forked from osmocom/wireshark
4e1b5ea866
Change-Id: I1a317b19d8076588c9305dae6287bb80cc14da64 Reviewed-on: https://code.wireshark.org/review/4494 Petri-Dish: Stig Bjørlykke <stig@bjorlykke.org> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Michael Mann <mmann78@netscape.net> Reviewed-by: Stig Bjørlykke <stig@bjorlykke.org> Tested-by: Stig Bjørlykke <stig@bjorlykke.org>
252 lines
5.7 KiB
C
252 lines
5.7 KiB
C
/* c-basic-offset: 2; tab-width: 2; indent-tabs-mode: t
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* vi: set shiftwidth=2 tabstop=2 noexpandtab:
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* :indentSize=2:tabSize=2:noTabs=false:
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*/
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/* packet-atn-cm.c
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* By Mathias Guettler <guettler@web.de>
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* Copyright 2013
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*
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* Routines for ATN context management protocol packet disassembly.
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* ATN context management allows an aircraft
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* to log on to a ground facility.
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* details see:
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* http://en.wikipedia.org/wiki/CPDLC
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* http://members.optusnet.com.au/~cjr/introduction.htm
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* standards:
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* http://legacy.icao.int/anb/panels/acp/repository.cfm
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* note:
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* We are dealing with ATN/CPDLC aka ICAO Doc 9705 Ed2 here
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* (CPDLC may also be transmitted via ACARS/AOA aka "FANS-1/A ").
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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 <glib.h>
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#include <epan/packet.h>
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#include <epan/exceptions.h>
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#include <epan/conversation.h>
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#include <epan/dissectors/packet-ber.h>
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#include <epan/dissectors/packet-per.h>
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#include "packet-atn-ulcs.h"
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#define ATN_CM_PROTO "ICAO Doc9705 CM"
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void proto_register_atn_cm(void);
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void proto_reg_handoff_atn_cm(void);
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#include "packet-atn-cm-hf.c"
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#include "packet-atn-cm-ett.c"
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static gint ett_atn_cm = -1;
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#include "packet-atn-cm-fn.c"
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static int proto_atn_cm = -1;
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static int
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dissect_atn_cm(
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tvbuff_t *tvb,
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packet_info *pinfo,
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proto_tree *tree,
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void *data _U_)
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{
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int type;
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proto_tree *sub_tree;
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sub_tree = proto_tree_add_subtree(
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tree, tvb, 0, -1, ett_atn_cm, NULL, ATN_CM_PROTO);
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/* ti = proto_tree_add_item(tree, proto_atn_cm, tvb, 0, 0 , ENC_NA); */
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/* sub_tree = proto_item_add_subtree(ti, ett_atn_cm_pdu); */
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/* determine whether it is uplink or downlink */
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type = check_heur_msg_type(pinfo);
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switch(type){
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case um:
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dissect_CMGroundMessage_PDU(
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tvb,
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pinfo,
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sub_tree, NULL);
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break;
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case dm:
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dissect_CMAircraftMessage_PDU(
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tvb,
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pinfo,
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sub_tree, NULL);
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break;
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default:
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break;
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}
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return tvb_reported_length_remaining(tvb, 0);
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}
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static gboolean
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dissect_atn_cm_heur(
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tvbuff_t *tvb,
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packet_info *pinfo,
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proto_tree *tree,
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void *data _U_)
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{
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atn_conversation_t *atn_cv = NULL;
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volatile gboolean is_atn_cm = FALSE;
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int type;
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/* determine whether it is uplink or downlink */
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type = check_heur_msg_type(pinfo);
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/* heuristically decode message */
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switch(type){
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case um:
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TRY {
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dissect_CMGroundMessage_PDU(
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tvb,
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pinfo,
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NULL, NULL);
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/* no exception thrown: looks like it is a CM PDU */
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is_atn_cm = TRUE; }
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CATCH_ALL {
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is_atn_cm = FALSE; }
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ENDTRY;
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break;
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case dm:
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TRY {
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dissect_CMAircraftMessage_PDU(
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tvb,
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pinfo,
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NULL, NULL);
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/* no exception thrown: looks like it is a CM PDU */
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is_atn_cm = TRUE;}
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CATCH_ALL {
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is_atn_cm = FALSE; }
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ENDTRY;
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break;
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default:
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break;
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}
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if (is_atn_cm == TRUE) {
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/* note: */
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/* all subsequent PDU's belonging to this conversation are considered CM */
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/* if the first CM PDU has been decoded succesfully */
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/* (This is done in "atn-ulcs" by using "call_dissector_with_data()") */
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/* DT: dstref present, srcref is always zero */
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if((pinfo->clnp_dstref) &&
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(!pinfo->clnp_srcref)){
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atn_cv = find_atn_conversation(
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&pinfo->dst,
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pinfo->clnp_dstref,
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&pinfo->src );
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}
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/* CR: srcref present, dstref is always zero */
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if((!pinfo->clnp_dstref) &&
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(pinfo->clnp_srcref)){
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atn_cv = find_atn_conversation(
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&pinfo->src,
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pinfo->clnp_srcref,
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&pinfo->dst );
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}
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/* CC: srcref and dstref present */
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if((pinfo->clnp_dstref) &&
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(pinfo->clnp_srcref)){
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atn_cv = find_atn_conversation(
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&pinfo->src,
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pinfo->clnp_srcref,
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&pinfo->dst );
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}
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if(atn_cv){
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atn_cv->ae_qualifier = cma;
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}
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dissect_atn_cm(
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tvb,
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pinfo,
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tree,
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NULL);
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}
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return is_atn_cm;
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}
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void proto_register_atn_cm (void)
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{
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static hf_register_info hf_atn_cm[] = {
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#include "packet-atn-cm-hfarr.c"
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};
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static gint *ett[] = {
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#include "packet-atn-cm-ettarr.c"
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&ett_atn_cm
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};
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/* register CM application */
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proto_atn_cm = proto_register_protocol(
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ATN_CM_PROTO ,
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"ATN-CM",
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"atn-cm");
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proto_register_field_array(
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proto_atn_cm,
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hf_atn_cm,
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array_length(hf_atn_cm));
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proto_register_subtree_array(
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ett,
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array_length(ett));
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new_register_dissector(
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"atn-cm",
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dissect_atn_cm,
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proto_atn_cm);
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}
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void proto_reg_handoff_atn_cm(void)
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{
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/* add session dissector to subdissector list*/
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heur_dissector_add(
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"atn-ulcs",
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dissect_atn_cm_heur,
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proto_atn_cm);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 2
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* tab-width: 2
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=2 tabstop=2 noexpandtab:
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* :indentSize=2:tabSize=2:noTabs=false:
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*/
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