_params *vc0_params;
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data = se_alloc(sizeof(h223_call_info));
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/* initialise the call info */
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init_direction_data(&data -> direction_data[0]);
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init_direction_data(&data -> direction_data[1]);
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/* FIXME shouldn't this be figured out dynamically? */
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data -> h223_level = 2;
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vc0_params = se_alloc(sizeof(h223_lc_params));
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vc0_params->al_type = al1Framed;
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vc0_params->al_params = NULL;
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vc0_params->segmentable = TRUE;
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vc0_params->subdissector = srp_handle;
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init_logical_channel( start_frame, data, 0, P2P_DIR_SENT, vc0_params );
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init_logical_channel( start_frame, data, 0, P2P_DIR_RECV, vc0_params );
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return data;
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}
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/* find or create call_info struct for calls over circuits (eg, IAX) */
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static h223_call_info *find_or_create_call_info_circ(packet_info * pinfo)
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{
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h223_call_info *data;
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circuit_t *circ = NULL;
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if(pinfo->ctype != CT_NONE)
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circ = find_circuit( pinfo->ctype, pinfo->circuit_id, pinfo->fd->num );
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if(circ == NULL)
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return NULL;
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|
|
data = (h223_call_info *)circuit_get_proto_data(circ, proto_h223);
|
|
|
|
if( data == NULL ) {
|
|
data = create_call_info(pinfo->fd->num);
|
|
|
|
#ifdef DEBUG_H223
|
|
g_debug("%u: Created new call %p for circuit %p ctype %d, id %u",
|
|
pinfo->fd->num, data, circ, pinfo->ctype, pinfo->circuit_id);
|
|
#endif
|
|
circuit_add_proto_data(circ, proto_h223, data);
|
|
}
|
|
|
|
/* work out what direction we're really going in */
|
|
if( pinfo->p2p_dir < 0 || pinfo->p2p_dir > 1)
|
|
pinfo->p2p_dir = P2P_DIR_SENT;
|
|
|
|
return data;
|
|
}
|
|
|
|
/* find or create call_info struct for calls over conversations (eg, RTP) */
|
|
static h223_call_info *find_or_create_call_info_conv(packet_info * pinfo)
|
|
{
|
|
h223_call_info *data;
|
|
conversation_t *conv;
|
|
|
|
/* assume we're running atop TCP or RTP; use the conversation support */
|
|
conv = find_conversation( pinfo->fd->num,
|
|
&pinfo->src,&pinfo->dst,
|
|
pinfo->ptype,
|
|
pinfo->srcport,pinfo->destport, 0 );
|
|
|
|
/* both RTP and TCP track their conversations, so just assert here if
|
|
* we can't find one */
|
|
DISSECTOR_ASSERT(conv);
|
|
|
|
data = (h223_call_info *)conversation_get_proto_data(conv, proto_h223);
|
|
|
|
if(data == NULL && pinfo->ptype == PT_UDP ) {
|
|
conversation_t *conv2;
|
|
|
|
/* RTP tracks the two sides of the conversation totally separately;
|
|
* this messes us up totally.
|
|
*
|
|
* Look for another converstation, going in the opposite direction.
|
|
*/
|
|
conv2 = find_conversation( pinfo->fd->num,
|
|
&pinfo->dst,&pinfo->src,
|
|
pinfo->ptype,
|
|
pinfo->destport,pinfo->srcport, 0 );
|
|
if(conv2 != NULL)
|
|
data = (h223_call_info *)conversation_get_proto_data(conv2, proto_h223);
|
|
|
|
if(data != NULL) {
|
|
#ifdef DEBUG_H223
|
|
g_debug("%u: Identified conv %p as reverse of conv %p with call %p and type=%u src=%u.%u.%u.%u:%u dst=%u.%u.%u.%u:%u",
|
|
pinfo->fd->num, conv, conv2, data, pinfo->ptype,
|
|
pinfo->dst.data[0], pinfo->dst.data[1], pinfo->dst.data[2], pinfo->dst.data[3],
|
|
pinfo->destport,
|
|
pinfo->src.data[0], pinfo->src.data[1], pinfo->src.data[2], pinfo->src.data[3],
|
|
pinfo->srcport);
|
|
#endif
|
|
conversation_add_proto_data(conv, proto_h223, data);
|
|
}
|
|
}
|
|
|
|
/* we still haven't found any call data - create a new one for this
|
|
* conversation */
|
|
if(data == NULL) {
|
|
data = create_call_info(pinfo->fd->num);
|
|
|
|
#ifdef DEBUG_H223
|
|
g_debug("%u: Created new call %p for conv %p type=%u src=%u.%u.%u.%u:%u dst=%u.%u.%u.%u:%u",
|
|
pinfo->fd->num, data, conv, pinfo->ptype,
|
|
pinfo->src.data[0], pinfo->src.data[1], pinfo->src.data[2], pinfo->src.data[3],
|
|
pinfo->srcport,
|
|
pinfo->dst.data[0], pinfo->dst.data[1], pinfo->dst.data[2], pinfo->dst.data[3],
|
|
pinfo->destport);
|
|
#endif
|
|
|
|
conversation_add_proto_data(conv, proto_h223, data);
|
|
/* add the source details so we can distinguish directions
|
|
* in future */
|
|
COPY_ADDRESS(&(data -> srcaddress), &(pinfo->src));
|
|
data -> srcport = pinfo->srcport;
|
|
}
|
|
|
|
/* work out what direction we're really going in */
|
|
if( ADDRESSES_EQUAL( &(pinfo->src), &(data->srcaddress))
|
|
&& pinfo->srcport == data->srcport )
|
|
pinfo->p2p_dir = P2P_DIR_SENT;
|
|
else
|
|
pinfo->p2p_dir = P2P_DIR_RECV;
|
|
|
|
return data;
|
|
}
|
|
|
|
static h223_call_info *find_or_create_call_info ( packet_info * pinfo )
|
|
{
|
|
h223_call_info *data;
|
|
|
|
data = find_or_create_call_info_circ(pinfo);
|
|
if(data == NULL)
|
|
data = find_or_create_call_info_conv(pinfo);
|
|
return data;
|
|
}
|
|
|
|
/* called from the h245 dissector to handle a MultiplexEntrySend message */
|
|
static void h223_set_mc( packet_info* pinfo, guint8 mc, h223_mux_element* me )
|
|
{
|
|
circuit_t *circ = find_circuit( pinfo->ctype, pinfo->circuit_id, pinfo->fd->num );
|
|
h223_vc_info* vc_info;
|
|
|
|
/* if this h245 pdu packet came from an h223 circuit, add the details on
|
|
* the new mux entry */
|
|
if(circ) {
|
|
vc_info = circuit_get_proto_data(circ, proto_h223);
|
|
add_h223_mux_element( &(vc_info->call_info->direction_data[pinfo->p2p_dir ? 0 : 1]), mc, me, pinfo->fd->num );
|
|
}
|
|
}
|
|
|
|
/* called from the h245 dissector to handle an OpenLogicalChannelAck message */
|
|
static void h223_add_lc( packet_info* pinfo, guint16 lc, h223_lc_params* params )
|
|
{
|
|
circuit_t *circ = find_circuit( pinfo->ctype, pinfo->circuit_id, pinfo->fd->num );
|
|
h223_vc_info* vc_info;
|
|
|
|
/* if this h245 pdu packet came from an h223 circuit, add the details on
|
|
* the new channel */
|
|
if(circ) {
|
|
vc_info = circuit_get_proto_data(circ, proto_h223);
|
|
init_logical_channel( pinfo->fd->num, vc_info->call_info, lc, pinfo->p2p_dir, params );
|
|
}
|
|
}
|
|
|
|
/************************************************************************************
|
|
*
|
|
* AL-PDU dissection
|
|
*/
|
|
|
|
const guint8 crctable[256] = {
|
|
0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75, 0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b,
|
|
0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69, 0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67,
|
|
0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d, 0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43,
|
|
0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51, 0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f,
|
|
0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05, 0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b,
|
|
0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19, 0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17,
|
|
0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d, 0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33,
|
|
0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21, 0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f,
|
|
0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95, 0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b,
|
|
0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89, 0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87,
|
|
0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad, 0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3,
|
|
0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1, 0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf,
|
|
0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5, 0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb,
|
|
0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9, 0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7,
|
|
0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd, 0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3,
|
|
0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1, 0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf };
|
|
|
|
static guint8 h223_al2_crc8bit( tvbuff_t *tvb ) {
|
|
guint32 len = tvb_reported_length(tvb) - 1;
|
|
const guint8* data = tvb_get_ptr( tvb, 0, len );
|
|
unsigned char crc = 0;
|
|
guint32 pos = 0;
|
|
DISSECTOR_ASSERT(tvb_reported_length(tvb) >= 1);
|
|
while ( len-- )
|
|
crc = crctable[crc^data[pos++]];
|
|
return crc;
|
|
}
|
|
|
|
static void dissect_mux_al_pdu( tvbuff_t *tvb,
|
|
packet_info *pinfo,
|
|
proto_tree *vc_tree,
|
|
/* circuit_t* vc_circuit, */
|
|
h223_lc_params* lc_params )
|
|
{
|
|
proto_tree *al_tree = NULL;
|
|
proto_item *al_item;
|
|
proto_tree *al_subtree;
|
|
proto_item *al_subitem = NULL;
|
|
proto_item *tmp_item;
|
|
tvbuff_t *next_tvb = NULL;
|
|
dissector_handle_t subdissector = lc_params->subdissector;
|
|
guint32 len = tvb_reported_length(tvb);
|
|
|
|
guint8 calc_checksum;
|
|
guint8 real_checksum;
|
|
gboolean al2_sequenced = FALSE;
|
|
int data_start;
|
|
|
|
switch( lc_params->al_type ) {
|
|
case al1Framed:
|
|
case al1NotFramed:
|
|
al_item = proto_tree_add_none_format(vc_tree, hf_h223_al1, tvb, 0, -1, "H.223 AL1 (%sframed)",
|
|
(lc_params->al_type==al1Framed)?"":"not ");
|
|
al_tree = proto_item_add_subtree (al_item, ett_h223_al1);
|
|
if(lc_params->al_type == al1Framed)
|
|
proto_tree_add_boolean_hidden(al_tree, hf_h223_al1_framed, tvb, 0, 1, TRUE );
|
|
next_tvb = tvb;
|
|
al_subitem = proto_tree_add_item(al_tree, hf_h223_al_payload, next_tvb, 0, -1, FALSE);
|
|
break;
|
|
|
|
case al2WithSequenceNumbers:
|
|
al2_sequenced = TRUE;
|
|
/* fall-through */
|
|
case al2WithoutSequenceNumbers:
|
|
tmp_item = proto_tree_add_boolean(vc_tree, hf_h223_al2, tvb, 0, 0, TRUE );
|
|
|
|
al_item = proto_tree_add_item(vc_tree,
|
|
al2_sequenced?hf_h223_al2_sequenced:hf_h223_al2_unsequenced,
|
|
tvb, 0, -1,FALSE);
|
|
al_tree = proto_item_add_subtree (al_item, ett_h223_al2);
|
|
|
|
PROTO_ITEM_SET_GENERATED(tmp_item);
|
|
|
|
/* check minimum payload length */
|
|
if(len < (al2_sequenced?2U:1U))
|
|
THROW(BoundsError);
|
|
|
|
data_start = 0;
|
|
if( al2_sequenced ) {
|
|
proto_tree_add_item(al_tree, hf_h223_al2_seqno, tvb, 0, 1, TRUE);
|
|
data_start++;
|
|
}
|
|
|
|
next_tvb = tvb_new_subset( tvb, data_start, len-1-data_start, len-1-data_start );
|
|
al_subitem = proto_tree_add_item(al_tree, hf_h223_al_payload, next_tvb, 0, -1, FALSE);
|
|
|
|
calc_checksum = h223_al2_crc8bit(tvb);
|
|
real_checksum = tvb_get_guint8(tvb, len - 1);
|
|
|
|
if( calc_checksum == real_checksum ) {
|
|
proto_tree_add_uint_format(al_tree, hf_h223_al2_crc, tvb, len - 1, 1, real_checksum,
|
|
"CRC: 0x%02x (correct)", real_checksum );
|
|
} else {
|
|
proto_tree_add_uint_format(al_tree, hf_h223_al2_crc, tvb, len - 1, 1, real_checksum,
|
|
"CRC: 0x%02x (incorrect, should be 0x%02x)", real_checksum, calc_checksum );
|
|
tmp_item = proto_tree_add_boolean( al_tree, hf_h223_al2_crc_bad, tvb, len - 1, 1, TRUE );
|
|
PROTO_ITEM_SET_GENERATED(tmp_item);
|
|
|
|
/* don't pass pdus which fail checksums on to the subdissector */
|
|
subdissector = data_handle;
|
|
}
|
|
break;
|
|
default:
|
|
call_dissector(data_handle, tvb, pinfo, vc_tree);
|
|
return;
|
|
}
|
|
|
|
if (!subdissector)
|
|
subdissector = data_handle;
|
|
|
|
al_subtree = proto_item_add_subtree(al_subitem, ett_h223_al_payload);
|
|
call_dissector(subdissector, next_tvb, pinfo, al_subtree);
|
|
}
|
|
|
|
/************************************************************************************
|
|
*
|
|
* MUX-PDU dissection
|
|
*/
|
|
|
|
|
|
/* dissect a fragment of a MUX-PDU which belongs to a particular VC
|
|
*
|
|
* tvb buffer containing the MUX-PDU fragment
|
|
* pinfo info on the packet containing the last fragment of the MUX-PDU
|
|
* pkt_offset offset within the block from the superdissector where the
|
|
* fragment starts (must increase monotonically for constant pinfo->fd->num)
|
|
* pdu_tree dissection tree for the PDU; a single item will be added (with
|
|
* its own subtree)
|
|
* vc VC for this SDU
|
|
* end_of_mux_sdu true if this is a segmentable VC and this is the last
|
|
* fragment in an SDU
|
|
*/
|
|
static void dissect_mux_sdu_fragment(tvbuff_t *volatile next_tvb,
|
|
packet_info *pinfo,
|
|
guint32 pkt_offset,
|
|
proto_tree *pdu_tree,
|
|
h223_call_info* call_info,
|
|
guint16 vc, gboolean end_of_mux_sdu)
|
|
{
|
|
/* update the circuit details before passing to a subdissector */
|
|
guint32 orig_circuit = pinfo->circuit_id;
|
|
guint32 orig_ctype = pinfo->ctype;
|
|
pinfo->circuit_id=circuit_chain_lookup(call_info, vc);
|
|
pinfo->ctype=CT_H223;
|
|
|
|
TRY {
|
|
circuit_t *subcircuit=find_circuit(pinfo->ctype,pinfo->circuit_id,pinfo->fd->num);
|
|
proto_tree *vc_tree = NULL;
|
|
proto_item *vc_item;
|
|
h223_vc_info *vc_info = NULL;
|
|
h223_lc_params *lc_params = NULL;
|
|
|
|
if(pdu_tree) {
|
|
vc_item = proto_tree_add_uint(pdu_tree, hf_h223_mux_vc, next_tvb, 0, tvb_reported_length(next_tvb), vc);
|
|
vc_tree = proto_item_add_subtree (vc_item, ett_h223_mux_vc);
|
|
}
|
|
|
|
if( subcircuit == NULL ) {
|
|
g_message( "Frame %d: Subcircuit id %d not found for call %p VC %d", pinfo->fd->num,
|
|
pinfo->circuit_id, call_info, vc );
|
|
} else {
|
|
vc_info = circuit_get_proto_data(subcircuit, proto_h223);
|
|
if( vc_info != NULL ) {
|
|
lc_params = find_h223_lc_params( vc_info, pinfo->p2p_dir, pinfo->fd->num );
|
|
}
|
|
}
|
|
|
|
|
|
if( lc_params != NULL ) {
|
|
if( lc_params->segmentable && lc_params->al_type != al1NotFramed ) {
|
|
stream_t *substream;
|
|
stream_pdu_fragment_t *frag;
|
|
|
|
substream = find_stream_circ(subcircuit,pinfo->p2p_dir);
|
|
if(substream == NULL )
|
|
substream = stream_new_circ(subcircuit,pinfo->p2p_dir);
|
|
frag = stream_find_frag(substream,pinfo->fd->num,pkt_offset);
|
|
|
|
if(frag == NULL ) {
|
|
#ifdef DEBUG_H223
|
|
g_debug("%d: New H.223 VC fragment: Parent circuit %d; subcircuit %d; offset %d; len %d, end %d",
|
|
pinfo->fd->num, orig_circuit, pinfo->circuit_id, pkt_offset, tvb_reported_length(next_tvb), end_of_mux_sdu);
|
|
#endif
|
|
frag = stream_add_frag(substream,pinfo->fd->num,pkt_offset,
|
|
next_tvb,pinfo,!end_of_mux_sdu);
|
|
} else {
|
|
#ifdef DEBUG_H223
|
|
g_debug("%d: Found H.223 VC fragment: Parent circuit %d; subcircuit %d; offset %d; len %d, end %d",
|
|
pinfo->fd->num, orig_circuit, pinfo->circuit_id, pkt_offset, tvb_reported_length(next_tvb), end_of_mux_sdu);
|
|
#endif
|
|
}
|
|
|
|
next_tvb = stream_process_reassembled(
|
|
next_tvb, 0, pinfo,
|
|
"Reassembled H.223 AL-PDU",
|
|
frag, &h223_al_frag_items,
|
|
NULL, vc_tree);
|
|
}
|
|
|
|
if(next_tvb) {
|
|
/* fudge to pass pkt_offset down to add_h223_mux_element,
|
|
* should it be called */
|
|
pdu_offset = pkt_offset;
|
|
dissect_mux_al_pdu(next_tvb, pinfo, vc_tree,/* subcircuit,*/ lc_params );
|
|
}
|
|
} else {
|
|
call_dissector(data_handle,next_tvb,pinfo,vc_tree);
|
|
}
|
|
}
|
|
|
|
/* restore the original circuit details for future PDUs */
|
|
FINALLY {
|
|
pinfo->ctype=orig_ctype;
|
|
pinfo->circuit_id=orig_circuit;
|
|
}
|
|
ENDTRY;
|
|
}
|
|
|
|
static guint32 mux_element_sublist_size( h223_mux_element* me )
|
|
{
|
|
h223_mux_element *current_me = me;
|
|
guint32 length = 0;
|
|
while ( current_me ) {
|
|
current_me = current_me->next;
|
|
if ( current_me->sublist )
|
|
length += current_me->repeat_count * mux_element_sublist_size( current_me->sublist );
|
|
else
|
|
length += current_me->repeat_count;
|
|
}
|
|
if ( length == 0 ) { /* should never happen, but to avoid infinite loops... */
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
length = 1;
|
|
}
|
|
return length;
|
|
}
|
|
|
|
/* dissect part of a MUX-PDU payload according to a multiplex list
|
|
*
|
|
* tvb buffer containing entire mux-pdu payload
|
|
* pinfo info on the packet containing the last fragment of the MUX-PDU
|
|
* pkt_offset offset within the block from the superdissector where the
|
|
* MUX-PDU starts (must increase monotonically for constant
|
|
* pinfo->fd->num)
|
|
* pdu_tree dissection tree for the PDU
|
|
* call_info data structure for h223 call
|
|
* me top of mux list
|
|
* offset offset within tvb to start work
|
|
* endOfMuxSdu true if the end-of-sdu flag was set
|
|
*/
|
|
static guint32 dissect_mux_payload_by_me_list( tvbuff_t *tvb, packet_info *pinfo, guint32 pkt_offset,
|
|
proto_tree *pdu_tree,
|
|
h223_call_info* call_info, h223_mux_element* me, guint32 offset, gboolean endOfMuxSdu )
|
|
{
|
|
guint32 len = tvb_reported_length(tvb);
|
|
guint32 frag_len;
|
|
guint32 sublist_len;
|
|
int i;
|
|
while ( me ) {
|
|
if ( me->sublist ) {
|
|
if ( me->repeat_count == 0 ) {
|
|
for(sublist_len = mux_element_sublist_size( me->sublist );
|
|
offset + sublist_len <= len;
|
|
offset = dissect_mux_payload_by_me_list( tvb, pinfo, pkt_offset, pdu_tree,
|
|
call_info, me->sublist, offset, endOfMuxSdu ) );
|
|
} else {
|
|
for(i = 0; i < me->repeat_count; ++i)
|
|
offset = dissect_mux_payload_by_me_list( tvb, pinfo, pkt_offset, pdu_tree,
|
|
call_info, me->sublist, offset, endOfMuxSdu );
|
|
}
|
|
} else {
|
|
if ( me->repeat_count == 0 )
|
|
frag_len = len - offset;
|
|
else
|
|
frag_len = me->repeat_count;
|
|
if(frag_len > 0) {
|
|
tvbuff_t *next_tvb;
|
|
next_tvb = tvb_new_subset(tvb, offset, frag_len, frag_len);
|
|
dissect_mux_sdu_fragment( next_tvb, pinfo, pkt_offset + offset, pdu_tree,
|
|
call_info, me->vc, (offset+frag_len==len) && endOfMuxSdu);
|
|
offset += frag_len;
|
|
}
|
|
}
|
|
me = me->next;
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
/* dissect the payload of a MUX-PDU
|
|
*
|
|
* tvb buffer containing entire mux-pdu payload
|
|
* pinfo info on the packet containing the last fragment of the MUX-PDU
|
|
* pkt_offset offset within the block from the superdissector where the
|
|
* MUX-PDU starts (must increase monotonically for constant
|
|
* pinfo->fd->num)
|
|
* pdu_tree dissection tree for the PDU
|
|
* call_info data structure for h223 call
|
|
* mc multiplex code for this PDU
|
|
* endOfMuxSdu true if the end-of-sdu flag was set
|
|
*/
|
|
static void dissect_mux_payload( tvbuff_t *tvb, packet_info *pinfo, guint32 pkt_offset,
|
|
proto_tree *pdu_tree,
|
|
h223_call_info* call_info, guint8 mc, gboolean endOfMuxSdu )
|
|
{
|
|
guint32 len = tvb_reported_length(tvb);
|
|
|
|
h223_mux_element* me = find_h223_mux_element( &(call_info->direction_data[pinfo->p2p_dir ? 0 : 1]), mc, pinfo->fd->num, pkt_offset );
|
|
|
|
if( me ) {
|
|
dissect_mux_payload_by_me_list( tvb, pinfo, pkt_offset, pdu_tree, call_info, me, 0, endOfMuxSdu );
|
|
} else {
|
|
/* no entry found in mux-table. ignore packet and dissect as data */
|
|
proto_tree *vc_tree = NULL;
|
|
|
|
if(pdu_tree) {
|
|
proto_item *vc_item = proto_tree_add_item(pdu_tree, hf_h223_mux_deact, tvb, 0, len, FALSE);
|
|
vc_tree = proto_item_add_subtree(vc_item, ett_h223_mux_deact);
|
|
}
|
|
call_dissector(data_handle,tvb,pinfo,vc_tree);
|
|
}
|
|
}
|
|
|
|
/* dissect a reassembled mux-pdu
|
|
*
|
|
* tvb buffer containing mux-pdu, including header and closing flag
|
|
* pinfo packet info for packet containing the end of the mux-pdu
|
|
* pkt_offset offset within the block from the superdissector where the
|
|
* MUX-PDU starts (must increase monotonically for constant
|
|
* pinfo->fd->num)
|
|
* h223_tree dissection tree for h223 protocol; a single item will be added
|
|
* (with a sub-tree)
|
|
* call_info h223 info structure for this h223 call
|
|
* pdu_no index of this pdu within the call
|
|
*/
|
|
static void dissect_mux_pdu( tvbuff_t *tvb, packet_info * pinfo,
|
|
guint32 pkt_offset,
|
|
proto_tree *h223_tree,
|
|
h223_call_info *call_info)
|
|
{
|
|
guint32 offset = 0;
|
|
/* actual (as opposed to reported) payload len */
|
|
guint32 len;
|
|
guint32 raw_hdr = 0, correct_hdr = 0;
|
|
gint32 errors = 0;
|
|
guint16 closing_flag = 0;
|
|
guint8 mc = 0;
|
|
guint8 mpl = 0;
|
|
gboolean end_of_mux_sdu = FALSE;
|
|
tvbuff_t *pdu_tvb;
|
|
|
|
proto_item *pdu_item = NULL;
|
|
proto_tree *pdu_tree = NULL;
|
|
|
|
#ifdef DEBUG_H223_FRAGMENTATION
|
|
g_debug("%u: dissecting complete H.223 MUX-PDU, pkt_offset %u, len %u",
|
|
pinfo->fd->num, pkt_offset, tvb_reported_length(tvb));
|
|
#endif
|
|
|
|
switch(call_info->h223_level) {
|
|
case 0: case 1:
|
|
raw_hdr = tvb_get_guint8(tvb,0);
|
|
mc = (guint8)((raw_hdr>>1) & 0xf);
|
|
end_of_mux_sdu = raw_hdr & 1;
|
|
offset++;
|
|
/* closing flag is one byte long for h223 level 0, two for level 1 */
|
|
len = mpl = tvb_length_remaining(tvb, offset)-(call_info->h223_level+1);
|
|
|
|
/* XXX should ignore pdus with incorrect HECs */
|
|
break;
|
|
|
|
case 2:
|
|
raw_hdr = tvb_get_letoh24(tvb,0);
|
|
errors = golay_errors(raw_hdr);
|
|
offset += 3;
|
|
len = tvb_length_remaining(tvb,offset)-2;
|
|
|
|
if(errors != -1) {
|
|
correct_hdr = raw_hdr ^ (guint32)errors;
|
|
|
|
mc = (guint8)(correct_hdr & 0xf);
|
|
mpl = (guint8)((correct_hdr >> 4) & 0xff);
|
|
|
|
/* we should never have been called if there's not enough data in
|
|
* available. */
|
|
DISSECTOR_ASSERT(len >= mpl);
|
|
|
|
closing_flag = tvb_get_ntohs(tvb,offset+len);
|
|
end_of_mux_sdu = (closing_flag==(0xE14D ^ 0xFFFF));
|
|
} else {
|
|
mc = 0;
|
|
mpl = len;
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
/* XXX not implemented */
|
|
default:
|
|
len=0;
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
}
|
|
|
|
|
|
if( h223_tree ) {
|
|
if( mpl == 0 ) {
|
|
pdu_item = proto_tree_add_item (h223_tree, hf_h223_mux_stuffing_pdu, tvb, 0, -1, FALSE);
|
|
pdu_tree = proto_item_add_subtree (pdu_item, ett_h223_mux_stuffing_pdu);
|
|
} else {
|
|
pdu_item = proto_tree_add_item (h223_tree, hf_h223_mux_pdu, tvb, 0, -1, FALSE);
|
|
pdu_tree = proto_item_add_subtree (pdu_item, ett_h223_mux_pdu);
|
|
}
|
|
}
|
|
|
|
if( pdu_tree ) {
|
|
proto_item *item = proto_tree_add_item (pdu_tree, hf_h223_mux_header, tvb, 0, offset, FALSE);
|
|
proto_tree *hdr_tree = proto_item_add_subtree (item, ett_h223_mux_header);
|
|
|
|
switch(call_info->h223_level) {
|
|
case 0: case 1:
|
|
proto_tree_add_uint(hdr_tree,hf_h223_mux_mc,tvb,0,1,mc);
|
|
break;
|
|
|
|
case 2:
|
|
if( errors == -1 ) {
|
|
proto_tree_add_uint_format(hdr_tree, hf_h223_mux_rawhdr, tvb,
|
|
0, 3, raw_hdr,
|
|
"Raw value: 0x%06x (uncorrectable errors)", raw_hdr );
|
|
} else {
|
|
if( errors == 0 ) {
|
|
proto_tree_add_uint_format(hdr_tree, hf_h223_mux_rawhdr, tvb,
|
|
0, 3, raw_hdr,
|
|
"Raw value: 0x%06x (correct)", raw_hdr );
|
|
} else {
|
|
proto_tree_add_uint_format(hdr_tree, hf_h223_mux_rawhdr, tvb,
|
|
0, 3, raw_hdr,
|
|
"Raw value: 0x%06x (errors are 0x%06x)", raw_hdr, errors );
|
|
}
|
|
item = proto_tree_add_uint(hdr_tree,hf_h223_mux_correctedhdr,tvb,0,3,
|
|
correct_hdr);
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
proto_tree_add_uint(hdr_tree,hf_h223_mux_mc,tvb,0,1,mc);
|
|
proto_tree_add_uint(hdr_tree,hf_h223_mux_mpl,tvb,0,2,mpl);
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
/* XXX not implemented */
|
|
default:
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
}
|
|
}
|
|
|
|
if(mpl > 0) {
|
|
pdu_tvb = tvb_new_subset(tvb, offset, len, mpl);
|
|
if(errors != -1) {
|
|
dissect_mux_payload(pdu_tvb,pinfo,pkt_offset+offset,pdu_tree,call_info,mc,end_of_mux_sdu);
|
|
} else {
|
|
call_dissector(data_handle,pdu_tvb,pinfo,pdu_tree);
|
|
}
|
|
offset += mpl;
|
|
}
|
|
|
|
/* any extra data in the PDU, beyond that indictated by the mpl, is
|
|
dissected as data. */
|
|
len -= mpl;
|
|
if( len > 0 ) {
|
|
tvbuff_t *next_tvb = tvb_new_subset(tvb, offset, len, len);
|
|
proto_tree *vc_tree = NULL;
|
|
|
|
if( pdu_tree ) {
|
|
proto_item *vc_item = proto_tree_add_item(pdu_tree, hf_h223_mux_extra, next_tvb, 0, len, FALSE);
|
|
vc_tree = proto_item_add_subtree(vc_item, ett_h223_mux_deact);
|
|
}
|
|
call_dissector(data_handle,next_tvb,pinfo,vc_tree);
|
|
|
|
offset += len;
|
|
}
|
|
|
|
/* add the closing HDLC flag */
|
|
if( pdu_tree )
|
|
proto_tree_add_item(pdu_tree,hf_h223_mux_hdlc2,tvb,offset,2,FALSE);
|
|
}
|
|
|
|
|
|
/************************************************************************************
|
|
*
|
|
* MUX-PDU delineation and defragmentation
|
|
*/
|
|
|
|
/* attempt to parse the header of a mux pdu */
|
|
static gboolean attempt_mux_level0_header_parse(guint32 nbytes, guint32 hdr, guint32 *minlen)
|
|
{
|
|
/* level 0 isn't byte-aligned, so is a complete pain to implement */
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
nbytes = nbytes;
|
|
hdr=hdr;
|
|
minlen=minlen;
|
|
return FALSE;
|
|
}
|
|
|
|
static gboolean attempt_mux_level1_header_parse(guint32 nbytes, guint32 hdr, guint32 *minlen)
|
|
{
|
|
/* this is untested */
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
|
|
if(nbytes < 2)
|
|
return FALSE;
|
|
|
|
hdr &= 0xffff;
|
|
/* don't interpret a repeated hdlc as a header */
|
|
if(hdr == 0xE14D)
|
|
return FALSE;
|
|
|
|
/* + 1 byte of header and 2 bytes of closing HDLC */
|
|
*minlen = (guint8)((hdr >> 12) & 0xff) + 3;
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean attempt_mux_level2_3_header_parse(guint32 nbytes, guint32 hdr, guint32 *minlen)
|
|
{
|
|
gint32 errors;
|
|
|
|
if(nbytes < 3)
|
|
return FALSE;
|
|
|
|
/* + 3 bytes of header and 2 bytes of closing HDLC */
|
|
*minlen = 5;
|
|
|
|
/* bah, we get the header in the wrong order */
|
|
hdr =
|
|
((hdr & 0xFF0000) >> 16) |
|
|
(hdr & 0x00FF00) |
|
|
((hdr & 0x0000FF) << 16);
|
|
|
|
errors = golay_errors(hdr);
|
|
if(errors != -1) {
|
|
hdr ^= errors;
|
|
*minlen += ((hdr >> 4) & 0xff);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean (* const attempt_mux_header_parse[])(guint32 nbytes, guint32 header_buf, guint32 *minlen) = {
|
|
attempt_mux_level0_header_parse,
|
|
attempt_mux_level1_header_parse,
|
|
attempt_mux_level2_3_header_parse,
|
|
attempt_mux_level2_3_header_parse
|
|
};
|
|
|
|
static gboolean h223_mux_check_hdlc(int h223_level, guint32 nbytes, guint32 tail_buf)
|
|
{
|
|
guint32 masked;
|
|
|
|
switch(h223_level) {
|
|
case 0:
|
|
/* level 0 isn't byte-aligned, so is a complete pain to implement */
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
return FALSE;
|
|
break;
|
|
|
|
case 1:
|
|
masked = tail_buf & 0xffff;
|
|
return nbytes >= 2 && masked == 0xE14D;
|
|
|
|
case 2: case 3:
|
|
masked = tail_buf & 0xffff;
|
|
return nbytes >= 2 && (masked == 0xE14D || masked == (0xE14D ^ 0xFFFF));
|
|
|
|
default:
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* read a pdu (or the start of a pdu) from the tvb, and dissect it
|
|
*
|
|
* returns the number of bytes processed, or the negative of the number of
|
|
* extra bytes needed, or zero if we don't know yet
|
|
*/
|
|
|
|
static gint dissect_mux_pdu_fragment( tvbuff_t *tvb, guint32 start_offset, packet_info * pinfo,
|
|
proto_tree *h223_tree,
|
|
h223_call_info *call_info)
|
|
{
|
|
tvbuff_t *volatile next_tvb;
|
|
volatile guint32 offset = start_offset;
|
|
gboolean more_frags = TRUE;
|
|
|
|
gboolean header_parsed = FALSE;
|
|
guint32 header_buf = 0, tail_buf = 0;
|
|
guint32 pdu_minlen = 0;
|
|
|
|
|
|
#ifdef DEBUG_H223_FRAGMENTATION
|
|
g_debug("%d: dissecting H.223 PDU, start_offset %u, %u bytes left",
|
|
pinfo->fd->num,start_offset, tvb_reported_length_remaining( tvb, start_offset ));
|
|
#endif
|
|
|
|
while( more_frags && offset < tvb_reported_length( tvb )) {
|
|
guint8 byte = tvb_get_guint8(tvb, offset++);
|
|
|
|
/* read a byte into the header buf, if necessary */
|
|
if((offset-start_offset) <= 4) {
|
|
header_buf <<= 8;
|
|
header_buf |= byte;
|
|
}
|
|
|
|
/* read the byte into the tail buf */
|
|
tail_buf <<= 8;
|
|
tail_buf |= byte;
|
|
|
|
/* if we haven't parsed the header yet, attempt to do so now */
|
|
if(!header_parsed)
|
|
/* this sets current_pdu_header parsed if current_pdu_read == 3 */
|
|
header_parsed = (attempt_mux_header_parse[call_info->h223_level])
|
|
(offset-start_offset,header_buf,&pdu_minlen);
|
|
|
|
/* if we have successfully parsed the header, we have sufficient data,
|
|
* and we have found the closing hdlc, we are done here */
|
|
if(header_parsed && (offset-start_offset) >= pdu_minlen) {
|
|
if(h223_mux_check_hdlc(call_info->h223_level,offset-start_offset,tail_buf)) {
|
|
more_frags = FALSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if( more_frags ) {
|
|
if(pdu_minlen <= (offset-start_offset)) {
|
|
/* we haven't found the closing hdlc yet, but we don't know how
|
|
* much more we need */
|
|
#ifdef DEBUG_H223_FRAGMENTATION
|
|
g_debug("\tBailing, requesting more bytes");
|
|
#endif
|
|
return 0;
|
|
} else {
|
|
guint32 needed = pdu_minlen-(offset-start_offset);
|
|
#ifdef DEBUG_H223_FRAGMENTATION
|
|
g_debug("\tBailing, requesting %i-%i=%u more bytes", pdu_minlen,(offset-start_offset),needed);
|
|
#endif
|
|
return - (gint) needed;
|
|
}
|
|
}
|
|
|
|
/* create a tvb for the fragment */
|
|
next_tvb = tvb_new_subset(tvb, start_offset, offset-start_offset,
|
|
offset-start_offset);
|
|
|
|
|
|
/* we catch boundserrors on the pdu so that errors on an
|
|
* individual pdu don't screw up the whole of the rest of the
|
|
* stream */
|
|
TRY {
|
|
dissect_mux_pdu( next_tvb, pinfo, start_offset, h223_tree, call_info);
|
|
}
|
|
|
|
CATCH2(BoundsError,ReportedBoundsError) {
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_str(pinfo->cinfo, COL_INFO,
|
|
"[Malformed Packet]");
|
|
proto_tree_add_protocol_format(h223_tree, proto_malformed,
|
|
tvb, 0, 0, "[Malformed Packet: %s]", pinfo->current_proto);
|
|
}
|
|
|
|
ENDTRY;
|
|
|
|
return (offset-start_offset);
|
|
}
|
|
|
|
/************************************************************************************
|
|
*
|
|
* main dissector entry points
|
|
*/
|
|
|
|
/* dissects PDUs from the tvb
|
|
*
|
|
* Updates desegment_offset and desegment_len if the end of the data didn't
|
|
* line up with the end of a pdu.
|
|
*/
|
|
static void dissect_h223 (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
|
|
{
|
|
proto_tree *h223_tree = NULL;
|
|
proto_item *h223_item = NULL;
|
|
h223_call_info *call_info = NULL;
|
|
guint32 offset = 0;
|
|
|
|
/* set up the protocol and info fields in the summary pane */
|
|
if (check_col (pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str (pinfo->cinfo, COL_PROTOCOL, PROTO_TAG_H223);
|
|
|
|
if (check_col (pinfo->cinfo, COL_INFO))
|
|
col_clear (pinfo->cinfo, COL_INFO);
|
|
|
|
/* find or create the call_info for this call */
|
|
call_info = find_or_create_call_info(pinfo);
|
|
|
|
/* add the 'h223' tree to the main tree */
|
|
if (tree) {
|
|
h223_item = proto_tree_add_item (tree, proto_h223, tvb, 0, -1, FALSE);
|
|
h223_tree = proto_item_add_subtree (h223_item, ett_h223);
|
|
}
|
|
|
|
while( offset < tvb_reported_length( tvb )) {
|
|
int res = dissect_mux_pdu_fragment( tvb, offset, pinfo,
|
|
h223_tree, call_info);
|
|
if(res <= 0) {
|
|
/* the end of the tvb held the start of a PDU */
|
|
pinfo->desegment_offset = offset;
|
|
|
|
/* if res != 0, we actually know how much more data we need for a
|
|
* PDU.
|
|
*
|
|
* However, if we return that, it means that we get called twice
|
|
* for the next packet; this makes it hard to tell how far throught
|
|
* the stream we are and we have to start messing about with
|
|
* getting the seqno from the superdissector's private data. So we
|
|
* don't do that.
|
|
*
|
|
* pinfo->desegment_len = (res == 0 ? DESEGMENT_ONE_MORE_SEGMENT : -res);
|
|
*/
|
|
pinfo -> desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
|
|
|
|
if(h223_item) {
|
|
/* shrink the h223 protocol item such that it only includes the
|
|
* bits we dissected */
|
|
proto_item_set_len(h223_item,offset);
|
|
}
|
|
|
|
if(offset == 0) {
|
|
if(check_col (pinfo->cinfo, COL_INFO))
|
|
col_set_str (pinfo->cinfo, COL_INFO, "(No complete PDUs)");
|
|
}
|
|
return;
|
|
}
|
|
offset += res;
|
|
}
|
|
}
|
|
|
|
/* H.223 specifies that the least-significant bit is transmitted first;
|
|
* however this is at odds with IAX which transmits bytes with the
|
|
* first-received bit as the MSB.
|
|
*
|
|
* This dissector swaps the ordering of the bits in each byte before using the
|
|
* normal entry point.
|
|
*/
|
|
static void dissect_h223_bitswapped (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
|
|
{
|
|
tvbuff_t *reversed_tvb;
|
|
guint8 *data;
|
|
guint len;
|
|
guint i;
|
|
|
|
len = tvb_length(tvb);
|
|
data = g_malloc(len);
|
|
for( i=0; i<len; i++)
|
|
data[i]=BIT_SWAP(tvb_get_guint8(tvb,i));
|
|
|
|
reversed_tvb = tvb_new_real_data(data,len,tvb_reported_length(tvb));
|
|
|
|
/*
|
|
* Add the reversed tvbuff to the list of tvbuffs to which
|
|
* the tvbuff we were handed refers, so it'll get
|
|
* cleaned up when that tvbuff is cleaned up.
|
|
*/
|
|
tvb_set_child_real_data_tvbuff(tvb, reversed_tvb);
|
|
|
|
/* Add a freer */
|
|
tvb_set_free_cb(reversed_tvb, g_free);
|
|
|
|
/* Add the reversed data to the data source list. */
|
|
add_new_data_source(pinfo, reversed_tvb, "Bit-swapped H.223 frame" );
|
|
|
|
dissect_h223(reversed_tvb,pinfo,tree);
|
|
}
|
|
|
|
/******************************************************************************/
|
|
|
|
static void h223_init_protocol (void)
|
|
{
|
|
circuit_chain_init();
|
|
}
|
|
|
|
|
|
void proto_register_h223 (void)
|
|
{
|
|
/* A header field is something you can search/filter on.
|
|
*
|
|
* We create a structure to register our fields. It consists of an
|
|
* array of hf_register_info structures, each of which are of the format
|
|
* {&(field id), {name, abbrev, type, display, strings, bitmask, blurb, HFILL}}.
|
|
*/
|
|
|
|
static hf_register_info hf[] = {
|
|
{ &hf_h223_non_h223_data,
|
|
{ "Non-H.223 data", "h223.non-h223", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"Initial data in stream, not a PDU", HFILL }},
|
|
|
|
{ &hf_h223_mux_stuffing_pdu,
|
|
{ "H.223 stuffing PDU", "h223.mux.stuffing", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"Empty PDU used for stuffing when no data available", HFILL }},
|
|
|
|
{ &hf_h223_mux_pdu,
|
|
{ "H.223 MUX-PDU", "h223.mux", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"H.223 MUX-PDU", HFILL }},
|
|
|
|
{ &hf_h223_mux_header,
|
|
{ "Header", "h223.mux.header", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"H.223 MUX header", HFILL }},
|
|
|
|
{ &hf_h223_mux_rawhdr,
|
|
{ "Raw value", "h223.mux.rawhdr", FT_UINT24, BASE_HEX, NULL, 0x0,
|
|
"Raw header bytes", HFILL }},
|
|
|
|
{ &hf_h223_mux_correctedhdr,
|
|
{ "Corrected value", "h223.mux.correctedhdr", FT_UINT24, BASE_HEX, NULL, 0x0,
|
|
"Corrected header bytes", HFILL }},
|
|
|
|
{ &hf_h223_mux_mc,
|
|
{ "Multiplex Code", "h223.mux.mc", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"H.223 MUX multiplex code", HFILL }},
|
|
|
|
{ &hf_h223_mux_mpl,
|
|
{ "Multiplex Payload Length", "h223.mux.mpl", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"H.223 MUX multiplex Payload Length", HFILL }},
|
|
|
|
{ &hf_h223_mux_deact,
|
|
{ "Deactivated multiplex table entry", "h223.mux.deactivated", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"mpl refers to an entry in the multiplex table which is not active", HFILL }},
|
|
|
|
{ &hf_h223_mux_vc,
|
|
{ "H.223 virtual circuit", "h223.mux.vc", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"H.223 Virtual Circuit", HFILL }},
|
|
|
|
{ &hf_h223_mux_extra,
|
|
{ "Extraneous data", "h223.mux.extra", FT_NONE, BASE_DEC, NULL, 0x0,
|
|
"data beyond mpl", HFILL }},
|
|
|
|
{ &hf_h223_mux_hdlc2,
|
|
{ "HDLC flag", "h223.mux.hdlc", FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"framing flag", HFILL }},
|
|
|
|
/* fields for h.223-mux fragments */
|
|
{ &hf_h223_mux_fragment_overlap,
|
|
{ "Fragment overlap", "h223.mux.fragment.overlap", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Fragment overlaps with other fragments", HFILL }},
|
|
|
|
{ &hf_h223_mux_fragment_overlap_conflict,
|
|
{ "Conflicting data in fragment overlap", "h223.mux.fragment.overlap.conflict", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Overlapping fragments contained conflicting data", HFILL }},
|
|
|
|
{ &hf_h223_mux_fragment_multiple_tails,
|
|
{ "Multiple tail fragments found", "h223.mux.fragment.multipletails", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Several tails were found when defragmenting the packet", HFILL }},
|
|
|
|
{ &hf_h223_mux_fragment_too_long_fragment,
|
|
{ "Fragment too long", "h223.mux.fragment.toolongfragment", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Fragment contained data past end of packet", HFILL }},
|
|
|
|
{ &hf_h223_mux_fragment_error,
|
|
{ "Defragmentation error", "h223.mux.fragment.error", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"Defragmentation error due to illegal fragments", HFILL }},
|
|
|
|
{ &hf_h223_mux_fragment,
|
|
{ "H.223 MUX-PDU Fragment", "h223.mux.fragment", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"H.223 MUX-PDU Fragment", HFILL }},
|
|
|
|
{ &hf_h223_mux_fragments,
|
|
{ "H.223 MUX-PDU Fragments", "h223.mux.fragments", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"H.223 MUX-PDU Fragments", HFILL }},
|
|
|
|
{ &hf_h223_mux_reassembled_in,
|
|
{ "MUX-PDU fragment, reassembled in frame", "h223.mux.reassembled_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"This H.223 MUX-PDU packet is reassembled in this frame", HFILL }},
|
|
|
|
/* fields for h.223-al fragments */
|
|
{ &hf_h223_al_fragment_overlap,
|
|
{ "Fragment overlap", "h223.al.fragment.overlap", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Fragment overlaps with other fragments", HFILL }},
|
|
|
|
{ &hf_h223_al_fragment_overlap_conflict,
|
|
{ "Conflicting data in fragment overlap", "h223.al.fragment.overlap.conflict", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Overlapping fragments contained conflicting data", HFILL }},
|
|
|
|
{ &hf_h223_al_fragment_multiple_tails,
|
|
{ "Multiple tail fragments found", "h223.al.fragment.multipletails", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Several tails were found when defragmenting the packet", HFILL }},
|
|
|
|
{ &hf_h223_al_fragment_too_long_fragment,
|
|
{ "Fragment too long", "h223.al.fragment.toolongfragment", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Fragment contained data past end of packet", HFILL }},
|
|
|
|
{ &hf_h223_al_fragment_error,
|
|
{ "Defragmentation error", "h223.al.fragment.error", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"Defragmentation error due to illegal fragments", HFILL }},
|
|
|
|
{ &hf_h223_al_fragment,
|
|
{ "H.223 AL-PDU Fragment", "h223.al.fragment", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"H.223 AL-PDU Fragment", HFILL }},
|
|
|
|
{ &hf_h223_al_fragments,
|
|
{ "H.223 AL-PDU Fragments", "h223.al.fragments", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"H.223 AL-PDU Fragments", HFILL }},
|
|
|
|
{ &hf_h223_al_reassembled_in,
|
|
{ "AL-PDU fragment, reassembled in frame", "h223.al.reassembled_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"This H.223 AL-PDU packet is reassembled in this frame", HFILL }},
|
|
|
|
/* h223-als */
|
|
|
|
{ &hf_h223_al1,
|
|
{ "H.223 AL1", "h223.al1", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"H.223 AL-PDU using AL1", HFILL }},
|
|
|
|
{ &hf_h223_al1_framed,
|
|
{ "H.223 AL1 framing", "h223.al1.framed", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_h223_al2,
|
|
{ "H.223 AL2", "h223.al2", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"H.223 AL-PDU using AL2", HFILL }},
|
|
|
|
{ &hf_h223_al2_sequenced,
|
|
{ "H.223 sequenced AL2", "h223.sequenced_al2", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"H.223 AL-PDU using AL2 with sequence numbers", HFILL }},
|
|
|
|
{ &hf_h223_al2_unsequenced,
|
|
{ "H.223 unsequenced AL2", "h223.unsequenced_al2", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"H.223 AL-PDU using AL2 without sequence numbers", HFILL }},
|
|
|
|
{ &hf_h223_al2_seqno,
|
|
{ "Sequence Number", "h223.al2.seqno", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"H.223 AL2 sequence number", HFILL }},
|
|
|
|
{ &hf_h223_al2_crc,
|
|
{ "CRC", "h223.al2.crc", FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
"CRC", HFILL }},
|
|
|
|
{ &hf_h223_al2_crc_bad,
|
|
{ "Bad CRC","h223.al2.crc_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_h223_al_payload,
|
|
{ "H.223 AL Payload", "h223.al.payload", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"H.223 AL-PDU Payload", HFILL }},
|
|
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_h223,
|
|
&ett_h223_non_h223_data,
|
|
&ett_h223_mux_stuffing_pdu,
|
|
&ett_h223_mux_pdu,
|
|
&ett_h223_mux_header,
|
|
&ett_h223_mux_deact,
|
|
&ett_h223_mux_vc,
|
|
&ett_h223_mux_extra,
|
|
&ett_h223_mux_fragments,
|
|
&ett_h223_mux_fragment,
|
|
&ett_h223_al_fragments,
|
|
&ett_h223_al_fragment,
|
|
&ett_h223_al1,
|
|
&ett_h223_al2,
|
|
&ett_h223_al_payload
|
|
};
|
|
|
|
if (proto_h223 == -1) { /* execute protocol initialization only once */
|
|
proto_h223 =
|
|
proto_register_protocol ("ITU-T Recommendation H.223", "H.223", "h223");
|
|
proto_h223_bitswapped =
|
|
proto_register_protocol ("Bitswapped ITU-T Recommendation H.223", "H.223 (Bitswapped)", "h223_bitswapped");
|
|
|
|
proto_register_field_array (proto_h223, hf, array_length (hf));
|
|
proto_register_subtree_array (ett, array_length (ett));
|
|
register_dissector("h223", dissect_h223, proto_h223);
|
|
register_dissector("h223_bitswapped", dissect_h223_bitswapped, proto_h223_bitswapped);
|
|
|
|
/* register our init routine to be called at the start of a capture,
|
|
to clear out our hash tables etc */
|
|
register_init_routine(&h223_init_protocol);
|
|
}
|
|
|
|
h245_set_h223_set_mc_handle( &h223_set_mc );
|
|
h245_set_h223_add_lc_handle( &h223_add_lc );
|
|
}
|
|
|
|
void proto_reg_handoff_h223(void)
|
|
{
|
|
dissector_handle_t h223_bitswapped = find_dissector("h223_bitswapped");
|
|
dissector_handle_t h223 = find_dissector("h223");
|
|
data_handle = find_dissector("data");
|
|
h245dg_handle = find_dissector("h245dg");
|
|
srp_handle = find_dissector("srp");
|
|
|
|
dissector_add_handle("tcp.port", h223);
|
|
dissector_add_handle("tcp.port", h223_bitswapped);
|
|
dissector_add_string("rtp_dyn_payload_type","CLEARMODE", h223_bitswapped);
|
|
dissector_add("iax2.dataformat", AST_DATAFORMAT_H223_H245, h223_bitswapped);
|
|
}
|
|
/* vim:set ts=8 et: */
|